Abstract: A modelling liquid used for building up dental porcelain, comprising:(A) a photopolymerizable compound having at least one ethylenically unsaturated double bond,(B) a photopolymerization initiator,(C) a reducing agent, and(D) a polymerization inhibitor.

Abstract: A light-polymerizable resin composition for the preparation of clasp patterns comprises (a) a light-polymerizable compound having at least one ethylenically unsaturated double bond, (b) an organic filler material, (c) a light polymerization initiator and (d) a reducing agent. The light-polymerizable compound is solid at normal temperature, and may be a mono- or polyfunctional acrylate or methacrylate.

Abstract: An artificial tooth comprised of an enamel segment, a composite material of a resin matrix composed mainly of a polymerizable compound with a urethane bond and at least two ethylenically unsaturated double bonds, optionally with a polymerizable compound with at least two ethylenically unsaturated double bonds; and a dentinal segment, a composite material of polymethylmethacrylate, methylmethacrylate, one or more of a polymerizable compound with a urethane bond and at least two ethylenically unsaturated double bonds, one or more of a polymerizable compound with at least two ethylenically unsaturated double bonds, one or more of a polymerizable compound with a phenyl group and at least two ethylenically unsaturated double bonds, and one or more of a polymerizable compound with a urethane bond, a phenyl group, and at least two ethylenically unsaturated double bonds.

Abstract: A dental photopolymerizable type resin composition is provided, which comprises (a) a photopolymerizable compound that has therein at least one ethylenically unsaturated double bond and is a solid either crystalline or amorphous at 40.degree. C. or lower, (b) an inorganic filler, (c) a photopolymerization initiator, and (d) a reducing agent. That compound may be a mono- or poly-functional (meth)acrylate.

Abstract: A pallet for handling water-permeable dental porcelain materials comprises a porous ceramic material formed of one or two or more selected from the group consisting of materials based on alumina, aluminium silicate, mullite, cordierite, zirconia and vitreous china and having a grain size of 1.0 to 30.0 .mu.m and a mean grain size of 1.5 to 25.0 .mu.m. The porous ceramic material having fine and even pores uniformly dispersed therethrough, as expressed in terms of a porosity of 15 to 65% and a mean pore size of 0.5 to 10 .mu.m.

Abstract: An artificial tooth for molars is of a double structure comprising an occlusal region replaceable by a material which is more durable than a synthetic resin and is selected from the group consisting of a metal, a ceramic, a composite resin and an amalgam, and a bottom region. The present artificial tooth may further include a junction region having a maximum thickness of 0.05 to 3.0 mm, which serves to make a bond between the occlusal and bottom regions of the artificial tooth.

Abstract: An artificial tooth has a basal plane in which an areal ratio of a labial or buccal subplane to a lingual subplane is in a range of 10:1 to 1:10, and an angle that both subplanes make with a dental axis, i.e., an angle of retention, assumes a concave shape and is in a range equal to or larger than 45.degree. to less than 180.degree.. A retaining hole can be provided in the basal plane of the artificial tooth so as to further improve its performance.

Abstract: An artificial tooth for anterior teeth portions including a concave hollow extending from a basal segment to a lingual incisal segment and located in a substantially central segment, wherein: a percentage of the major diameter of the hollow to the full length is in a range of 10% to 100%, a maximum depth of the hollow is in a range of 0.5 mm to 5.0 mm and a minimum thickness of a cervical segment is in a range of 0.1 mm to 5.0 mm, and a width and length of the cervical segment being defined in terms of a percentage of the cervical minimum mesiodistal length to the maximum mediodistal length being in a range of 50% to 100% and a percentage of the cervical major diameter to the full major diameter being in a range of 10% to 50%.

Abstract: In curing dental resins, polymerizable compounds having at least one ethylenically unsaturated double bond, such as mono- or poly-functional acrylates or methacrylates are polymerized in the presence of N-cyclohexy-5-ethylpyrimidinetrione, a specific organometallic compound typically including acetylacetone copper or lithium acetate, and an organohalogen compound. The amounts of the ethylpyrimidinetrione, organometallic and organohalogen compounds used are respectively 0.1 to 10 parts by weight, 0.001 to 0.2 parts by weight and 0.1 to 5 parts by weight with respect to the polymerization compounds.

Abstract: A measuring tool for the selection of artificial teeth includes a substrate on which at least the full-scale mesiodistal highest position of contour of artificial teeth is indicated with the product classification mark thereof. The substrate is provided on the predetermined positions with a scale for determining the average condyle head at an interval of 13 mm and a scale for judging an angle that the occlusal surface makes with the interalveolar ridge line.

Abstract: An artificial tooth has a length of its buccal side substantially equal to that of a natural tooth and a length of its lingual side in the range of 4.0 mm to a length shorter than the length of its buccal side by at least 2.5 mm. A basal surface is of a concave shape in engagement with a more convex shape than the shape in cross-section of the alveolar ridge. One or two proximal surfaces of the basal surface is or are provided at the substantial center with an occlusally inclined smooth groove having a width of 1.5 to 5.0 mm, a maximum depth of 0.5 to 3.0 mm, and an proximal upper end located away from the highest position. The occlusal surface has a mesiodistal length substantially equal to that of a natural tooth and a W.sub.2 /W.sub.1 ratio falling in the range of 55 to 95% of that of a natural tooth, wherein W.sub.1 is the mesiodistal length and W.sub.2 is the buccolingual length.