Abstract: An improved dental composition which is opaque to X-rays comprising a polymerizable matrix and inorganic filler. The inorganic filler are formed of particles of zeolitic alumino-silicate of at least one metal selected from the group consisting of calcium, strontium, barium, lanthanum, rare earth metal having an atomic number of 58-71, tantalum and hafnium. The invention also provides dental prosthetic appliances found from said dental compositions.

Abstract: Polymerizable hydrox-group-containing diesters of acrylic acids for dental material are prepared by reacting 3-(3,4-epoxycyclohexyl)-8,9-epoxy-2,4-dioxaspiro(5,5) undecane or a bis-epoxide of formula (A) ##STR1## or a bis-epoxide of formula (B) ##STR2## with a hydroxyalkylacrylate or hydroxyalkylmethacrylate containing 2 to 10 carbon atoms in the alkyl portion, n being 0 or 1 in formula (A) with the proviso that whenn in 0, X is --O-- and R.sup.1 is --H; and whenn is 1, X is selected from the group of alkylene with 1 to 10 carbon atoms, C.sub.1-3 -alkyl substituted alkylene with 1 to 10 carbon atoms, --O--(CH.sub.2).sub.m --O-- where m is 1 to 10, --CH.sub.2 --OCO--(CH.sub.2).sub.p --COO--CH.sub.2 where p is 1 to 6, and --CH.sub.2 --OCO--, and R.sup.1 is --H or --CH.sub.3,and in formula (B) ##STR3## OR TRICYCLO-[5,2,1,0.sup.2,6 ]-DECYLENE.

Abstract: A bone cement composition includes, as the principal component, powdered copolymers of methyl methacrylate and methyl acrylate, or monomeric methyl methacrylate, and, in addition, gentamicin hydrochloride and/or gentamicin hydrobromide, or a mixture of gentamicin sulfate with sodium chloride, potassium chloride, sodium bromide and/or potassium bromide. The bone cement composition is used, for example, for cementing implants in place, for the anchoring of endoprostheses of the joints, in the treatment of skull defects, and for carrying out spinal fusions. The composition provides for antibiotic release in higher concentrations to prevent infections.

Abstract: The present invention provides prosthetic dental appliances which contain at least one outer surface portion which includes an outer surface of the appliance which is adapted to be polished and which is highly abrasion resistant. Said shaped body portion is a hardened matrix material containing amorphous silicic acid filler particles of a maximum particle size of about 0.07 micrometer. Preferably, at least 30% of the body portion comprises the filler particles. The polymeric matrix is preferably a hardened organic resin. The invention also includes the hardenable material comprising a hardenable matrix having filler paticles dispersed therein which is used to produce the hardened prosthetic dental appliances.

Abstract: Polymerizable hydroxy-group-containing diesters of acrylic acids for dental material are prepared by reacting 3-(3,4-epoxycyclohexyl)-8,9-epoxy-2,4-dioxaspiro(5,5) undecane or a bis-epoxide of formula (A) ##STR1## or a bis-epoxide of formula (B) ##STR2## with a hydroxyalkylacrylate or hydroxyalkylmethacrylate containing 2 to 10 carbon atoms in the alkyl portion, n being 0 or 1 in formula (A) with the proviso that whenn is 0,X is --0-- andR.sup.1 is --H; and whenn is 1,X is selected from the group of alkylene with 1 to 10 carbon atoms, C.sub.1-3 -alkyl substituted alkylene with 1 to 10 carbon atoms, --O--(CH.sub.2).sub.m --O-- where m is 1 to 10, --CH.sub.2 --OCO--(CH.sub.2).sub.p --COO--CH.sub.2 where p is 1 to 6, and --CH.sub.2 --OCO--, andR.sup.1 is --H or --CH.sub.3,and in formula (B) ##STR3## or tricyclo-[5.2.1.0.sup.2,6 ]-decylene.