Department of Operative Dentistry and Endodontics, Faculty of Dentistry, Gazi University, Turkey.
Dent Mater J. 2010 May;29(3):262-7. doi: 10.4012/dmj.2009-061. Epub 2010 Apr 24.
The aim of the study was to compare the fracture resistance of maxillary premolars with one remaining cavity wall restored using different post systems. Forty-eight maxillary premolars were endodontically treated and randomly assigned to four groups for postcore restoration. The first three test groups were restored with polyethylene woven fiber posts, custom-made glass fiber-reinforced composite posts, and titanium posts respectively. In the control Group 4, standardized cavities (3.5 x 1.5 mm) were prepared in the palatal canal entrance and filled with a resin composite. All the specimens were then restored with a resin composite crown seated on the post. Load was applied with a stainless steel ball (1 mm/min), and the failure modes of all specimens were evaluated. There were no significant differences in fracture resistance and failure mode among the different restorative materials (p>0.05). Within the limitations of this in vitro study, it was concluded that the presence and type of post did not influence the fracture load and failure mode of maxillary premolar teeth with one remaining cavity wall.
本研究旨在比较不同桩核系统修复后剩余颊壁的上颌前磨牙的抗折能力。48 颗上颌前磨牙经根管治疗后随机分为四组进行桩核修复。前三个实验组分别用聚乙烯编织纤维桩、定制玻璃纤维增强复合材料桩和钛桩修复。在对照组 4 中，在腭侧根管入口制备标准腔（3.5 x 1.5 mm）并用树脂复合材料填充。所有标本均用置于桩上的树脂复合冠修复。用不锈钢球（1mm/min）施加负载，并评估所有标本的失效模式。不同修复材料的抗折力和失效模式无显著差异（p>0.05）。在本体外研究的限制范围内，得出的结论是，剩余颊壁的上颌前磨牙的桩的存在和类型并不影响其骨折负荷和失效模式。
