不同基牙设计对CAD/CAM全瓷修复体抗折强度的影响  

Fracture resistance of endodontically treated maxillary premolars restored with different CAD/CAM all-ceramic restorations

作　　者：吕继新 于卫强[2] 佘文君 翁维民[2] LV Ji-xin;YU Wei-qiang;SHE Wen-jun;WENG Wei-min(Department of Stomatology,Hengdian Wenrong Hospital,Dongyang 322118,Zhejiang Province;Department of Prosthodontics,Shanghai Ninth People's Hospital,College of Stomatology,Shanghai Jiao Tong University School of Medicine,Shanghai 200011,China)

机构地区：[1]浙江横店文荣医院口腔科,浙江东阳322118 [2]上海交通大学医学院附属第九人民医院口腔医学院口腔修复科,上海200011

出　　处：《上海口腔医学》2019年第6期578-580,共3页Shanghai Journal of Stomatology

基　　金：上海市卫生局项目（201540061）

摘　　要：目的:研究不同CAD/CAM全瓷修复体修复根充后前磨牙的抗折强度。方法:收集21颗因正畸拔除的上颌第一前磨牙,制备近[牙合]面及舌尖缺损洞型。样品分为3组,第1组为直接树脂充填组;第2组为保留缺损组;第3组为纤维桩核组,然后利用IPS e.max CAD全瓷修复体进行修复,采用Rely X U200树脂黏结剂进行黏固。对所有样品进行抗折强度测试,采用光学显微镜观察样品的断裂类型。采用SPSS 15.0软件包对数据进行统计学分析。结果:纤维桩核组全瓷修复体的抗折强度显著大于树脂充填组和保留缺损组。第1组和第2组以修复体破裂为主,第3组除修复体破裂外,还发生牙体组织破裂。结论:对于伴有功能牙尖缺损的前磨牙,建议采用纤维桩核+全瓷冠进行修复。PURPOSE: This study was to evaluate the fracture resistance of endodontically treated maxillary premolars restored with different CAD/CAM all-ceramic restorations in vitro. METHODS: Mesio-occluso-function tip(MOF) cavities were prepared in 21 extracted human maxillary premolars due to endodontic treatment. The teeth were divided into 3 groups. G1:conventional composite resin;G2: cavities;G3: conventional composite resin with a horizontal glass fiber post inserted palatal walls. Restorations were fabricated from a pressable lithium disilicate glass-ceramic and adhesively cemented(Rely X U200). Then, the specimens were subjected to a compressive load at a crosshead speed of 0.5 mm/min until fracture. The fractured specimens were analyzed to determine the fracture pattern using a stereomicroscope. SPSS15.0 software package was used to analyse the data. RESULTS: G3(1570.7 ±108.7) had higher failure load than G1(1214.6±95.8) and G2(1285.9±87.6)(P<0.05). G1 was similar to G2.The crown was lost in G1 and G2. There was a fracture of the crown and tooth in G3. CONCLUSIONS: CAD/CAM all-ceramic crown with fiberglass posts might be an effective method for restoration of endodontically treated premolars with MOF cavity defect.

关 键 词：全瓷修复 CAD/CAM 抗折强度 

分 类 号：R783.1[医药卫生—口腔医学]