Abstract: The disclosed invention is directed to a method of restoring a tooth with a light cured composite which comprises utilizing a light transparent impression or matrix which constitutes a negative reproduction of the occlusal surface of the tooth. The matrix is made by contacting the tooth surface with a polymeric impression material which when cured is light transparent and flexible. The polymeric impression material is allowed to set and then is stripped away from the tooth surface. A cavity preparation is then made in the tooth surface and treated in the usual manner. A light cured composite is then injected into the cavity preparation. The previously formed matrix is then placed over the light cured composite and pressure applied to the matrix. The composite is then cured by exposure to photopolymerizing light which passes through the transparent matrix. Following light curing, the matrix is stripped away from the tooth surface leaving a restored tooth with the original occlusal anatomy reproduced.

Abstract: Disclosed is an amorphous, spherical inorganic compound having a particle size of 0.1 to 1.0 .mu.m, which comprises as main constituents (1) an oxide of at least one metal selected from the group consisting of metals of the Groups I, II, III and IV of the Periodic Table, said metal oxide being capable of combining with silicon dioxide, and (2) silica.

Abstract: A shaped polymeric composition, for surgical or dental use, can absorb liquid and thereby expand or contract in one direction, substantially without similar expansion or contraction in another direction. Embodiments of the invention are breast implants, tapered dental inserts, and tubular bodies for use as nerve approximation sheaths.

Abstract: An adhesive composition comprises 100 parts by weight of a polymerizable monomer comprising (a) 1.5 to 100 parts by weight of a compound represented by general formula I or II: ##STR1## where R.sub.1 and R.sub.1 ' each stand for hydrogen or a methyl group, R.sub.2 stands for a divalent organic residue having 4 to 40 carbon atoms, X.sub.1 and X.sub.2 each stand for --O--, --S-- or --NH--, a is 0 or 1, and R.sub.3 stands for a group of the formula ##STR2## having 6 to 40 carbon atoms, where R.sub.4 and R.sub.4 ' each stand for a hydrocarbon group having 1 to 29 carbon atoms, and optionally replaced by a halogen atom, or a hydroxyl, amino or carboxyl group, b is an integer of 0 to 3, and Z stands for --O--, --COO-- or --NH--, a plurality of R.sub.4 ' (when b is 2 or 3) being the same or different, at least one of R.sub.4 and R.sub.4 ' having at least three carbon atoms, and (b) 0 to 98.5 parts by weight of a vinyl monomer copolymerizable with the above compound; and 0.01 to 20 parts by weight of a curing agent.

Abstract: Powdered dental material of a sintered mixture of calcium aluminum fluorosilicate glass and precious metals (or alloys thereof with each other or with up to 40% non-precious metals), which may optionally contain polycarboxylic acid and/or a chelating agent and/or further powdered precious metal. The dental material can be prepared by sintering a mixture of the glass and the precious metal at a temperature greater than 600.degree. C., grinding the sintered product to a powder and admixing the optional further components. Use of the self-hardening glass ionomer cements for dental filling purposes gives fillings having excellent resistance to wear, most notably at the edges and corners in the molar region.

Abstract: An adhesive which comprises (a) 1 part by weight of a compound represented by the formula ##STR1## (where R.sub.1 and R.sub.1 ' denote H or a methyl group,X.sub.1, X.sub.1 ', X.sub.2, and X.sub.2 ' denote O, S, or NR.sub..alpha. [where R.sub..alpha. is H or a C.sub.1-6 alkyl group],m is an integer of 1 to 4,n is an integer of 0 to 4,k and k' are 0 or 1,R.sub.a is a C.sub.8-40 organic residue having a valence of (m+1), andR.sub.a ' is a C.sub.1-40 organic residue having a valence of (n+1)), and(b) 0 to 199 parts by weight of a monomer which is copolymerizable with said compound (a).This adhesive firmly adheres to hard tissues of the living body such as teeth and bones, metallic materials, organic polymeric materials, and ceramics. It keeps the high adhesive strength for a long period of time under wet conditions. This adhesive is particularly useful in dentistry.

Abstract: An adhesive which comprises (a) 1 part by weight of a polymerizable monomer represented by the formula ##STR1## (where R.sub.1 denotes H or CH.sub.3 ; R.sub.a denotes a C.sub.6-40 organic residue having a valence of m+1; X.sub.1 and X.sub.2 denote O, S, or NR' [where R' denotes H or a C.sub.1-6 hydrocarbon group], two of X.sub.1 may be different from each other when m is 2; Z denotes a halogen; and m is 1 or 2 and k is 0 or 1), and (b) 0 to 199 parts by weight of monomer which is copolymerizable with said monomer (a).This adhesive firmly adheres to hard tissues of the living body such as teeth and bones, metallic materials, organic polymeric materials, and ceramics. It keeps the high adhesive strength for a long period of time under a wet condition. This adhesive is useful particularly in dentistry.

Abstract: Novel processes for the restoration of teeth particularly posterior teeth, wherein the use of a matrix band is required, are provided employing one component, packable, actinic light curable, resin-based restorative compositions. Such methods are now capable, for the time, of employing resin-based restoratives in the posterior restoration of teeth wherein the packability of the restorative composition enable the deformation of a matrix to allow substantial restoration of the original conformation of the tooth. Packable one component actinic light curable resin-based restorative compositions are provided.

Abstract: Process for filling dental cavities with radiation curable silaneous adhesives comprising a polymerizable resin comprising at least 20% by weight of a polymerizable silane and optionally up to about 80% by weight of a polymerizable, ethylenically unsaturated material. According to a preferred embodiment, the polymerizable silane is either an acrylosilane or a vinyl silane.

Abstract: This invention provides an adhesive composition which comprises 1 part by weight of (a) a compound of the general formula: ##STR1## wherein R.sub.1 represents H, a hydrocarbon group of 1-6 carbon atoms optionally containing halogen, COOR' wherein R' represents a hydrocarbon group of 1-20 carbon atoms optionally containing halogen or halogen:R.sub.2 is as defined for R.sub.1 ;R.sub.3 represents H, a hydrocarbon group of 1-6 carbon atoms optionally containing halogen, halogen or CN;R.sub.4 represents (COX.sub.2).sub.m1 (CO).sub.m2 (ZCO).sub.m3 (Z).sub.m4 Ra wherein Ra represents an organic residue of 6-60 carbon atoms and a valency of m+n; m1, m2, m3 and m4 each represents an integer of 0-4 and satisfies m1+m2+m3+m4.ltoreq.m, X.sub.2 ; represents O, S or NRb, wherein Rb represents H or alkyl of 1-4 carbon atoms and Z represents O or S;X.sub.1 is as defined for X.sub.

Abstract: Process for restoring teeth with visible light curable compositions having improved color stability are provided. According to a preferred embodiment, visible light hardenable restorative materials are formulated from a major proportion of inorganic filler and a minor proportion of a resin component comprising a binder resin selected from the group of acrylated polyesters, acrylated polyesters reacted with an isocyanate, and hydroxyalkyl acrylic esters reacted with an isocyanate, polymerizable acrylic diluent monomer in an amount sufficient to control the viscosity of the resin component, and a photosensitizing system comprising of from about 0.05% to about 0.50% by weight of the restorative material of an alpha diketone together with an amine reducing agent. American Dental Association color stability standards are met by these compositions.

Abstract: A varnish for the formation of a coating layer on a tooth surface to protect healthy tooth surface against the erosion by an acid etching solution during tooth restoration which comprises a polymer comprising vinyl chloride and vinyl acetate as the main monomer units dissolved in a dentally acceptable solvent.

Abstract: Photopolymerizable composition, especially for dental purposes, which contains as photopolymerizable olefin compounds especially acrylic and/or methacrylic compounds as well as a ketone and an amine as activating substances. The amine has the general formula ##STR1## wherein the symbols have the following meanings: X represents cyan or halogen,R represents the group X--CH.sub.2 --CH.sub.2 -, an alkyl group of 1 to 6 carbon atoms, or a hydroxyl group of 2 to 6 carbon atoms, an acrylic, methacrylic or vinyl group, andR.sub.1 represents a substituted or unsubstituted phenyl, benzyl or styryl radical, orR and R.sub.1 together form an alkylene group of 4 to 5 carbon atoms, the amine being able to be present also in polymeric form if in the monomer R represents an acrylic, methacrylic or vinyl group and/or R.sub.1 represents the styryl radical.

Abstract: A cyclic pyrophosphate derivative having the formula ##STR1## wherein A represents a direct bond between the two phenyl rings or a divalent moiety selected from the group consisting of lower alkylene, aryl substituted lower alkylene, cycloalkylidene, sulfonyl and oxy;R.sup.1 represents alkyl, acryloyloxy lower alkyl or methacryloyloxy lower alkyl in which the lower alkyl can be substituted with halogen; andR.sup.2 represents independently hydrogen, halogen, lower alkyl or lower alkoxy;a method of preparing the same, a dental filling material comprising the same and a method of filling dental cavities are disclosed.

Abstract: A solid fatty polyamide dissolved in a volatile organic solvent has been found effective for preparing cavities of teeth for restoration. For example, when this solution is applied to a cavity in the form of a dental cavity varnish, the organic solvent may be evaporated to leave behind a continuous polyamide film which is compatible with methacrylate resin type restoratives. Solid fatty polyamides are generally derived from the reaction product of partially polymerized unsaturated fatty acids with aliphatic diamines. The present invention relates to methods for preparing cavities with these polyamides as well as to compositions containing these polyamides.

Abstract: A novel setting composition for dental purposes comprises a dental silver amalgam alloy composed mainly of silver and tin, and including one or more of copper, zinc, indium, palladium and gold; mercury in an amount sufficient to amalgamate said alloy: and selenium. The selenium may or may not be coated with a metal showing an affinity for mercury, such as silver. The amount of selenium contained is in a range of 0.005 to 5% by weight.

Abstract: Polymerizable adducts of diisocyanates and methacryloyl alkyl ethers, alkoxybenzenes, or alkoxycycloalkanes are disclosed. The compounds of the present invention are formed into compositions which are useful as bone cement, fillings for cavities, and orthodontic adhesives. The compositions have improved mechanical properties, low water absorption, and excellent color and discoloration stability, coupled with a high filler content.

Abstract: This invention relates to a novel method for preparing dental restorations and the product, thereof, in which a relatively hard alloy is utilized for casting a crown or inlay and a softer, more malleable alloy in particulate form is positioned in the mold prior to the casting operation in the marginal areas of the restoration to provide better adaptation to the gingival margins and/or to the tooth structure.

Abstract: A family of polyfunctional surface-active comonomers which act to improve the adhesion between a resin or composite material and solid surfaces capable of binding polyvalent cations is described. These polyfunctional surface-active comonomers, or "PolySACs", are preferably the reaction product of an epoxy acrylate or methacrylate and an aminobenzoate. The adhesion of the resin or composite material to certain solid surfaces is also improved by the preparatory treatment of these surfaces with a monobasic acid of intermediate strength followed by treatment with a mordant.In its most preferred form the invention is employed in reconstructive dental work to improve the adhesion between a resin or composite material and dentin. The dentin is cleansed with isotonic formic acid, treated with an isotonic ferric chloride mordant and then treated with a PolySAC which is the reaction product of an oligomeric diglycidyl ether, acrylic acid and lithium ortho-aminobenzoate. The resin or composite material is then applied.

Abstract: An identification plate of gold alloy is inserted in a small blind hole drilled into the crown of a tooth. The hole is then filled with a durable filler which hardens around the plate to embed it in a durable, heat resistant filling. The filling material can be colored so that it is readily located when identification is desired. For making the identification, the filler is dissolved away to leave the plate, which can be read by means of optical magnification.Also disclosed is an electrical device especially adapted for providing plate blanks with the desired identifying information.