Abstract: A dental implant system to provide a mechanically self-sufficient artificial tooth possessing a functional pseudo peridontal ligament that does not cause resorption of the supporting bone and ultimate loss is disclosed. The implant includes a core component that withstands the masticatory load and transmits such load to the root system. The root system comprises an outer component that adheres to the jawbone and possesses a similar modulus of elasticity thus capable of transmitting masticatory stresses along its interface with the bone without excessive stress concentrations and an intermediate component adhering tightly to both the core component and the outer component and having a much lower modulus of elasticity than either the core component and the outer component.

Abstract: An alloy composition for dental use containing, by weight, aluminum 0-3.0%, cobalt 0-20.0%, chromium 10.0-20.0%, manganese 0-1.5%, molybdenum 6.0-18.0%, nickel 58.5-77.0% and silicon 0-2.0%. The alloy retains the corrosion resistance properties found in nickel-chromium base alloys while having reduced yield strength typical of gold alloys thereby resulting in greater ease of grinding, polishing and manipulation. The alloy finds use as a porcelain substrate alloy and also as a crown and bridge or partial denture alloy.

Abstract: A highly ductile cobalt-chromium-nickel dental alloy suited for crown and bridge applications which require deformation by hand burnishing in the mouth of a patient, has a controlled high stacking fault energy and a ductility of about 20 percent elongation or more, a yield strength of about 35,000 psi or less and low work hardening characteristics and is free of hardening precipitates resulting from the inclusion of significant amounts of carbon, boron, molybdenum, titanium, aluminum, and tungsten in the alloy. Preferably, the nickel-cobalt ratio in the alloy base ranges from a low of about 1:3, by weight, to prevent the normal transformation of cobalt from a ductile face centered cubic lattice to a hexagonal close pack structure upon cooling to room temperature to a high of 2:1 since higher concentrations of nickel produce CoNi.sub.3.