Fracture resistance of pulpless teeth restored with post-cores and crowns
Fracture resistance of pulpless teeth restored with post-cores and crowns
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DOI：
10.1016/j.dental.2005.03.017
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发表时间：
2006-05-01
期刊：
影响因子：
5
通讯作者：
Ebisu, S
中科院分区：
文献类型：
--
作者：
Hayashi, M;Takahashi, Y;Ebisu, S
目标.本研究旨在验证零假设，即不同类型桩核系统和全覆盖冠修复无髓牙的抗折强度没有差异。拔除人上颌前磨牙，分别用纤维桩、预制金属桩和铸造金属桩核进行修复。无桩核置换的全冠预备牙作为对照。所有患牙均行全冠修复。以0.5mm/min的速度，对修复体施加90 °垂直或45 °倾斜载荷，记录其断裂载荷和断裂方式。在垂直载荷条件下，铸造金属桩核修复的牙体的断裂载荷最大（两因素析因方差分析和Scheffe 'sF检验，P
Objectives. The present study was designed to test the null hypothesis that there is no difference in the fracture resistance of pulpless teeth restored with different types of post-core systems and full coverage crowns.Methods. Extracted human upper premolars; were restored with a fiber post, prefabricated metallic post or cast metallic post-core. Teeth with full crown preparations without post-core restorations served as a control. All teeth were restored with full coverage crowns. A 90-degree vertical or 45-degree oblique toad was applied to the restored teeth with a crosshead speed of 0.5 mm/min, and the fracture loads and mode of fracture were recorded.Results. Under the condition of vertical loading, the fracture load of teeth restored with the cast metallic post-cores was greatest among the groups (two-factor factorial ANOVA and Scheffe's F test, P