【摘要】 目的:研究后牙四单位氧化锆固定桥基底支架的抗折性能。方法:运用CAD/CAM系统设计并制作后牙四单位氧化锆固定桥基底支架,利用一侧第一前磨牙和第二磨牙来修复第二前磨牙和第一磨牙,根据不同基底冠厚度设计分为0.6 mm组和0.7 mm组,每组6个。将所有后牙四单位氧化锆固定桥基底支架粘固于模型上,进行力学加载至断裂。记录所有固定桥的临界载荷,将两组临界载荷数据进行单因素方差分析。结果:两组不同厚度的后牙四单位氧化锆固定桥基底支架临界载荷分别为:0.6 mm组为(1 070.5±139.3)N,0.7 mm组为(1 217.3±120.5)N,经统计学分析两组临界载荷值无明显差异(P>0.05)。结论:两组后牙四单位氧化锆固定桥基底支架的临界载荷均大于口腔最大咬合力(888 N),抗折性能可靠。更多还原

【Abstract】 Objective: The aim of this study was to investigate the fracture resistance of zirconia 4-unit fixed partial dentures( FPDs) framework in the posterior dentition. Methods: A CAD / CAM system was used to prepare zirconia 4-unit FPDs frameworks of different thickness including 0. 6 mm and 0. 7 mm. All FDPs were anchored by first premolar and second molar crowns to rehabilitate the second premolar and the first molar. The prepared FDPs were cemented on the model using resin cement. All the FDPs were subjected to increasing load until fracture happened. One-way ANOVA was used to analyze the data. Results: There was no significant difference among the fracture resistance of group 0. 6 mm( 1 070. 5 ± 139. 3) N and group 0. 7 mm( 1 217. 3 ± 120. 5) N( P > 0. 05). Conclusions: The fracture resistance of zirconia 4-unit FPDs framework in the posterior dentition proved to be reliable.更多还原