Ni-Cr-Mo Alloy for Dental Prostheses with Low Melting Temperature

Abstract

Ni-Cr alloys are popular for dental prostheses for the reason of economy and few better characteristics in comparison to expensive gold based alloys. However, Ni-Cr alloy developed locally has higher melting point around 1400°C as compared to that of proprietary alloys. The Ni-Cr alloys contain major alloying elements in following range: 50-80 % Ni, 10-30 % Cr, 3-10 % Mo. Minor addition is made to have requisite properties suitable for dental prostheses. In this work investigation was carried out to find out optimum chemistry to have melting point of the alloy in the range of 1100-1200°C without compromising the requisite mechanical properties. Developed alloy was characterized using Scanning Electron Microscope, Inductive Coupled Spark Plasma, Hardness Tester and Differential Scanning Calorimetry. Results were analyzed and acceptable samples tested at dental labs for trial use and suitability for dental prostheses.

Mechanical Characteristics of Boron and Cerium Added NiCrMo Non-Precious Dental Casting Alloys

“…15) In developing nations, due to low cost, Ni-based dental alloys are well-liked for dental restorations. 16) Nickel can dissolve Cr and Mo and forms solid solution in the NiCrMo alloys. However, there are some disadvantages of nickel namely; i) cannot be used with nickel sensitive patients, ii) alloys may not cast well, iii) produce more oxides while melting, and iv) polishing is difficult.…”

Characterization of NiCrMo Dental Restoration Alloy

“…Properties required for dental materials include biocompatibility, mechanical, thermal and optical characteristics. While selecting a pertinent material for dental restoration, following properties are considered: strength, hardness, resistance to oxidation, biocompatibility, bonding with porcelain, ease of fabrication and casting to the desired shape [2]. A variety of metals and alloys are in use for dental prostheses, however, each with its own merits and demerits.…”