http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : 석홍병(Hong-Bing Shi) (검색결과 2 건)
- 무료
- 기관 내 무료
- 유료
-
4 종류의 다른 버로 형성된 지대치에서 제작한 지르코니아 코어의 변연 및 내면 적합도 평가
오상훈(Sang-Hoon Oh),석홍병(Hong-Bing Shi),노형록(Hyeong-Rok Noh),지정희(Jeong-Hui Ji),이민호(Min-Ho Lee),배태성(Tae-Sung Bae) 대한치과재료학회 2016 대한치과재료학회지 Vol.43 No.3
Marginal shape of abutment is one of the factors to effect on the fitness of zirconia crown. The aim of this study was to help clinicians set up specific guidelines on preparation for CAD/CAM zirconia crown by evaluation of marginal and internal fitness of CAD/CAM zirconia core using abutment model reflecting tip design of diamond burs to be used in a dental clinic. 4 groups consisting of 10 specimens of abutment made of photo-polymerized resin(RC 31;EnvisionTEC;Germany) were fabricated with 3D printer(Ultra 2, EnvisionTEC, Germany). The margin shape of each group’s abutment is designed to reflect 4 types of tip design of diamond burs(torpedo bur, deep chamfer bur, sloped shoulder bur, shoulder bur) to be used in a dental clinic. And then, zirconia cores for abutments of 4 groups were fabricated by same technician with same CAD/CAM system. 5 zirconia cores of each group were adapted on the abutment without cement, and 5 zirconia cores were cemented on abutment with ZPC. After embedding the specimens in resin, we observed marginal and internal fitness on the cross-section of the resin block by recording 200~500 fold magnification. When experiments without cement, the measured value of the gap in the margin, internal line angle and occlusal surface of torpedo group and deep chamfer group were smaller than sloped shoulder nd shoulder group. All result of ZPC cemented groups showed larger values than non-cemented group, especially shoulder group. Torpedo and deep chamfer bur are clinically acceptable for CAD/CAM zirconia crown. However, sloped shoulder and shoulder bur showed relatively large gap in the finish line and occlusal surface, having large variations within the group.
-
TiO₂ 나노튜브를 형성한 Ti-6Al-4V 합금의 석회화 순환처리가 생체활성도에 미치는 영향
송재주(Jae-Joo Song),한아름(A-Lum HAN),정세진(Se-Jin Jung),석홍병(Hong-Bing Shi),변선미(Seon-Mi Byeon),임청하(Chung-Ha Lim) 대한치과재료학회 2016 대한치과재료학회지 Vol.43 No.3
The purpose of this study was to evaluate the effect of calcium phosphate treatment on the bioactivity of Ti-6Al-4V alloy modified by anodic oxidation, pre-calcification treatment, and heat treatment. Anodic oxidation were performed to increase specific surface area and form nanotubular TiO₂ layer (AH). After that, pre-calcification treatment was carried out in NaH2PO4 solution and Ca(OH)₂ saturated solution for 10 cycles (APH 10) and 30 cycles (APH 30) to induce the precipitation of calcium phosphates on surface. Additionally, the specimens were heat treated for structural stability and elimination of remaining impurities. The nanotubes were shown densely on the AH group. APH 10 and 30 groups showed the precipitated calcium phosphate on the nanotubular TiO₂ layer, but the APH 30 group showed more precipitation of calcium phosphate. Additionally, APH 10 and 30 groups showed the precipitation of HAp after immersion in SBF for 3 days. Compared to the untreated group, the surface treatment groups (AH, APH 10, and APH 30) showed a significant increase in surface roughness (p < 0.05), and the APH 30 group showed the highest surface roughness. Contact angle was decreased significantly in the surface treated groups compared to the untreated group (p < 0.05), and wettability was highest in APH 30 group. Consequently, we found out that APH 30 group greatly improved bioactivity by formation of nanotubular TiO₂ layer and HAp precipitation.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
