Study of resin-bonded calcia investment: part 2. Effect of titanium content on the dimensional change of the investment.
In the present study, titanium powder was chosen as an expanding agent of an experimentally prepared resin-bonded calcia investment. The effect of Ti content on the dimensional change was investigated. In addition, the effects of the heating rate and heating temperature on the dimensional change of the investment were investigated during setting and after heating. The expansion increased with Ti content and the highest expansion (1.57%+/-0.58) was obtained at 10 mass% Ti. The highest expansion was obtained at 900 degrees C for 30 min heating and was independent of the heating rate. These findings mean that the titanium powder in the calcia investment oxidized sufficiently at that heating condition. It was found that the developed resin-bonded calcia investment was able to compensate for casting shrinkage of pure titanium by adding some Ti powder to the investment.
Nakai
Akira
A
Department of Dental Materials Science, School of Dentistry at Niigata, The Nippon Dental University Niigata City, Japan.
D000465:Algorithms; D001585:Benzoyl Peroxide / Q000737:chemistry; D017610:Calcium Compounds / Q000737:chemistry*; D002124:Calcium Fluoride / Q000737:chemistry; D003734:Dental Casting Investment / Q000737:chemistry*; D003735:Dental Casting Technique; D006358:Hot Temperature; D006801:Humans; D008422:Materials Testing; D016877:Oxidants / Q000737:chemistry; D010084:Oxidation-Reduction; D010087:Oxides / Q000737:chemistry*; D019904:Polymethyl Methacrylate / Q000737:chemistry*; D013499:Surface Properties; D013818:Thermogravimetry; D013997:Time Factors; D014025:Titanium / Q000737:chemistry*
D017610:Calcium Compounds; D003734:Dental Casting Investment; D016877:Oxidants; D010087:Oxides; D019904:Polymethyl Methacrylate; C016538:lime; D014025:Titanium; D002124:Calcium Fluoride; D001585:Benzoyl Peroxide