A-13 高透光性ジルコニアの低温劣化と表面処理の関係(ジルコニア,一般講演(口頭発表),第61回日本歯科理工学会学術講演会)

概要

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Three kinds of high translucent dental zirconia were sandblasted, ground and polished with clinical device and materials. Tetragonal to rhombohedral transformation was observed on the ground surfaces, and monoclinic phase was detected on the sandblasted and ground surface. The polishing with diamond-containing pastes showed the smallest transformation amount of rhombohedral and monoclinic phases. After the autoclaving at 134℃, the ground and polished surface significantly inhibited the low temperature degradation. The sandblasted surface also inhibited it, although the amount of monoclinic phase was larger than that without any treatment at the starting time. The inhibition of the low temperature degradation seems to depend on the fraction of the crystal phase and the residual stress.
2013-03-25