지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
논문 기본 정보
- 자료유형
- 학위논문
- 저자정보
- 발행연도
- 2014
- 저작권
- 경상대학교 논문은 저작권에 의해 보호받습니다.
이용수9
이 논문의 연구 히스토리 (2)
- 이 논문의 후속연구가 궁금하신가요?
- 연관 학술논문 또는 학술발표를 통해 보다 발전된 연구결과를 확인하실 수 있습니다.
- 이 논문의 연구 히스토리 확인하기
초록· 키워드
오류제보하기
Generally, dental technicians clinically decide the sintering temperature of zirconia artificial teeth to mach the color of the teeth. However, the sintering temperature influence the microstructure and mechanical strength of ceramic body. In this study, to evaluate the free choice of sintering temperature lead to the problem of zirconia false teeth, the variation of microstructure, mechanical strength, and colortone of zirconia ceramics according to the change of sintering temperature were investigated.
Bar type specimens were prepared from commercial zirconia block by cutting and polishing into 0.8㎝(L) × 1.0㎝(W) × 4.8㎝(H). Specimens were fired from 1,400 to 1,700℃ at 50℃ intervals and hold for 1hour at highest temperature. Apparent porosity, water absorption, firing shrinkage, bulk density, bend strength, whiteness were tested. Microstructures were observed by SEM.
When fired above 1450℃, all specimens showed 0% of apparent porosity and water absorption, 20% of firing shrinkage, and 6.1g/㎤ bulk density regardless of firing temperatures. SEM photomicrographs showed grain growth of zirconia occurred above 1,600℃. Whiteness was also largely changed above this temperature. Maximum bend strength of 1,050MPa was obtained fired at 1,550℃. Bend strength slightly lowed above this temperature and showed 950MPa at 1,700℃.
In order to fit the colortone of zirconia artificial tooth, arbitrary choice of higher firing temperature than 1,500℃ was not influenced on the mechanical strength up to 1,700℃.
Bar type specimens were prepared from commercial zirconia block by cutting and polishing into 0.8㎝(L) × 1.0㎝(W) × 4.8㎝(H). Specimens were fired from 1,400 to 1,700℃ at 50℃ intervals and hold for 1hour at highest temperature. Apparent porosity, water absorption, firing shrinkage, bulk density, bend strength, whiteness were tested. Microstructures were observed by SEM.
When fired above 1450℃, all specimens showed 0% of apparent porosity and water absorption, 20% of firing shrinkage, and 6.1g/㎤ bulk density regardless of firing temperatures. SEM photomicrographs showed grain growth of zirconia occurred above 1,600℃. Whiteness was also largely changed above this temperature. Maximum bend strength of 1,050MPa was obtained fired at 1,550℃. Bend strength slightly lowed above this temperature and showed 950MPa at 1,700℃.
In order to fit the colortone of zirconia artificial tooth, arbitrary choice of higher firing temperature than 1,500℃ was not influenced on the mechanical strength up to 1,700℃.
목차
제 1 장 서 론 1제 2 장 이론적 배경 31. 치과용 지르코니아의 발전 32. 치과용 지르코니아의 결정구조 5제 3 장 연구방법 71. 시편제조 71) 시편 성형 82) 시편 소성 92. 시험항목 101) 치과용 지르코니아 소결체의 평가 102) 꺽임 강도 113) SEM 관찰 124) 백색도 측정 12제 4 장 결 과 131. 흡수율, 기공률, 선수축률 132. 비중 143. 백색조 측정 154. 꺾임강도 165. SEM 관찰 17제 5 장 고 찰 18제 6 장 결 론 20참고문헌 21
최근 본 자료
댓글(0)
0