Sahafi A, Peutzfeldt A, Ravnholt G, Asmussen E, Gotfredsen K
Department of Prosthetic Dentistry, School of Dentistry, University of Copenhagen, Nörre Allé 20, DK-2200 , Copenhagen N, Denmark.
Clin Oral Investig. 2005 Jun;9(2):84-90. doi: 10.1007/s00784-004-0299-7. Epub 2005 Mar 4.
This in vitro study evaluated the effect of presence of post, presence of core, and of shape, type, and surface treatment of posts on resistance to cyclic loading of crowned human teeth. For all teeth, crowns designed without ferrule were cast in sterling silver and luted with resin cement (Panavia F). Each tooth underwent cyclic loading of 600 N at two loads per second until failure. Teeth that had only been crowned showed significantly higher resistance to cyclic loading than teeth with cores or with post and cores. No significant differences were found between teeth restored with cores only or with post and cores, irrespective of surface-treatment of the posts. Teeth restored with parallel-sided cast post (ParaPost XP) and cores showed significantly higher resistance to cyclic loading than teeth with either tapered cast posts or untreated prefabricated posts of titanium alloy (ParaPost XH) or glass fiber composite (ParaPost Fiber White). No significant difference was found between teeth restored with parallel-sided cast post and cores and teeth restored with untreated prefabricated posts of zirconia (Cerapost). Surface treatment of posts significantly increased the resistance to cyclic loading compared with untreated posts. When posts are used, surface treatment is recommended.
这项体外研究评估了桩的存在、核的存在以及桩的形状、类型和表面处理对带冠人牙循环加载抗力的影响。对于所有牙齿，设计无箍的冠用纯银铸造并用树脂水门汀（Panavia F）粘结。每颗牙齿以每秒两次的加载频率承受600 N的循环加载直至破坏。仅带冠的牙齿比有核或有桩和核的牙齿表现出显著更高的循环加载抗力。仅用核修复或用桩和核修复的牙齿之间未发现显著差异，无论桩的表面处理如何。用平行边铸造桩（ParaPost XP）和核修复的牙齿比用锥形铸造桩或未处理的钛合金预制桩（ParaPost XH）或玻璃纤维复合材料预制桩（ParaPost Fiber White）修复的牙齿表现出显著更高的循环加载抗力。用平行边铸造桩和核修复的牙齿与用未处理的氧化锆预制桩（Cerapost）修复的牙齿之间未发现显著差异。与未处理的桩相比，桩的表面处理显著提高了循环加载抗力。当使用桩时，建议进行表面处理。
