计算机辅助设计与制造（CAD/CAM）生成的槽式嵌体固定局部义齿的断裂载荷。
Fracture load of CAD/CAM-generated slot-inlay FPDs.
作者信息
Bindl Andreas, Lüthy Heinz, Mörmann Werner H
机构信息
Clinic of the Division of Aesthetics and Computer Restorations, Department of Preventive Dentistry, Periodontology and Cariology, Center for Dental and Oral Medicine, University of Zurich, Switzerland.
出版信息
Int J Prosthodont. 2003 Nov-Dec;16(6):653-60.
PURPOSE
This study investigated fracture load of computer-aided design/manufacturing (CAD/CAM)-generated slot-inlay fixed partial dentures (FPD) machined from ceramic and composite.
MATERIALS AND METHODS
Ninety slot-inlay FPDs were machined in groups of 15 specimens each using the same design on a Cerec 3 unit. Materials were assigned to groups: (1) Mk II feldspathic ceramic, (2) ProCAD glass-ceramic, (3) glass-ceramic 1, (4) glass-ceramic 2, (5) composite 1, and (6) composite 2. The slot-inlay FPDs were placed on models with two abutment teeth without cementation and loaded to fracture. For control, test bars (n = 15) were machined from each of the materials, and flexural strength was examined using three-point bending. Data were statistically analyzed using ANOVA and Scheffé tests.
RESULTS
Fracture load of groups 4 (1,557 N, SD 236), 5 (1,048 N, SD 77), and 6 (1,512 N, SD 106) was significantly higher than that of groups 1 (652 N, SD 53) and 2 (773 N, SD 65). Flexural strength of group 4 (256 MPa, SD 20) was significantly higher than that of groups 1 (103 MPa, SD 6), 2 (127 MPa, SD 15), 3 (162 MPa, SD 32), 5 (178 MPa, SD 18), and 6 (170 MPa, SD 20).
CONCLUSION
Fracture loads of glass-ceramic 2 and composite 2 appear adequate for CAD/CAM slot-inlay FPDs.
目的
本研究调查了由陶瓷和复合材料通过计算机辅助设计/制造（CAD/CAM）加工而成的槽式嵌体固定局部义齿（FPD）的断裂载荷。
材料与方法
在Cerec 3单元上使用相同设计，以每组15个样本的方式加工90个槽式嵌体FPD。材料分为以下几组：（1）Mk II长石质陶瓷，（2）ProCAD玻璃陶瓷，（3）玻璃陶瓷1，（4）玻璃陶瓷2，（5）复合材料1，（6）复合材料2。将槽式嵌体FPD放置在带有两颗基牙的模型上，不进行粘结，并加载直至断裂。作为对照，从每种材料加工测试棒（n = 15），并使用三点弯曲法检测其弯曲强度。数据采用方差分析和谢费检验进行统计学分析。
结果
第4组（1557 N，标准差236）、第5组（1048 N，标准差77）和第6组（1512 N，标准差106）的断裂载荷显著高于第1组（652 N，标准差53）和第2组（773 N，标准差65）。第4组的弯曲强度（256 MPa，标准差20）显著高于第1组（103 MPa，标准差6）、第2组（127 MPa，标准差15）、第3组（162 MPa，标准差32）、第5组（178 MPa，标准差18）和第6组（170 MPa，标准差20）。
结论
玻璃陶瓷2和复合材料2的断裂载荷似乎适用于CAD/CAM槽式嵌体FPD。
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