4 종류의 다른 버로 형성된 지대치에서 제작한 지르코니아 코어의 변연 및 내면 적합도 평가
Evaluation of Marginal and Internal Fitness of Zirconia Cores Fabricated on Abutments Prepared with Four Different Tip-designed Burs
오상훈, 석홍병, 노형록, 지정희, 이민호, 배태성,
소속 상세정보
오상훈 ( Oh Sang-Hoon ) - 전북대학교 대학원 치의학과
석홍병 ( Shi Hong-Bing ) - 전북대학교 대학원 치의학과
노형록 ( Noh Hyeong-Rok ) - 전북대학교 대학원 치의과학과
지정희 ( Ji Jeong-Hui ) - 전북대학교 대학원 바이오나노시스템공학과
이민호 ( Lee Min-Ho ) - 전북대학교 치의학전문대학원 치과재료학교실
배태성 ( Bae Tae-Sung ) - 전북대학교 치의학전문대학원 치과재료학교실
KMID : 1035320160430030281
Abstract
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.
키워드
Marginal fitness; Internal fitness; Zirconia core; Bur; CAD/CAM
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