고압증기멸균처리가 치과용 지르코니아 세라믹의 저온열화에 주는 영향 (The effect of autoclave treatments on the low temperature degradation of dental zirconia ceramics)

서지정보

· 발행기관 : 대한치과재료학회
· 수록지 정보 : 대한치과재료학회지 / 37권 / 2호 / 95 ~ 106페이지
· 저자명 : 이태훈, 이상혁, 최재윤, 허수복, 안진수, 이상훈, 양형철, 임범순

초록

The aim of this study was to evaluate the effect of autoclave treatments on the phase transformation of dental zirconia ceramics. Four commercially available tetragonal zirconia polycrystals (Cercon Base, CRB; Lava, LAV; ZioCera, ZOC; Rainbow, RAB) and one zirconia/alumina composite (ZirAce, ZRA) were tested. Disk type (10×1 ㎜) of specimens were prepared. For grain size estimations, specimens which were thermally etched at 1500℃ for 1h, were analyzed with SEM. Specimens were autoclave treated at 130℃ for 1, 3, 5, 10, and 15hrs. The phases of specimens were identified by x-ray diffractometer before and after autoclave treatment, and the relative amount of monoclinic phase was calculated. The average grain sizes were approximately 0.43 ㎛ for CRB and ZOC, more than 0.68 ㎛ for LAV and RAB, about 5 ㎛ for ZRA. There were no significant differences in the average grain sizes before and after autoclave treatment for 15hrs. CRB, ZOC and ZRA specimens showed little phase transformation after autoclave treatment for 15hrs (<9%). LAV and RAB, however, showed remarkable phase transformation after autoclave treatment for 5hrs (>20%) and severe phase transformation after autoclave treatment for 10hrs (50%, 44%, respectively). Although LAV and RAB groups showed high monoclinic fraction by autoclave treatments, they were reverse phase transformed by annealing treatment at 1200℃ for 2hrs.

영어초록

The aim of this study was to evaluate the effect of autoclave treatments on the phase transformation of dental zirconia ceramics. Four commercially available tetragonal zirconia polycrystals (Cercon Base, CRB; Lava, LAV; ZioCera, ZOC; Rainbow, RAB) and one zirconia/alumina composite (ZirAce, ZRA) were tested. Disk type (10×1 ㎜) of specimens were prepared. For grain size estimations, specimens which were thermally etched at 1500℃ for 1h, were analyzed with SEM. Specimens were autoclave treated at 130℃ for 1, 3, 5, 10, and 15hrs. The phases of specimens were identified by x-ray diffractometer before and after autoclave treatment, and the relative amount of monoclinic phase was calculated. The average grain sizes were approximately 0.43 ㎛ for CRB and ZOC, more than 0.68 ㎛ for LAV and RAB, about 5 ㎛ for ZRA. There were no significant differences in the average grain sizes before and after autoclave treatment for 15hrs. CRB, ZOC and ZRA specimens showed little phase transformation after autoclave treatment for 15hrs (<9%). LAV and RAB, however, showed remarkable phase transformation after autoclave treatment for 5hrs (>20%) and severe phase transformation after autoclave treatment for 10hrs (50%, 44%, respectively). Although LAV and RAB groups showed high monoclinic fraction by autoclave treatments, they were reverse phase transformed by annealing treatment at 1200℃ for 2hrs.

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