The objective of this study was to verify the stability of Y2O3 partially stabilized zirconia (zirconia) sintered at 1,350℃ and 1,450℃ in a simulated oral environment over a long period of time. After sintering, zirconia was immersed in physiological saline, 1% lactic acid solution, and 1% malic acid solution which can be produced in the oral cavity for 3 or 6 months. The bending strength and strain were measured. The following results were obtained. Before immersion, there was no difference in the bending strength of zirconia sintered at 1,350℃ and 1,450℃. For zirconia sintered at 1,350℃, there was no difference among solutions in the bending strength after exposure. However, for zirconia sintered at 1,450℃, the bending strength and strain were lower after exposure to 1% lactic acid solution for 3 months. There was no effect on the strain after exposure to any solutions for zirconia sintered at 1,350℃. For zirconia sintered at 1,350℃, fracture was not observed during exposure to any of the solutions. However, when sintered at 1,450℃, zirconia was fractured during exposure to 1% lactic acid solution and 1% malic acid solution for 6 months. It was clarified that zirconia sintered at 1,350℃ was more suitable than that sintered at 1,450℃ as an implant material.
雑誌名
松本歯学
雑誌名(英)
Journal of the Matsumoto Dental University Society
イットリア部分安定化ジルコニアの焼成温度と曲げ強さの関係
本文
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