[Studies on newly improved gallium alloy as dental restorative material, by addition of SiC whisker and titanium powder].
Studies on new gallium alloy using liquid alloy of Ga-Sn-In which was stable at room temperature and with Ag-Sn-Cu-Pd-Zn alloy as powder, were undertaken. Two kinds of gallium alloy by addition of SiC whisker and titanium powder were made on an experimental basis for the purpose of improving the property of this alloy (reinforced alloy). Physical properties such as compressive strength, diametral tensile strength, dimensional change and chemical properties such as discoloration, corrosion, quantitative analysis by Inductively Coupled Plasma were measured. Furthermore breakage surface of alloy after tensile test was observed with SEM. The effect of adding SiC whisker and titanium powder to gallium alloy was discussed and the conclusions were as follows; 1) Compressive strength: Initial strength decreased due to addition of SiC whisker and titanium powder. However, it showed a tendency to increase as time elapsed. It approached the same degree of compressive strength after 7 days. 2) Diametral tensile strength: The best results were obtained by addition of 1% SiC whisker to gallium alloy and the optimum trituration time was 13 seconds in this study. 3) Dimensional change: Expansion in the dimensional change was observed in all testing groups which was slightly over the limitation of ISO and ADA No.1 specification. 4) Discoloration: In the case with addition of titanium powder to gallium alloy, an improvement of discoloration was manifested in artificial saliva and 1% NaS, especially prominent in the former. The favorable results were obtained by addition of 10% titanium powder to gallium alloy for discoloration tolerance. 5) Corrosion: The corrosion was low in four kinds of test immersion liquid. The best results were obtained by addition of 10% titanium powder to gallium alloy. 6) Quantitative analysis by Inductively Coupled Plasma: The examined amount of Zn dissolved out from core composition was decreased due to addition of titanium powder. An improvement of amount in dissolution of Ga, Sn and In from matrix was recognized. 7) In physical and chemical experiment's results, it was judged that the addition of 0.5-0.7% SiC whisker and 5-10% titanium powder was useful.
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D003300:Copper; D003343:Corrosion; D003722:Dental Alloys / Q000737:chemistry*; D005708:Gallium; D007204:Indium; D008422:Materials Testing; D010165:Palladium; D012825:Silicon; D013718:Tensile Strength; D014001:Tin; D014025:Titanium; D015032:Zinc
D003722:Dental Alloys; D007204:Indium; D010165:Palladium; D014001:Tin; D003300:Copper; D005708:Gallium; D014025:Titanium; D015032:Zinc; D012825:Silicon