Department of Restorative Dentistry, Piracicaba Dental School, State University of Campinas - UNICAMP, Piracicaba, SP, Brazil.
Department of Prosthodontics, Federal University of Santa Catarina - UFSC, Florianópolis, SC, Brazil.
J Prosthodont. 2023 Dec;32(9):807-814. doi: 10.1111/jopr.13628. Epub 2022 Dec 27.
To evaluate the influence of post type and mechanical aging on compression force resistance, fracture pattern, and stress distribution in weakened roots.
Bovine roots were endodontically treated and widened-and randomly divided into 8 groups (n = 10) according to post type (prefabricated glass fiber post and customized anatomic glass fiber post, milled glass fiber post-and-core, and milled polyetheretherketone post-and-core) and mechanical aging (without and with mechanical aging). Three hundred thousand cycles of mechanical fatigue were performed and compression force resistance (N) was analyzed by two-way ANOVA and Tukey test (α = 0.05). Fracture patterns were reported and stress distribution was analyzed by finite elements analysis.
There was a significant effect of post type (p = 0.032) and mechanical aging (p = 0.009), but no double interaction (p = 0.879). Higher values were recorded in the milled glass fiber and polyetheretherketone post-and-core groups compared to the prefabricated glass fiber post groups, and no significant difference was found among anatomic glass fiber post groups and other groups. Reparable fractures were predominant in the milled glass fiber and polyetheretherketone post-and-core groups. Prefabricated glass fiber posts and milled polyetheretherketone post-and-cores showed similar stress distribution.
Post type and mechanical aging influence the compression force resistance and fracture pattern of weakened roots. Milled glass fiber and polyetheretherketone post-and-cores exhibited higher compression force resistance and more reparable fractures compared to prefabricated glass fiber posts. Prefabricated glass fiber posts and milled polyetheretherketone post-and-cores showed similar stress distribution.
评估不同桩核类型和力学老化对薄弱牙根抗压强度、破坏模式和应力分布的影响。
牛牙根经根管治疗后进行扩孔，并根据桩核类型（预制玻璃纤维桩和定制解剖玻璃纤维桩、铣削玻璃纤维桩核、铣削聚醚醚酮桩核）和力学老化（无和有机械老化）随机分为 8 组（每组 n = 10）。对样本进行 30 万次机械疲劳循环后，采用双因素方差分析和 Tukey 检验（α = 0.05）分析抗压强度（N）。报告破坏模式并通过有限元分析评估应力分布。
桩核类型（p = 0.032）和力学老化（p = 0.009）有显著影响，但无双重交互作用（p = 0.879）。与预制玻璃纤维桩组相比，铣削玻璃纤维和聚醚醚酮桩核组的抗压强度更高，解剖玻璃纤维桩组与其他组之间无显著差异。铣削玻璃纤维和聚醚醚酮桩核组以可修复性破坏为主。预制玻璃纤维桩和铣削聚醚醚酮桩核的应力分布相似。
桩核类型和力学老化影响薄弱牙根的抗压强度和破坏模式。与预制玻璃纤维桩相比，铣削玻璃纤维和聚醚醚酮桩核具有更高的抗压强度和更多的可修复性破坏。预制玻璃纤维桩和铣削聚醚醚酮桩核的应力分布相似。
