KMID : 0362120080300020017
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Journal of Technologic Dentistry 2008 Volume.30 No. 2 p.17 ~ p.22
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A study on Thermal expansion of Inlay waxes
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Nam Sang-Yong
Kwak Dong-Ju Cha Sung-Soo
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Abstract
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The purpose of this study was to observe the thermal expansion of the inlay waxes at temperature. Inlay pattern wax shows not only a high coefficient of expansion but also a tendency to warp or distort when allowed to stand unrestrained. The thermal expansion of inlay waxes was tested according to the treatment conditions for 10 minutes at 40¡¯C. The thermal expansion of inlay waxes at various temperatures was measured with an electro dial gauge. The results were as fellows: 1. It is shown that the rate of thermal expansion of wax A is 0.2%, wax B is 0.29%, wax C is 0.38%, and wax D is 0.22% at 40¡¯C. 2. It is shown that the coefficient of thermal expansion of wax A is 106*10-6/¡¯C , wax B is , wax C is 152*10-6/¡¯C , and wax D is s116*10-6/¡¯C at 40¡¯C. 3. The thermal expansion of the inlay waxes at 40¡¯C was shown to increase in the order of wax C, B, D, A.
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KEYWORD
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Inlay wax, Thermal expansion, Coefficient of thermal expansion
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