一项关于经根管治疗且模拟根管扩大的牙齿，采用不同桩核系统修复后的断裂强度的体外评估。
An in vitro evaluation of fracture strength of endodontically treated teeth with simulated flared root canals restored with different post and core systems.
作者信息
Hegde Jayshree, Bashetty Kusum
机构信息
Department of Conservative Dentistry and Endodontics, The Oxford Dental College and Hospital, Bangalore, Karnataka, India.
出版信息
J Conserv Dent. 2012 Jul;15(3):223-7. doi: 10.4103/0972-0707.97942.
PURPOSE
The objective of this study is to evaluate the fracture strength and mode of failure of endodontically treated teeth with flared canals restored with two fiber reinforced systems (glass fiber and quartz fiber) and one base metal cast post and core system.
MATERIALS AND METHODS
Forty five anterior teeth were decoronated at cemento-enamel junction and were endodontically treated. Post space was prepared and randomly divided into three groups according to post system. Specimens were loaded at 45° in a universal testing machine at a cross head speed of 0.5 mm/min until failure. The mode of failure was classified as repairable or non-repairable.
RESULTS
Teeth restored with cast posts have fracture strength twice that of teeth restored with fiber posts. Fiber-reinforced posts failed at a certain compressive force but they were repairable unlike the non-repairable fracture seen with cast posts.
CONCLUSION
The results of this study showed that, fracture strength and mode of failure in anterior teeth with flared canals varied according to the type of post used to support a crown.
目的
本研究的目的是评估用两种纤维增强系统（玻璃纤维和石英纤维）以及一种贱金属铸造桩核系统修复的根管扩张的牙髓治疗牙齿的断裂强度和失效模式。
材料与方法
45颗前牙在牙骨质-釉质界处截冠并进行牙髓治疗。制备桩道并根据桩系统随机分为三组。在万能试验机中以45°角、0.5mm/min的十字头速度加载试样直至失效。失效模式分为可修复或不可修复。
结果
用铸造桩修复的牙齿的断裂强度是用纤维桩修复的牙齿的两倍。纤维增强桩在一定的压缩力下失效，但与铸造桩出现的不可修复骨折不同，它们是可修复的。
结论
本研究结果表明，根管扩张的前牙的断裂强度和失效模式根据用于支持牙冠的桩的类型而有所不同。
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