Development of Dental Alloys for Fusion with Porcelain Containing No or Only Small Amounts of Noble Metal

摘要

In dentistry gold rich noble metal alloys are used. The fusion of porcelain with these alloys yields esthetic dental restorations of good performance. Base metal alloy, which serve the same purpose, usually contain toxic elements such as Ni and/or Be. It was the aim of the present work to develop alloys for fusion with porcelain, which are Ni- and Be-free and contain no or only small amounts of noble metal. Furthermore the Thermal expansion of these alloys had to be adjusted to that of the porcelain and the moulding shrinkage of the alloys had to be compensated by the mould. Alloys, based on Co, Fe, Cr, Pd partially with further alloying additions were investigated in terms of melting range, coefficient of thermal expansion, hardness, strength, compatibility with dental porcelain, fit and corrosion behavior. These investigations led to the development of alloys which meet almost all requirements. Besides Co, Cr, Mo, B, Ce these alloys also contain Pd. Thus, these are Ni- and Be-free but not completely free of noble metals.