University of Turin Dental School, Department of Cariology and Operative Dentistry, via Nizza 230, 10126 Turin, Italy.
J Dent. 2012 Oct;40(10):814-20. doi: 10.1016/j.jdent.2012.06.005. Epub 2012 Jun 26.
The aim of this study was to investigate the influence of post placement on fracture resistance of endodontically treated mandibular molars restored with adhesive overlay restorations.
Endodontically treated human molars with two- and one-wall cavities either underwent or did not undergo fibre post insertion within composite build-up before cementation of indirect composite onlay restorations. The specimens were thermocycled, exposed to cyclic loading, and submitted to the static fracture resistance test. Fracture loads and mode of failure were evaluated.
Statistical analysis revealed that specimens with fibre posts demonstrated similar failure loads (p=0.065) but more favourable fracture patterns compared with specimens without fibre posts. No difference was found between two- and one-wall cavities.
Within the limitations of this study, the insertion of fibre posts did not improve support under indirect composite overlays.
When restoring heavily broken down endodontically treated mandibular molars with an indirect overlay composite restoration, the fibre post inserted within the composite build-up do not provide any increase in fracture resistance.
本研究旨在探讨纤维桩在复合树脂核修复后对根管治疗下颌磨牙抗折性能的影响。
对具有两壁和单壁窝洞的人磨牙进行纤维桩插入或不插入，然后在间接复合树脂覆盖修复体粘固前进行复合树脂堆核。对标本进行冷热循环、循环加载，并进行静态抗折强度试验。评估了断裂载荷和失效模式。
统计分析显示，与无纤维桩的标本相比，纤维桩组的试件具有相似的失效载荷（p=0.065），但具有更有利的断裂模式。两壁和单壁窝洞之间没有差异。
在本研究的限制范围内，纤维桩的插入并不能为间接复合覆盖物提供支持。
在使用间接复合覆盖体修复严重破坏的根管治疗下颌磨牙时，纤维桩插入复合树脂堆核内并不能提高抗折强度。
