Abstract: The invention provides a method for the manufacture of a dental restoration including the steps of forming a model of refractory material of a tooth, and forming, by flame spraying directly on to said refractory model, a base layer of predetermined thickness of said restoration, said refractory model being cooled during the formation of said base layer. The refractory model is subjected to burn out, and optionally hardening heat treatment, and one or more layers of dental porcelain are applied to the base layer following sintering of said base layer.

Abstract: The invention provides a method for the manufacture of a dental restoration including the steps of forming a model of refractory material of a tooth, and forming, by flame spraying directly on to said refractory model, a base layer of predetermined thickness of said restoration, said refractory model being cooled during the formation of said base layer. The refractory model is subjected to burn out, and optionally hardening heat treatment, and one or more layers of dental porcelain are applied to the base layer following sintering of said base layer.

Abstract: The invention provides a refractory material for use in the manufacture of dental restorations, the refractory material comprising essentially of an admixture of Silica, Silicon Carbide, Magnesium Oxide, Mono Ammonium Phosphate, and Zircon or Aluminium Oxide in predetermined proportions by weight. The material is formed as an homogenous powder and mixed with a colloidal silica based solution to form a creamy mixture suitable for casting into a silicone based impression of a prepared tooth so as to form a refractory model of said tooth. The homogenous powder may be stored in moisture resistant material until required to be mixed with said colloidal silica based solution.

Abstract: A composition which represents a new class of unleaded transparent vitreous ceramic which is described as an `Advanced or Combined Intermediate-Oxide Alkali Borosilicate. The composition comprises in combination a specially developed alkali borosilicate and a major addition selected from combinations of the group of traditionally accepted opacifiers, consisting of Zirconium, Tin, and Titanium, the said elements being present in said combination in amounts 0.5 to 43.9 wt % in terms of the Oxide form. The major addition will consist of at least two of said elements. The composition may include minor additions (.ltoreq.10 wt %) of any other element or elements which do not cause loss of transparency.