Abstract: A radio opaque denture base formed of a copolymer of an ethylenically unsaturated monomer containing chemically bound tin together with at least one ethylenically unsaturated monomer, the ethylenically unsaturated monomer containing chemically bound tin being an ester of trialkyl tin and an ethylenically unsaturated acid such as tributyl tin ethacrylate. In a preferred embodiment the copolymer is a novel copolymer derived from two ethylenically unsaturated tin containing monomers one of which is trimethyl tin methacrylate and the other is a trialkyl tin methacrylate other than trimethyl tin methacrylate. In another preferred embodiment the copolymer is a novel copolymer derived from an ester of trialkyl tin and an ethylenically unsaturated carboxylic acid together with two or more other ethylenically unsaturated monomers, one of which is a long chain alkyl acrylate or methacrylate and another of which is a lower alkyl acrylate or methacrylate.

Abstract: A dental syringe has a hand held unit coupled to a control unit and formed with air and water control apertures. An air pressure regulator is included in the control unit. The control unit has an air control fluid gate whose inputs are connected to the regulator and the air control aperture and whose output controls the supply of air to a nozzle. The control unit also has a water control fluid gate whose inputs are connected to the regulator and the water control aperture and whose output controls the supply of water to the nozzle.