In vitro fracture resistance and marginal adaptation of metallic and tooth-coloured post systems.
In vitro fracture resistance and marginal adaptation of metallic and tooth-coloured post systems.
复制标题
金属和牙色桩系统的体外抗断裂性和边缘适应。
DOI：
10.1111/j.1365-2842.2004.01286.x
复制
发表时间：
2004
影响因子：
2.9
通讯作者：
G. Handel
中科院分区：
文献类型：
--
作者：
M. Rosentritt;M. Sikora;Michael Behr;G. Handel
本体外研究的目的是比较全瓷冠与全瓷桩，玻璃纤维增强桩和钛桩以及对照无任何桩的抗折强度和边缘适应性。三组共8颗上颌切牙分别用全瓷桩、纤维增强复合材料桩、钛桩修复，另一组不使用桩。提供复合核，并制作全瓷冠。人工老化后，测定修复牙的抗折强度。用扫描电镜观察老化前后牙体-冠界面的变形情况。无桩修复牙[270 N（235/335）]与钛系统修复牙[340 N（310/445）]的断裂强度无显著差异。全瓷桩[580 N（425/820）]和FRC桩[505 N（500/610）]均提供了比无桩牙显著更高的抗断裂性。在老化之前，所有材料均显示出在牙骨质边缘或牙骨质边缘与牙冠之间的分离<5%（“边缘间隙”）。老化后，所有系统的接口恶化到6%和14%的边缘间隙之间的值。最大的边缘间隙发现钛系统（14%）在粘接剂-冠界面和全瓷桩（12%）在粘接剂-牙齿之间的过渡。关于抗断裂性和边缘适应性，全瓷和FRC桩可被视为常用钛桩置换的替代品。
The aim of this in vitro study was to compare the fracture resistance and marginal adaptation of all-ceramic incisor crowns with all-ceramic posts, glass-fibre-reinforced posts and titanium posts as well as a control without any post. Three groups of eight maxillary incisors were restored with an all-ceramic post, a fibre-reinforced composite (FRC) post, a titanium post and a further group was restored without posts. Composite cores were provided and all-ceramic crowns were adhesively luted. After artificial ageing, the fracture resistance of the restored teeth was determined. The marginal adaptation of the restorations at the interfaces between cement-tooth and cement-crown was evaluated with scanning electron microscopy using replica specimen before and after ageing. The restored teeth without posts [270N (235/335)] showed no significantly different fracture strength compared with teeth with the titanium system [340N (310/445)]. The all-ceramic posts [580N (425/820)] and the FRC posts [505N (500/610)] both provided a significant higher fracture resistance than the teeth without posts. Prior to ageing, all materials showed <5% separation at the margins cement-tooth or cement-crown ('marginal gap'). After ageing, the interfaces of all systems deteriorated to values between 6 and 14% marginal gap. The greatest marginal gap was found with the titanium system (14%) at the interface cement-crown and with the all-ceramic posts (12%) at the transition between cement-tooth. Regarding fracture resistance and the marginal adaptation, the all-ceramic and FRC posts may be considered as an alternative to the commonly used titanium post restorations.