US 2644232 A
Description (OCR text may contain errors)
July 7, 1953 v. s. ROUB'IAN 2,644,232
INSULATING AND MEDICINAL' PAD FOR DENTAL CAVIKTIES Filed March 25, 195o mvENToR wif/i s. Roya/,4N
BY i ATT NEY Patented July 7, 1953 A :fw a f t UNlTED-LS'TATES V.PA''ElVl' OFF-ICE *j l INSULATINGANn MEiiIcIAilfrAD Fon l' DENTAL CAvrrIEs e Vah S. 'Ronbian, li/I'anhasse-z, N.4 Y.;
. Application March 25, 195o, serial No. '151,395
. v l i This invention relates to an insulating and medicinal pad for dental cavities.
Dental cavities require special preparation, in order to adapt them to receive a silicate, metal or plastic lling. It is not advisable to apply the filling directly to the floor of the cavity for the reason that the tooth is very highly sensitive in that area. It is common practice, therefore, to apply a plastic substance tothe sensitive area in order to insulate the Ysame 'from' the filling. This practice requiresvthatthe plastic substance be allowed to set before the filling is introduced into the cavity. A time lapse of several minutes, hours, andveven days must accordingly be provided between the application "of the plastic insulating substance and the application of the iilling material. The disadvantages inherent in this practice are obvious but no way has heretofore been found to improve the practice, suiciently to overcome these disadvantages.
It is the principal object of this invention to provide an insulating material which may be interposed between the sensitive areas in the dental cavity,V and the temporary or permanent filling, as the case may be, andewhich will eliminate the need of a time lapse between the application of the insulating material and the application of the `filling material. More speciiically, the insulating material, which is herein described land claimed, assumes the form of a pad Vwhich may be placed directly upon the sensitive area preparatory to-immediate applicationof the filling material.. This insulatingmaterialin the form of a pad is mildly plastic' and it lends itself to being tamped down in the cavity of the tooth to assume the contours of the sensitive area in said cavity. There is no need to let this somewhat plastic pad set before filling the cavity in the usual manner. It is ready for the filling operation the moment it is tampedintovconformity with the contours'of the cavity wall. I e Y AThe insulating pad herein described and claimed may be made in many different shapes and sizes and in many different thicknesses and degrees of plasticity. Thepad may be made in small disc, oval, orrectangular shapes, ready for insertion into cavities of different shapes and sizes. On the other hand, this insulating material may be provided in long stripsf or similar shapes, to be cut by each individual dentist in accordance with the individual requirements -of 'each case. Thus a relatively large pad will be cut to the requirements. of a relativelyv large cavity, and a relatively small pad will be cut to the. requirements of.A arelatively small cavity.
Theshape of the cavity-or of the sensitive area therein will determine the shape of the pad which ily stretch-orspread. The plastic Inaterialvwith` which it is impregnated and coated -is sufliciently'plastic to assume whatever shape is required of it under the iniiuen'ce ofthe tamping instruyment.v Nonetheless, its plasticity is, controlled and coninedfbythe non-plastic base which it impregnates. In the preferred form of this invention, this plastic material is sufliciently plas- .tic under room temperature to allow it to flow in 'response tothe action of the tamping instrument.
There is no `need to apply heat or a solvent to soften it forthe' purpose under discussion.
y'The insulating" pad hereinv described and claimed is also medicated for sterilizing', seda- -tlve and I`other purposes. v It strongly resists such chemical changes and' reactions as might otherwise take' place in the dental cavity.
Preferred forms'of this invention areshown in the'acco'mpany'ing drawing in which Fig.. 1 is a vertical section taken through a tooth havingadeep cavity, showing a pad made 'in accordance'with the present inventionapplied to the sensitive area of the cavity wall and `showing a' conventional filling applied to the top `of vsaid pad.
Fig. 2 is a greatly enlarged, fragmentary' sectional view through a pad made in accordance with the present finvention'showing the com-v in accordance with the present invention.
Fig. 3A is a side edge view thereof. Fig. 4 isa plan View of pad material provided inthe form of VV'a relatively long, narrow strip. Fi g. 5 is a plan View of the same pad material showingit in the form of a relatively wide strip. Fig. 1 is a vertical section through a human molar I0. The several component parts of the tooth are designated in the drawing as follows: e The crown enamel lisidentied by means of the reference character l I, the dentin by means of the` referencejcharacter I2, the pulp and pulp cavity` by means vof the reference'character I3v and the roots by means of the reference characters I4 and I 5 respectively. As is well known, the pulp comprises a mass of nerve bers and blood vessels embedded in soft tissue and it is highly sensitive. A deep cavity such as cavity shown in the drawing causes the tooth to become extremely sensitive in the area immediately above the pulp .cavity since .there is very little dentin left to insulate the pulp in that area. vIt israccordingly necessary to provide artificial insulation to the sensitive area before the cavity 1is plugged up with filling 2|, whether that filling be of a temporary or permanent nature.`
The disc-shaped insulating pad 25 which is shown in Figs. 3 and 3A may beinsertedi-nto cavity 20 in order to serve as insulating material between what is left of the dentin-in saidzcavity and the nlling 2|. irregular in shape, it may be found desirable to insert an insulating pad; similar to pad 25, but ofA correspondingly irregular shape. But in any 4case, the pad should be sufliciently :large Vand of suitable shape to adequately cover the sensitive varea inthe cavity. The required shape and-size nia-y be cut from narrow strip A or wide strip 2 5B -which are made of the same material as pad V25. All that need be 'done to make use of the insulating pad herein claimed is to insert it into the cavity rand tamp it gently into conformity uwith the contours of the cavity in the sensitive area. Once that is done, the lling may be introduced into the cavity in the usual manner and vthe job is done.
Fig. '2 is a-greatly detailed cross-section which s'l'low's the `structure of the insulating pad very clearly. '.'It comprises a base of a Vfine 'linen 'fabric'ZB lwhich is impregnated and coated on -both sides with a plastic` insulating material 2l'. Linen as a base is much to be preferred over other materials vbut it should be understood nonethelessthat other materials such as strong paper vsheets may 'also be used to good advantage. `The plastic material may be suitable for insulating ypurposes' only, butin the'preferred form of this` invention, it` 'isalso self-sterilizing and it has .sedative and other medicinal properties. It is Ychemically .inert with respect to the tissues of y the tooth and also with respect to the filling materials.
The plastic material with which the sheet material is impregnated and coated comprises three component elements: There isfa'wax which serves as the body or base 'of thematerial vand Viticarries the other elements of the material and :also `renders and maintains the material in relatively plastic form. Secondly, there isafiller Awhich performs two important functions: it V'lends' :body -to the plastic wax and gives it strength, and it also provides the material asa 'whole with insulating properties. The third element of the plastic material is a medicinal substance which is sedative, antiseptic, and endowed with sterilizingproperties.
A preferred for-mula for this plastic material is fthe following: Y
Percent by volume Beeswax approximately 87 Eugenol approximately A4 .Zinc-oxide approximately 9 Eugen'ol '(4-allyl-2-methoxyphenol) is obtained from clove oil and it is used in dentistry as an antiseptic and as-a local anesthetic. It is a 3phenolic'derivative. Another phenol, thymol'll- Cil If the cavity happens to rbe Yti'city :to the material.
lating nller. /Minerals-fsuchi as asbestos and calcium carbonate may be used as substitutes for vthe zinc oxide. The beeswax and its substitutes constitute the rst element of the formula, namelyzthe wax body' or base which lends plas- Animal waxes such as spermacetirvegetable waxes such as japan wax, and mineral waxes such as parafn wax may be :used ras. substitutesfor the beeswax.
The broad range of the proportions of the materials above set forth which may be utilized in connection with the present invention is as Beeswax (or substitutes) approx. to`90% by volume Engenol (or substitutes) approx. 4 of 1% to 15% by vvolume -Zmc ox1de (orsubstltutes) --.approx. 5% to 60%.by volume The'foregoing is descriptive of preferred forms of this invention and it will bey understood that these'forms may vbe modified in many ways and other forms may be added, all within the broad scope and spirit. of this invention.
For thefpurposes of claims, the following terminology will lbe used: The base of the insulating pad herein above described will be described in theclaims as being made of sheet material. The material nwith which .said sheet Vmaterial is irnpregnated 'and coated will be described in the claims as plastic material.
l. An insulating pad for dental cavities comprising a Iflat base whichgisv made `of sheet material and which is impregnated with a plastic material consisting of a plastic body, an insulat-ing liller, and a medicinal substance.
`2. An insulatingrpad for dental cavities comjprising a lilat base which is made of a sheet 'of y *fabric material impregnated 'and coated with ,a
plastic Vmaterial consisting of 'a wax body, amineral insulating ller, and a phenolic medicinal felement.
An insulating pad for dental cavities Acome prising la sheet of fabric material which is impregnated and coated with a plastic. substance 'consisting lof a wax body, a zinc-oxide insulating filler, 'and 'eugenol as a medicinal component thereof.
-4. -An' insulating pad `for ydental cavities'com- Apri-sing a sheet'of fabric material which Ais impregnated and 'coated with av plastic material "consisting -of a wax body approximately 50% to by volume, a, zinc oxide insulating filler approximately 5% `to 60% by volume, and eugenol as amedicinal component, 1A; of 1% to 15% by volume. p f
5. An insulating `pad for dental cavities comy`-prisingf-alinen'fabric-base which is impregnated with plastic material consisting of a phenolic wax base anda mineral insulating ller.
'6. vAn insulating padjfor dental cavities 'comprising a linen fabric base which Vis `impregnated with plastic material consisting of a phenolic wax base'and ller of zinc oxide vas an insulatin component.
'7. An `insulating pad for Idental cavities cornlprising a linen fabric base which is impregnated and-coated with'a plastic material consistingof beeswax, approximately 87% by Volume, eugenol, approximately 4% by volume, and Zinc oxide, approximately 9% by volume.
8. A large insulating pad for dental cavities which may be cut to the individual sizes and shapes of a plurality of dental cavities, comprising a sheet of fabric material which is impregnated and coated on both sides with a plastic material consisting of a Wax body, a mineral insulating filler, and a phenolic medicinal substance.
9. An insulating pad in accordance with claim 8, wherein zinc-oxide is the insulating filler and eugenol is the phenolic medicinal substance.
VAH S. ROUBIAN.
References cited in the me of this 'patent UNITED STATES PATENTS Number