オールセラミック修復装置の熱的性質 : セラミック・レジンセメント接着積層体について [in Japanese] A Study on Thermal Properties of All Ceramic Restorations : Double Laminated Specimens of Ceramic and Resin Cement [in Japanese]
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The present study was conducted to investigate thermal properties of double laminated specimens made from All ceramic (IPS Empress, IVOCLAR) and resin cement (Variolink II, VIVADENT). The specimens were IPS Empress 1.0mm, Variolink II 0.05mm (ER50), IPS Empress 1.0 mm, Variolink II 0.10mm (ER 100), IPS Empress 1.0mm, and Variolink II 0.20mm (ER 200). Thermal properties were measured by TC-2000 L (Shinku-riko) with a xenon flash as the light source to clarify the changes of thermal properties with the difference in thickness of Variolink II (measured value). Then the thermal conductivity of ER 50, ER 100, and ER 200 was calculated for IPS Empress and Variolink II (calculated value), and thermal conductivity of all ceramic restoratives (IPS Empress 1.00 mm, Variolink II 0.05mm, IPS Empress 1.00mm, Variolink II 0.10mm, IPS Empress 1.00mm, and Variolink II 0.20mm) and human tooth (enamel 0.75, dentin 0.30, 0.35, and 0.45mm), which was eliminated by preparation of an abutment tooth, was also calculated and then examined.<BR>The measured value of thermal conductivity (W/mK) was 0.603 for ER 50, 0.577 for ER 100, and 0.540 for ER 200. Variolink II was thicker, and thermal conductivity of all ceramic restoratives was less. Calculated values of thermal conductivity (W/mK) ranged from 0.748 to 0.698, and those of tooth substance 0.808 to 0.779. Accordingly, the rate of decrease between measured value and calculated value was 21.0%. Therefore, thermal conductivity of all ceramic restoratives was less than that of tooth substance which was eliminated by preparation of an abutment tooth.
- Nihon Hotetsu Shika Gakkai Zasshi
Nihon Hotetsu Shika Gakkai Zasshi 44(3), 426-432, 2000-06-10
Japan Prosthodontic Society