Abstract
The tensile strengths of several lining and luting cements, silicate cements, and dental amalgam alloys were determined by diametral compression. Two E.B.A. cements and one polyacrylate cement are stronger within 20 minutes of mixing than a zinc phosphate cement. Limiting tensile strengths for base and luting cements remain undefined. However, since these cements compare favorably with a zinc phosphate cement for tensile strength considerations, they are well suited to similar clinical uses. Silicate cements reach between 70 and 100 per cent of their ultimate strength within 6 hours. The early tensile strength of these cements is enhanced by incorporating glass fibers into them. Dental amalgam alloys are three times as strong in tension as silicate cements. The rate of increase in strength of two spherical-particle alloys is reduced between 1 and 6 hours when compared with the rate of increase in strength of a conventional alloy.
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