US20020006387A1 - Methods for whitening teeth - Google Patents
Methods for whitening teeth Download PDFInfo
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- US20020006387A1 US20020006387A1 US09/864,640 US86464001A US2002006387A1 US 20020006387 A1 US20020006387 A1 US 20020006387A1 US 86464001 A US86464001 A US 86464001A US 2002006387 A1 US2002006387 A1 US 2002006387A1
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- strip
- teeth
- tooth whitening
- gms
- front surface
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C19/00—Dental auxiliary appliances
- A61C19/06—Implements for therapeutic treatment
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K8/00—Cosmetics or similar toiletry preparations
- A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
- A61K8/19—Cosmetics or similar toiletry preparations characterised by the composition containing inorganic ingredients
- A61K8/22—Peroxides; Oxygen; Ozone
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C19/00—Dental auxiliary appliances
- A61C19/06—Implements for therapeutic treatment
- A61C19/063—Medicament applicators for teeth or gums, e.g. treatment with fluorides
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C19/00—Dental auxiliary appliances
- A61C19/06—Implements for therapeutic treatment
- A61C19/063—Medicament applicators for teeth or gums, e.g. treatment with fluorides
- A61C19/066—Bleaching devices; Whitening agent applicators for teeth, e.g. trays or strips
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K6/00—Preparations for dentistry
- A61K6/30—Compositions for temporarily or permanently fixing teeth or palates, e.g. primers for dental adhesives
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K8/00—Cosmetics or similar toiletry preparations
- A61K8/02—Cosmetics or similar toiletry preparations characterised by special physical form
- A61K8/0208—Tissues; Wipes; Patches
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K8/00—Cosmetics or similar toiletry preparations
- A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
- A61K8/19—Cosmetics or similar toiletry preparations characterised by the composition containing inorganic ingredients
- A61K8/20—Halogens; Compounds thereof
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K8/00—Cosmetics or similar toiletry preparations
- A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
- A61K8/30—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds
- A61K8/40—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing nitrogen
- A61K8/42—Amides
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K8/00—Cosmetics or similar toiletry preparations
- A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
- A61K8/72—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds
- A61K8/73—Polysaccharides
- A61K8/731—Cellulose; Quaternized cellulose derivatives
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K8/00—Cosmetics or similar toiletry preparations
- A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
- A61K8/72—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds
- A61K8/81—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
- A61K8/8141—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
- A61K8/8147—Homopolymers or copolymers of acids; Metal or ammonium salts thereof, e.g. crotonic acid, (meth)acrylic acid; Compositions of derivatives of such polymers
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
- A61Q11/00—Preparations for care of the teeth, of the oral cavity or of dentures; Dentifrices, e.g. toothpastes; Mouth rinses
Abstract
Method for whitening teeth are provided. The methods include the steps of providing a strip of material and applying a thin layer of a tooth whitening substance having a whitening active selected from the group consisting of peroxides, metal chlorites, perborates, percarbonates, peroxyacids, hypochlorites, and combinations thereof to a front surface of a plurality of teeth, wherein the amount of the tooth whitening substance is between about 0.05 grams and about 0.4 grams. The method further includes the steps of conforming the strip of material to the front surface of the plurality of teeth and removing the strip of material, wherein the front surface of the plurality of teeth have between a 1 and a 4 VITA LUMIN shade guide improvement in color.
Description
- This is a continuation of application Ser. No. 09/268,185, filed Mar. 15, 1999, which is a continuation-in-part of application Ser. No. 09/040,000, filed Mar. 17, 1998, now U.S. Pat. No. 5,891,453, which is a continuation-in-part of application Ser. No. 08/870,330, filed Jun. 6, 1997, now U.S. Pat. No. 5,879,691.
- The present invention relates to methods for whitening teeth, and more particularly, to methods for whitening teeth using a strip of material and a tooth whitening substance.
- Tooth whitening has become popular in today's culture. More and more consumers are searching for the best method to achieve tooth whitening. Professional tooth bleach by a dentist is common. Generally, there are two types of professional tooth bleaching: in the dentist's office or outside of the dentist's office. In the office tooth bleaching generally involves several visits to the dentist and the use of a rubber dam to protect the patient's gums from the bleaching agents. Out of the office tooth bleaching generally involves the use of a device or tray which is made in the dental office to fit the patient's teeth. The device is reused, and therefore, must be sufficiently robust to endure repeat handling, cleaning, filling, installation, and wearing. Typically, a patient uses the device in time periods when social contact can be avoided.
- There are now non-professional programs available to persons interested in whitening their teeth using commercial products available at drug stores. The commercial products provide a kit which includes a generic appliance and a container of bleaching gel. The obvious appeal is the lower cost of the program. A major disadvantage of this generic “one size fits all” appliance is the greater void space between the interior walls of the appliance and the teeth versus a professionally fitted appliance. Hence, in order to insure intimate contact of the bleaching gel and the teeth surfaces, more bleaching gel is required. Furthermore, the poorer fit means a greater loss of bleaching gel onto the gums, into the oral cavity, and eventual ingestion. The commercial kits, an the outside-the-office professionally administered program, require the user to clean and to reuse the appliance. Since generic appliances are not fitted to the individual user, they are even more bulky in the mouth than the fitted appliances and thus they restrict social discourse to a greater degree.
- One attempt to remedy some of the problems of the commercial kits is disclosed in U.S. Pat. No. 5,575,654, issued to Fontenot on Nov. 19, 1996. Fontenot discloses a prepackaged moldable dental appliance adapted to fit a wide range of variously sized dental arches. In use, the dental appliance is removed from the packaging, aligned in a parallel fashion to the edges of the teeth and pushed over the teeth in the direction of the periodontal tissue until it covers the teeth surfaces.
- Another solution is disclosed in U.S. Pat. No. 5,310,563, issued to Curtis et al. on May 10, 1994. Curtis et al. disclose a putty-like material which is formed by pressing against the teeth. It is held in place by mechanical engagement with undercut surfaces and by friction. The composition encapsulates the active.
- Other methods are disclosed in U.S. Pat. No. 5,425,953, issued to Sintov et al. on Jun. 20, 1995. Sintov et al. discloses a liquid polymer composition for bleaching of the teeth. The liquid polymer composition forms a film after applied to the teeth. Other references which disclose using a film in the oral cavity include U.S. Pat. No. 4,713,243 issued to Schiraldi et al. on Dec. 15, 1987, and U.S. Pat. No. 2,835,628, issued to Saffir on May 20, 1958.
- A method for whitening teeth is provided. The method includes the steps of providing a strip of material and applying a thin layer of a tooth whitening substance having a whitening active selected from the group consisting of peroxides, metal chlorites, perborates, percarbonates, peroxyacids, hypochlorites, and combinations thereof to a front surface of a plurality of teeth, wherein the amount of the tooth whitening substance is between about 0.05 grams and about 0.4 grams. The method further includes the steps of conforming the strip of material to the front surface of the plurality of teeth and removing the strip of material, wherein the front surface of the plurality of teeth have between a 1 and a 4 VITA LUMIN shade guide improvement in color.
- While the specification concludes with claims which particularly point out and distinctly claim the present invention, it is believed that the present invention will be better understood from the following description of preferred embodiments, taken in conjunction with the accompanying drawings, in which like reference numerals identify identical elements and wherein:
- FIG. 1 is a planar view of a tooth whitening strip of material which is substantially trapezoidal in shape;
- FIG. 2 is a planar view of a tooth whitening strip which is substantially trapezoidal in shape with stair stepped sides;
- FIG. 3 is a planar view of a tooth whitening strip which is substantially rectangular in shape with stair stepped sides;
- FIG. 4 is a planar view of a tooth whitening strip which is substantially rectangular in shape with notched sides;
- FIG. 5 is a planar view of a tooth whitening strip which is rectangular in shape with two slits;
- FIG. 6 is a planar view of a tooth whitening strip which is rectangular in shape with two cross-slits;
- FIG. 7 is a planar view of a tooth whitening strip which is rectangular in shape with two holes;
- FIG. 8 is a cross-sectional view of a user's front six teeth; and
- FIG. 9 is cross-sectional view of a tooth whitening strip placed upon a user's front six teeth before being folded over the back sides of the user's teeth.
- The abbreviation “cm”, as used herein, means centimeter. The abbreviation “mm”, as used herein, means millimeter.
- Referring now to the drawings, and more particularly to FIG. 1, there is shown a first preferred embodiment of the present invention, which is generally indicated as 10.
Embodiment 10 represents a tooth whitening strip which is substantially trapezoidal in shape. Embodiment 10 has afirst side 11 andsecond side 12, athird side 13, and afourth side 14.First side 11 andsecond side 12 are straight sides which angle in from thefourth side 14 to thethird side 13.Third side 13 is concave and shorter then thefourth side 14. Thefourth side 14 is convex. Thefourth side 14 will be placed close to the bottom edge of the front side of a user's bottom set of front teeth. Alternatively, if the strip is worn on the user's top set of teeth, thefourth side 14 may be placed along the top part of the front side of a user's top set of front teeth. Afold line 15 ofembodiment 10 extends fromfirst side 11 tosecond side 12. Thefold line 15 may be located closer to thethird side 13 or thefourth side 14. Thefold line 15 will be determined by the size of the user's teeth and the placement of the tooth whitening strip on the user's teeth. Thethird side 13 will be along the back side of a user's teeth after thestrip 10 is folded along thefold line 15. - As shown in FIG. 2 by
embodiment 20, the tooth whitening strip of material may be substantially trapezoidal in shape with stair stepped sides.Embodiment 20 has afirst side 21, asecond side 22, athird side 23, and afourth side 24.Third side 23 is concave and shorter then thefourth side 24. Thefourth side 24 is convex.First side 21 andsecond side 22 are both stair step sides. Foldline 15 extends from thecomers first side 21 and thesecond side 22, respectively.Embodiment 20 can alternatively be described as two substantially trapezoidal shapes placed on top of one another. The top trapezoid is formed by thethird side 23, thesecond side 22 from itscomer 27 up to thethird side 23, thefold line 25, and thefirst side 21 from itscomer 26 up to thethird side 23. The bottom trapezoid is formed by thefold line 25, thesecond side 22 from itscomer 27 down to thefourth side 24, thefourth side 24, and thefirst side 21 from itscomer 26 down to thefourth side 24. - FIG. 3 illustrates an
alternative embodiment 30 of the present invention. The tooth whitening strip of material may be substantially rectangular in shape with stair stepped sides.Embodiment 30 has afirst side 31 andsecond side 32, athird side 33, and afourth side 34.First side 31 andsecond side 32 are both stair step sides. Foldline 35 extends from thecomers first side 31 and thesecond side 32, respectively.Embodiment 30 can also be described as two rectangles placed on top of one another. The top rectangle is formed by thethird side 33, thesecond side 32 from itscomer 37 up to thethird side 33, thefold line 35, and thefirst side 31 from itscomer 36 up to thethird side 33. This top rectangle may alternatively be described as a flap which fits over the back sides of the user's teeth. The bottom rectangle is formed by thefold line 35, thesecond side 32 from itscomer 37 down to thefourth side 34, thefourth side 34, and thefirst side 31 from itscomer 36 down to thefourth side 34. - The
fold line 35 will be placed over the tips of a user's teeth enabling the strip to fold down onto both the front side and the back side of the user's teeth. The strip will be placed so that the user's two canine teeth are just outside ofcomers fourth side 34 will be located close to the bottom edge of the front side of a user's bottom set of front teeth. Alternatively if the strip is worn on the user's top set of teeth, thefourth side 34 may be placed along the top part of the front side of a user's top set of front teeth. Thethird side 33 will be along the back side of a user's teeth. - FIG. 4 details a tooth whitening strip of material substantially rectangular in shape with notched sides.
Embodiment 40 has afirst side 41,second side 42, athird side 43, and afourth side 44.Third side 43 andfourth side 44 are both substantially straight sides and the same length.First side 41 andsecond side 42 havenotches line 45 extends fromnotch 46 in thefirst side 41 to notch 47 in thesecond side 42.Notches embodiment 40. - Embodiments 50, 60, and 70 are illustrated by FIGS. 5, 6, and7 respectively. The tooth whitening strip of material of embodiments 50, 60, and 70 is substantially rectangular in shape with rounded comers. Each embodiment contains two recesses which allow for protrusion of the canine teeth when the tooth whitening strip is placed on a user's teeth. FIG. 5 illustrates where the recesses are
straight slits Slits line 55 extends betweenslits holes Holes line 75 extends betweenholes - FIG. 8
shows corresponding top 81 andfront 82 view of a user's bottom set of the front six teeth.Top view 81 illustrates the general arched shape found in the front six teeth. The twocanine teeth front teeth 85. Not shown are additional back teeth, such as molars, which are located next to each of the canine teeth.Front view 82 illustrates the general shapes, including the tips, of the front fourteeth 85 andcanine teeth - FIG. 9 shows
front view 82 of a user's front six teeth shown in FIG. 8 with the tooth whitening strip illustrated byembodiment 20 of FIG. 2.Embodiment 20 is shown placed along the teeth but not yet folded over the teeth. As illustrated,fourth side 24 is placed along the bottom portions of the front fourteeth 85 and the twocanine teeth line 25 hits at the tips of the front fourteeth 85 and allows the tips of thecanine teeth Canine teeth comers Third side 23 will subsequently be folded down onto the back side of the fourfront teeth 85. - The tooth whitening strip may be called a tooth whitening strip of material, a strip of material, or a strip. The tooth whitening strip of material will have a shape that is adapted to fit a user's teeth. It is preferred that the strip substantially covers the front side of at least a user's front four teeth and two canine teeth. These teeth are the most visible teeth for most users. The strip of material may cover the front side of additional teeth such as the teeth next two the canine teeth. This may be desired if these teeth are visible to others. By substantially, it is meant that at least half of the front tooth surface is covered. The tooth whitening strip may cover all of the front tooth surface and may also cover portions of the gums adjacent to the teeth. Generally, the tooth whitening strip will begin coverage at the point where the surface of the teeth intersect the gums.
- The tooth whitening strip will be foldable over the tips and onto the back sides of one or more of the front four teeth without covering the tips of the two canine teeth. The shape of the strip will allow for canine tips to not be covered. By folding over the tips it is meant that the strip covers or wraps around the front side of the tooth over the tip and onto the back side of the tooth. Depending upon the size of the strip of material, the entire back side of the tooth including the adjacent gum may be covered or only a portion of the back side of the tooth.
- The shape of the tooth whitening strip is critical to allow for coverage of the front side of the canines by not coverage of the tips. The shape of the strip may be any shape which allows this to result. The shape of the tooth whitening strip may be of many shapes. The strip may be substantially trapezoidal in shape. The term substantially trapezoidal is used to mean any shape having four general sides where there are two sides which are generally parallel or arched the same way. This may result when one side is convex and the opposing side is concave. The arched shape may help to reduce bunching of the strip and allow the strip to lay smoother along the surfaces of the teeth. The other two opposing sides will generally not be parallel. The strip may be substantially rectangular in shape. This is used generally to mean a shape with four sides which each of two sides are close to parallel. Parallel is used broadly to include when sides are arched, not straight, and generally not perpendicular. Alternatively, the strip may be of any shape such as round or oval. The strip may also be of a shape with many numbers of sides. The shape of the strip does not need to be symmetrical.
- Any of the sides or edges of the strip may be notched, stair stepped, or arched. By notched it is meant that there is a recess, indentation, or curve of some type. By stair stepped it is meant that the side is not straight and may contain one or more stair steps. The strip may also contain slits, cross-slits, holes, perforations, or any suitable formation that allows for the canines to protrude through or be avoided by the strip of material. In generally, a recess should allow approximately 2 cm for protrusion of the canines.
- Each strip of material will contain a fold line. The fold line is defined as the part of the strip where the tips of the teeth meet the strip when the strip is folded or wrapped over the tips. This line may be from the point where one recesses, stair steps, or notch on one side extends into the strip the farthest to where the other recess, stair step, or notch extends into the strip the farthest on the opposing side. For example, at the corner of a stair step or at the point of a notch. The fold line will generally extend from one side of the strip to another parallel side and along the longer part of the strip. The fold line may be self adjusting depending upon the size and shape of the strip. With a trapezoidal shape strip, the fold line will be determined based upon the positioning of the strip on a user's teeth. The fold line is generally up to about 4 cm in length for a strip designed to fit on a user's bottom set of teeth. There is not a minimum requirement for the fold line as long as part of the strip folds over the tips of at least part of one of the front four teeth. Generally, the fold line will be from about 0.1 cm to about 4 cm, preferably from about 0.5 cm to about 3.5 cm, more preferably from about 1 cm to about 3.2 cm, and most preferably from about 2 cm to about 3.1 cm. For the top set of a user's teeth, the fold line is up to about 4.3 cm in length. The fold line is generally from about 0.1 cm to about 4.3 cm, preferably from about 0.5 cm to about 4 cm, more preferably from about 1 cm to about 3.5 cm and most preferably from about 2 cm to about 3.4 cm.
- Preferably, the shape of the strip of material is any shape that has rounded comers. “Rounded comers” is defined as not having any sharp angles or points. The conformable strip of material is preferably of a size that individually fits the row of teeth desired to be bleached. The size of the strip of material depends upon many factors, including the number of teeth to be bleached, the size of the teeth, and personal preference of the wearer. In general, the length of the strip of material is from about 2 cm to about 12 cm, preferably from about 3 cm to about 9 cm, and more preferably from about 4 cm to about 6 cm. If the strip of material is stair stepped on the sides or trapezoidal shaped, the longer side of the strip of material is generally from about 3 cm to about 12 cm, preferably from about 3.1 to about 10 cm, more preferably from about 3.5 cm to about 8 cm, and most preferably from about 4 cm to about 6 cm. The shorter side is from about 0.1 cm to about 12 cm, preferably from about 0.5 cm to about 8 cm, more preferably from about 1 cm to about 5 cm, and most preferably from about 1.5 cm to about 3 cm. The width of the strip of material will also depend upon many factors, including whether or not the strip of material wraps completely around the teeth and covers part or all of the front and back surfaces of the tooth. In a general application, the width of the strip of material is from about 0.5 cm to about 4 cm and preferably from about 1 cm to about 2 cm.
- The strip of material serves as a protective barrier to substantially prevent saliva contacting the tooth whitening substance and leaching and/or erosion of the tooth whitening substance from the surface of the teeth by the wearer's lips, tongue, and other soft tissue. In order for an active in tooth whitening substance to act upon the surface of tooth over an extended period of time, from several minutes to several hours, it is important to minimize such leaching and/or erosion. The term “act upon” is herein defined as bringing about a desired change. For example, if the substance is a tooth whitener, it bleaches color bodies to bring about whitening.
- The strip of material may comprise materials such as polymers, natural and synthetic wovens, non-wovens, foil, paper, rubber, and combinations thereof. The strip of material may be a single layer of material or a laminate of more than one layer. Generally, the strip of material is substantially water impermeable. The material may be any type of polymer that meets the required flexural rigidity and is compatible with tooth whitening actives, such as peroxide. The material may comprise a single polymer or a mixtures of polymers. Suitable polymers include, but are not limited to, polyethylene, ethylvinylacetate, ethylvinyl alcohol, polyesters such as Mylar® manufactured by DuPont, fluoroplastics such as Teflon® manufactured by DuPont, and combinations thereof. Preferably, the material is polyethylene. The strip of material is generally less than about 1 mm thick, preferably less than about 0.05 mm thick, and more preferably from about 0.001 to about 0.03 mm thick. A polyethylene strip of material is preferably less than about 0.1 mm thick and more preferably from about 0.005 to about 0.02 mm thick.
- The strip of material may contain shallow pockets. When the substance is coated on a substance-coated side of strip of material, additional substance fills shallow pockets to provide reservoirs of additional substance. Additionally, the shallow pockets help to provide a texture to the delivery system. The film will preferably have an array of shallow pockets. Generally, the shallow pockets are approximately 0.4 mm across and 0.1 mm deep. When shallow pockets are included in the strip of material and substances are applied to it in various thicknesses, the overall thickness of the delivery system is generally less than about 1 mm. Preferably, the overall thickness is less than about 0.5 mm.
- Flexural stiffness is a material property that is a function of a combination of strip thickness, width, and material modulus of elasticity. This test is a method for measuring the rigidity of polyolefin film and sheeting. It determines the resistance to flexure of a sample by using a strain gauge affixed to the end of a horizontal beam. The opposite end of the beam presses across a strip of the sample to force a portion of the strip into a vertical groove in a horizontal platform upon which the sample rests. A microammeter, wired to the strain gauge is calibrated in grams of deflection force. The rigidity of the sample is read directly from the microammeter and expressed as grams per centimeter of sample strip width. In the present invention, the strip of material has a flexural stiffness of less than about 5 grams/cm as measured on a Handle-O-Meter, model #211-300, available from Thwing-Albert Instrument Co. of Philadelphia, Pa., as per test method ASTM D2923-95. Preferably, the strip of material has a flexural stiffness less than about 4 grams/cm, more preferably less than about 3 grams/cm, and most preferably from about 0.1 grams/cm to about 1 grams/cm. Preferably, the flexural stiffness of the strip of material is substantially constant and does not significantly change during normal use. For example, the strip of material does not need to be hydrated for the strip to achieve the low flexural stiffness in the above-specified ranges.
- This relatively low stiffness enables the strip of material to drape over the contoured surfaces of teeth with very little force being exerted; that is, conformity to the curvature of the wearer's mouth and gaps between adjacent teeth is maintained because there is little residual force within strip of material to cause it to return to its substantially flat shape. The flexibility of the strip enables the strip of material to contact adjoining soft tissue over an extended period of time without physical irritation. The strip of material does not require pressure forming it against the teeth.
- The strip of material is held in place on a plurality of adjacent teeth by adhesive attachment provided by the substance. The viscosity and general tackiness of the substance cause the strip of material to be adhesively attached to a plurality of adjacent teeth without substantial slippage under the potential friction from the lips, tongue, and other soft tissue rubbing against the strip of material during mouth movements associated with talking, drinking, etc. However, this adhesion to the teeth is low enough to allow the delivery system to be easily removed by the wearer by peeling off the strip of material using one's finger or fingernail. The delivery system is easily removable from the surfaces of the teeth without the use of an instrument, a chemical solvent, or undue friction. Chemical solvents include any organic solvents commonly used in oral care products such as alcohol and other safe solvents such as water, which could be used to dilute the gelling agent. Undue friction is described as any type of rubbing with one's finger or a soft implement, such as cotton balls, swabs, or gauze pads.
- A peel force of from about 1 gram to about 50 grams for a 1.5 cm strip width (approximately 17 grams/cm) is all that is required. Preferably, the peel force is from about 5 grams to about 40 grams and more preferably from about 10 grams to about 30 grams. The low peel force is desired for consumer handling purposes. The low peel force is possible because of the non-aggressive nature of a gel substance. Only when the flexural stiffness of the strip is low can the adhesion of the substance also be low. The adhesion of a stiffer strip would have to be greater in proportion to the strip stiffness in order to prevent the strip from returning to its flat condition and pulling away from the contoured surface of a plurality of teeth.
- The strip of material may be formed by several of the film making processes known in the art. Preferably, a strip of material made of polyethylene is made by a blown process or a cast process. Processes, such as extrusion and other processes that do not affect the flexural rigidity of the strip of material, are also feasible. Additionally, the substance may be incorporated onto the strip during the processing of the strip. The substance may be a laminate on the strip.
- The tooth whitening substance is a composition, compound, or mixture capable of influencing or effecting a desired change in appearance and/or structure of the surface it contacts. Examples of appearance and structural changes include, but are not necessarily limited to, whitening, stain bleaching, stain removal, plaque removal, and tartar removal. Preferably, the active is for the whitening of the tooth surfaces.
- The tooth whitening substance may be coated on the strip of material, be applied by the user to the strip of material, or be applied by the user to their teeth and then apply the strip over the coated teeth. The amount of substance applied to the strip of material or teeth will depend upon the size and capacity of the piece of material, concentration of the active, and the desired benefit. Generally, less than about 1 gram of substance is required. Preferably, from about 0.05 grams to about 0.5 grams and more preferably from about 0.1 gram to about 0.4 grams of the substance is used. The amount of substance per square cm of material is less than about 0.2 grams/cm2, preferably from about 0.005 to about 0.1 grams/cm2, and more preferably from about 0.01 grams/cm2 to about 0.04 grams/cm2.
- The substance of the present invention can be in the form of a viscous liquid, paste, gel, solution, or other suitable form that can provide sufficient adhesion. Preferably, the substance is in the form of a gel. The substance will have a viscosity of from about 200 to about 1,000,000 cps at low shear rates (less than one 1/seconds). Preferably, the viscosity is from about 100,000 to about 800,000 cps and more preferably from about 400,000 to about 600,000 cps.
- Actives suitable for whitening include any material safe for use in the oral cavity which provides bleaching or stain removal. The actives suitable for whitening are selected from the group consisting of the peroxides, metal chlorites, perborates, percarbonates, peroxyacids, and combinations thereof. Suitable peroxide compounds include hydrogen peroxide, calcium peroxide, carbamide peroxide, and mixtures thereof. Most preferred is carbamide peroxide. Suitable metal chlorites include calcium chlorite, barium chlorite, magnesium chlorite, lithium chlorite, sodium chlorite, and potassium chlorite. Additional whitening actives may be hypochlorite and chlorine dioxide. The preferred chlorite is sodium chlorite.
- The tooth whitening active is present in an amount of from about 0.01% to about 40%, by weight of the substance. If a peroxide compound is chosen as the active, the peroxide compound should provide an amount of hydrogen peroxide equivalent of from about 0.1% to about 20%, preferably from about 0.5% to about 10%, and most preferably from about 1% to about 7%, by weight of the substance. To deliver this amount of hydrogen peroxide equivalent, the peroxide compound, such as carbamide peroxide, is generally present in an amount of from about 0.1% to about 30% and preferably from about 3% to about 20%, by weight of the substance.
- The actives are generally contained in an aqueous gel. The gel is a high viscosity matrix formed from gelling agents known in the art. These gelling agents are safe for oral use, do not readily dissolve in saliva, and do not react with or inactivate the oral care compounds incorporated into them. Generally, the gelling agent is a swellable polymer. Furthermore, the gel formed with these agents provides sufficient adhesive attachment of the film material to the targeted area of the mouth. The level of gelling agent to form the gel composition is from about 0.1% to about 15%, preferably from about 1% to about 10%, more preferably from about 2% to about 8%, and most preferably from about 4% to about 7%, by weight of the substance.
- Suitable gelling agents useful in the present invention include carboxypolymethylene, carboxymethyl cellulose, carboxypropyl cellulose, poloxamer, carrageenan, Veegum, carboxyvinyl polymers, and natural gums such as gum karaya, xanthan gum, Guar gum, gum arabic, gum tragacanth, and mixtures thereof. The preferable gelling agent for use in the present invention is carboxypolymethylene, obtained from B.F. Goodrich Company under the tradename “Carbopol”. Particularly preferable Carbopols include Carbopol 934, 940, 941, 956 and mixtures thereof. Particularly preferred is Carbopol956. Carboxypolymethylene is a slightly acidic vinyl polymer with active carboxyl groups. The normal concentration of various carboxypolymethylene resins in water, according to the manufacturer, is below about 2%. However, it has been found that by preparing supersaturated carboxypolymethylene compositions having an absolute concentration in the ranges specified above, suitable high viscosity oral gel compositions may be prepared.
- The concentrated carboxypolymethylene gels have a number of important characteristics in addition to high viscosity. Enough carboxypolymethylene is added to the oral gel compositions beyond that required to provide high viscosity such that a significant quantity of saliva or water is required to lower the viscosity to the point that the composition may be diluted and washed out by saliva. The concentrated carboxypolymethylene composition also has a unique tackiness or stickiness which retains and seals the strip material against the targeted oral cavity surface it is affixed to, particularly teeth. However, care should be taken to avoid too much carboxypolymethylene thereby making insertion or withdrawal of the strip material difficult.
- Water is also present in the gel compositions disclosed herein. The water, employed in the present invention should, preferably, be deionized and free of organic impurities. Water comprises from about 0.1% to 95%, preferably from about 5% to about 90%, and most preferably from about 10% to about 80%, by weight of the substance. This amount of water includes the free water that is added plus that amount that is introduced with other materials.
- A pH adjusting agent may also be added to optimize the storage stability of the gel and to make the substance safe for oral tissues. These pH adjusting agents, or buffers, can be any material which is suitable to adjust the pH of the substance. Suitable materials include sodium bicarbonate, sodium phosphate, sodium hydroxide, ammonium hydroxide, sodium stannate, triethanolamine, citric acid, hydrochloric acid, sodium citrate, and combinations thereof. The pH adjusting agents are added in sufficient amounts so as to adjust the pH of the gel composition to about 4.5 to about 11, preferably from about 5 to about 8.5, and more preferably from about 5.5 to about 7. pH adjusting agents are generally present in an amount of from about 0.01% to about 15% and preferably from about 0.05% to about 5%, by weight of the substance.
- While the gel described above provides sufficient adhesiveness, additional gelling agents may also be included in the formula to help the active ingredients adhere to the tissues of the oral cavity. Suitable agents include both polymers with limited water solubility as well as polymers lacking water solubility. These polymers deposit a thin film on both the oral cavity's soft and hard tissues when saliva combines with the instant composition. Suitable limited water solubility adhesives include: hydroxy ethyl or propyl cellulose. Adhesives lacking water solubility include: ethyl cellulose and polyox resins. Another possible adhesive suitable for use in the instant composition is polyvinylpyrrolidone with a molecular weight of about 50,000 to about 300,000. Still another possible adhesive suitable for use in the instant composition is a combination of Gantrez and the semisynthetic, water-soluble polymer carboxymethyl cellulose.
- An additional carrier material may also be added to the substance. Carrier materials can be humectants. Suitable humectants include glycerin, sorbitol, polyethylene glycol, propylene glycol, and other edible polyhydric alcohols. Humectants are generally present in an amount of from about 10% to about 95%, preferably from about 20% to about 80%, and more preferably from about 50% to about 70%, by weight of the substance. In addition to the above materials of the gel of the present invention, a number of other components can also be added to the substance. Additional components include, but are not limited to, flavoring agents, sweetening agents, xylitol, opacifiers, coloring agents, and chelants such as ethylenediaminetetraacetic acid. These additional ingredients can also be used in place of the compounds disclosed above.
- The release liner may be formed from any material which exhibits less affinity for substance than substance exhibits for itself and for the strip of material. The release liner preferably comprises a rigid sheet of material such as polyethylene, paper, polyester, or other material which is then coated with a non-stick type material. The release liner material may be coated with wax, silicone, polyester such as Teflon®, fluoropolymers, or other non-stick type materials. A preferred release liner is Scotchpak®, produced by 3M. The release liner may be cut to substantially the same size and shape as the strip of material or the release liner may be cut larger than the strip of material to provide a readily accessible means for separating the material from the strip. The release liner may be formed from a brittle material which cracks when the strip is flexed or from multiple pieces of material or a scored piece of material. Alternatively, the release liner may be in two overlapping pieces such as a typical adhesive strip bandage type design. A further description of materials suitable as release agents is found in Kirk-Othmer Encyclopedia of Chemical Technology, Fourth Edition,
Volume 21, pp. 207-218, incorporated herein by reference. - The strip of material is preferably a 0.009 mm thick piece of polyethylene film. The film preferably has an array of shallow pockets, typically 0.4 mm across and 0.1 mm deep. The strip of material has a flexural stiffness of about 0.6 grams/cm as measured on a Handle-O-Meter, model #211-300, available from Thwing-Albert Instrument Co. of Philadelphia, Pa., as per test method ASTM D2923-95.
- An example of a tooth whitener is a gel described as follows: Combine 70% glycerin, 5% carboxypolymethylene, 10% carbamide peroxide, and 15% water adjusted to pH 6.5 with sodium hydroxide. Mix until homogeneous.
- Additional examples of alternative tooth whitening gel are described as follows: Combine 8% carboxypolymethylene in approximately 84% water, add 4% sodium hydroxide and enough sodium bicarbonate to bring the pH to about 10. Dissolve in 3.75% sodium chlorite and mix until homogeneous.
- Combine 60% glycerin, 4.5% carboxypolymethylene, and 5% hydrogen peroxide. Add sodium hydroxide (50% solution) until the pH is adjusted as desired and then add the remainder as water. Mix until homogeneous.
-
Combine 56% glycerin, 6% carboxypolymethylene, 10% carbamide peroxide, and 24% water. Add 4% sodium hydroxide (50% solution) to adjust the pH. Mix until homogeneous. - Combine 68% glycerin, 6% carboxypolymethylene, 22% carbamide peroxide, and 4% sodium hydroxide (50% solution). Mix until homogeneous.
-
Combine 25% glycerin, 69.7% water, 2% xanthan gum, 3% carboxymethylcellulose, and 0.3% carbamide peroxide. Mix until homogeneous. -
Combine 24% poloxamer, 20% glycerin, 46% polyethylene glycol, and 10% carbamide peroxide. Mix until homogeneous. - Commercial tooth whiteners, such as Opalescence and Nu-Pro Gold, are also operable with the delivery system of the present invention.
- In practicing the present invention, a strip of material is applied by the user to the teeth. The side of the material facing the teeth is coated with a tooth whitening substance which is preferably in a viscous state to provide not only the active but also tackiness between the tooth surfaces and the strip of material to hold the strip in place for an extended period of time. Alternatively, the user may apply a tooth whitening substance to the teeth or to the strip before applying the strip to the teeth. The strip of material readily conforms to the teeth by lightly pressing it against the teeth and/or by the wearer gently sucking through the gaps between the teeth. The strip of material is easily removed by the wearer by peeling it off. Preferably, each successive treatment will use a fresh strip of material.
- The tooth surface is not required to be prepared before the delivery system is applied. For example, the wearer may or may not choose to brush his teeth or rinse his mouth before applying the delivery system. The surfaces of the teeth are not required to be dried or to be excessively wet with saliva or water before the strip of material is applied.
- Preferably, the strip of material and substances are substantially transparent so as to be almost unnoticeable when worn. Thinness of the delivery system enables the higher temperature inside of the wearer's mouth to conduct heat through the strip of material to the normally cooler teeth in order to accelerate the rate of diffusion of the active material into the surfaces of the teeth.
- Preferably, the wearer applies the delivery system of the present to the teeth continuously for about 5 minutes to about 120 minutes a day, preferably from about 30 minutes to about 60 minutes. Generally, this is done once a day for about 7 to 28 days. The amount of time and the number of days are dependent upon several factors, including the amount of bleaching desired, the wearer's teeth, and if initial or maintenance bleaching is desired. The bleaching is done to achieve a whitening benefit of 1-4 shade guide improvement as measured by VITA LUMIN® Vacuum Farbskala Shade Guides, a product of VITA Zahnfabrik, of BadSackingen, Germany.
- When the wearer removes the strip of material from the tooth, there may be a residue of substance remaining on the surface. This residual will not be great, as the tooth whitening substance has affinity for both the film and for itself. If residual substance remains, it may be easily removed by brushing or rinsing.
- While particular embodiments of the present invention have been illustrated and described, it will be obvious to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention, and it is intended to cover in the appended claims all such modifications that are within the scope of the invention.
Claims (48)
1. A method for whitening teeth, comprising the steps of:
a) providing a strip of material;
b) applying a thin layer of a tooth whitening substance having a whitening active selected from the group consisting of peroxides, metal chlorites, perborates, percarbonates, peroxyacids, hypochlorites, and combinations thereof to a front surface of a plurality of teeth, wherein the amount of said tooth whitening substance is between about 0.05 grams and about 0.4 grams;
c) conforming said strip of material to said front surface of said plurality of teeth;
d) removing said strip of material; and
wherein said front surface of said plurality of teeth have between 1 and 4 VITA LUMIN shade guide improvement in color.
2. The method of claim 1 , further comprising repeating steps a) to d) between about 7 and about 28 times.
3. The method of claim 2 , wherein said step of removing said strip of material occurs after between 5 minutes and 120 minutes.
4. The method of claim 2 , wherein said step of removing said strip of material occurs after between 30 minutes and 60 minutes.
5. The method of claim 1 , further comprising a step of applying said tooth whitening substance to said strip of material before said step of applying said layer of said tooth whitening substance to said front surface of said plurality of teeth.
6. The method of claim 1 , wherein the amount of said tooth whitening substance applied to said strip of material is between about 0.005 gms/cm2 and about 0.1 gms/cm2.
7. The method of claim 1 , further comprising the step of conforming said strip of material to soft tissue adjacent said plurality of teeth.
8. The method of claim 1 , further comprising the step of folding said strip of material between said front surface and a back surface of said plurality of teeth.
9. The method of claim 1 , wherein said strip of material has a thickness less than about 1 mm.
11. The method of claim 1 , wherein said strip of material has a thickness less than about 0.05 mm.
12. The method of claim 1 , wherein said strip of material has a thickness between about 0.001 mm and about 0.03 mm.
13. The method of claim 1 , wherein said strip of material has a flexural stiffness of less an about 5 gms/cm.
14. The method of claim 1 , wherein said strip of material has a flexural stiffness between about 0.1 gm/cm and about 1 gm/cm.
15. The method of claim 1 , wherein said strip of material is substantially flat prior to said step of conforming said strip of material to said front surface of said plurality of teeth.
16. The method of claim 1 , wherein said tooth whitening substance provides adhesive attachment between said strip of material and said front surface of said plurality of teeth.
17. The method of claim 16 , further comprising the step of removing said strip of material with a peel force between about 1 gm and about 50 gms.
18. The method of claim 16 , further comprising the step of removing said strip of material with a peel force between about 10 gms and about 40 gms.
19. The method of claim 1 , wherein said whitening active is a peroxide.
20. The method of claim 19 , wherein said tooth whitening substance further comprises water.
21. A method for whitening teeth, comprising the steps of:
a) providing a strip of material;
b) applying a layer of a tooth whitening substance having a whitening active selected from the group consisting of peroxides, metal chlorites, perborates, percarbonates, peroxyacids, hypochlorites, and combinations thereof to a front surface of a plurality of teeth, wherein the amount of said tooth whitening substance is between about 0.05 grams and about 0.4 grams;
c) conforming said strip of material to said front surface of said plurality of teeth;
d) removing said strip of material, wherein said removal occurs between 5 minutes and 120 minutes after said step of applying said layer of said tooth whitening substance;
e) repeating steps a) to d) between about 7 and about 28 times; and
wherein said portion of said front surface of said plurality of teeth have between 1 and 4 VITA LUMIN shade guide improvement in color.
22. The method of claim 21 , wherein said step of removing said strip of material occurs after between 30 minutes and 60 minutes.
23. The method of claim 21 , wherein the amount of said tooth whitening substance applied to said strip of material is between about 0.005 gms/cm2 and about 0.1 gms/cm2.
24. The method of claim 21 , further comprising the step of conforming said strip of material to soft tissue adjacent said plurality of teeth.
25. The method of claim 21 , further comprising the step of folding said strip of material between said front surface and a back surface of said plurality of teeth.
26. The method of claim 21 , wherein said strip of material has a thickness less than about 1 mm.
27. The method of claim 21 , wherein said strip of material has a thickness less than about 0.05 mm.
28. The method of claim 21 , wherein said strip of material has a thickness between about 0.001 mm and about 0.03 mm.
29. The method of claim 21 , wherein said strip of material has a flexural stiffness of less an about 5 gms/cm.
30. The method of claim 21 , wherein said strip of material has a flexural stiffness between about 0.1 gm/cm and about 1 gm/cm.
31. The method of claim 21 , further comprising a step of applying said tooth whitening substance to said strip of material before said step of applying said thin layer of said tooth whitening substance to said portion of said front surface of said plurality of teeth.
32. The method of claim 21 , wherein said tooth whitening substance provides adhesive attachment between said strip of material and said front surface of said plurality of teeth.
33. The method of claim 32 , further comprising the step of removing said strip of material with a peel force between about 1 gm and about 50 gms.
34. The method of claim 32 , further comprising the step of removing said strip of material with a peel force between about 10 gms and about 40 gms.
35. The method of claim 21 , wherein said strip of material is substantially flat prior to said step of conforming said strip of material to said front surface of said plurality of teeth.
36. The method of claim 21 , wherein said tooth whitening active is a peroxide.
37. The method of claim 36 , wherein said tooth whitening substance further comprises water.
38. A method for whitening teeth, comprising the steps of:
a) providing a substantially flat strip of material;
b) applying a layer of a tooth whitening substance having a whitening active selected from the group consisting of peroxides, metal chlorites, perborates, percarbonates, peroxyacids, hypochlorites, and combinations thereof to said strip of material, wherein the amount of said tooth whitening substance is between about 0.05 grams and about 0.5 grams;
c) conforming said strip of material to a front surface of a plurality of teeth;
d) removing said strip of material, wherein said removal occurs between 5 minutes and 120 minutes after said step of applying said layer of said tooth whitening substance and wherein said strip of material is removed with a peel force between about 1 gm and about 50 gms;
e) repeating steps a) to d) between about 7 and about 28 times; and
wherein said portion of said front surface of said plurality of teeth have between 1 and 4 VITA LUMIN shade guide improvement in color.
39. The method of claim 38 , wherein said step of removing said strip of material occurs after between 30 minutes and 60 minutes.
40. The method of claim 38 , wherein the amount of said tooth whitening substance applied to said strip of material is between about 0.005 gms/cm2 and about 0.1 gms/cm2.
41. The method of claim 38 , further comprising the step of conforming said strip of material to soft tissue adjacent said plurality of teeth.
42. The method of claim 38 , further comprising the step of folding said strip of material between said front surface and a back surface of said plurality of teeth.
43. The method of claim 38 , wherein said strip of material has a thickness less than about 0.05 mm.
44. The method of claim 38 , wherein said strip of material has a thickness between about 0.001 mm and about 0.03 mm.
45. The method of claim 38 , wherein said strip of material has a flexural stiffness of less an about 5 gms/cm.
46. The method of claim 38 , wherein said strip of material has a flexural stiffness between about 0.1 gm/cm and about 1 gm/cm.
47. The method of claim 38 , further comprising the step of removing said strip of material with a peel force between about 10 gms and about 40 gms.
48. The method of claim 38 , wherein said whitening active is a peroxide.
49. The method of claim 48 , wherein said tooth whitening substance further comprises water.
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