Static and fatigue fracture resistances of pulpless teeth restored with post-cores
Static and fatigue fracture resistances of pulpless teeth restored with post-cores
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DOI：
10.1016/j.dental.2008.01.009
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发表时间：
2008-09-01
期刊：
影响因子：
5
通讯作者：
Ebisu, Shigeyuki
中科院分区：
文献类型：
--
作者：
Hayashi, Mikako;Sugeta, Atsushi;Ebisu, Shigeyuki
目标.由于无髓牙的牙根纵裂在日常临床实践中仍然是一个主要问题，因此需要确定有效加强无髓牙的上级修复方法。本研究验证了无髓牙在不同类型桩核系统修复后的抗静态和疲劳断裂性能无差异的零假设。对离体人前磨牙采用纤维桩或金属桩与复合树脂核联合修复。无桩核置换的全冠预备牙作为对照。对修复后的牙齿施加90 °垂直或45 °倾斜静态压缩载荷，记录断裂载荷和断裂模式。疲劳断裂试验通过施加正弦循环载荷从垂直或斜向修复牙齿进行。使用阶梯法计算每个修复体的疲劳极限。在垂直或斜向载荷下的静态和疲劳断裂试验中，纤维桩修复的牙齿的断裂载荷明显大于金属桩修复的牙齿。纤维桩和金属桩垂直向疲劳极限分别为112kgf和82kgf。载荷和斜载荷下的26 kgf和20 kgf。显著性。纤维桩和复合树脂核的组合显示出对静态和疲劳载荷的上级抗断裂性优于使用金属桩的修复，因此推荐用于修复无髓牙。(c)2008年，牙科材料学院。由爱思唯尔有限公司出版。保留所有权利。
Objectives. Superior restorative methods for effectively strengthening pulpless teeth need to be identified, since vertical root fractures of pulpless teeth are still a major problem in everyday clinical practice. The present study tested the null hypothesis that there were no differences in static and fatigue fracture resistances of pulpless teeth restored with different types of post-core systems.Methods. Extracted human premolars Were restored with a combination of either a fiber post or metallic post and a composite resin core. Teeth with full crown preparations without post-core restorations served as a control. A 90 degrees vertical or 45 degrees oblique static compressive load was applied to restored teeth, and fracture loads and modes of fracture were recorded. Fatigue fracture tests were conducted by applying sinusoidal cyclic loads to restored teeth from vertical or oblique directions. Fatigue limits for each restoration were calculated using the staircase approach.Results. In both static and fatigue fracture testing under vertical or oblique loadings, the fracture loads of teeth restored with fiber posts were significantly greater than those of teeth restored with metallic posts. The fatigue limits of teeth restored with fiber and metallic posts were 112 kgf and 82 kgf respectivel, undervertical. loadings and 26kgf and 20kgf under oblique loadings.Significance. The combination of a fiber post and a composite resin core showed superior fracture resistance against both static a rid fatigue loadings compared to restorations using a metallic post, and is therefore recommended in restoring pulpless teeth. (c) 2008 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.