Post-graduate Program in Dentistry, School of Dentistry, Federal University of Uberlândia, Uberlândia, Brazil.
Department of Oral Health, Technical Health School, Federal University of Uberlândia, Uberlândia, Brazil.
J Mech Behav Biomed Mater. 2021 Jun;118:104433. doi: 10.1016/j.jmbbm.2021.104433. Epub 2021 Mar 3.
To perform a systematic review of the literature focused to evaluate in vitro function of prefabricated fiber posts with and without customization by additional auxillary fiber posts and composite resin on the fracture strength of wide or enlarged canals and the failure pattern.
Six databases were used as primary search sources (PubMed, Scopus, LILACS, SciELO, Science Direct, and Web of Science) and three databases (Open Grey, Open Thesis, and OATD) were used to partially capture the "grey literature". The research included laboratory studies that used human upper anterior teeth aiming to assess the fracture strength and failure pattern of different glass fiber post customizations by additional auxiliary fiber posts or composite resin. The search had no restriction of year, language, and publication status. The risk of bias of the studies was assessed from the criteria established in systematic reviews of laboratory studies. Standardized mean differences were calculated by comparing the mean fracture strengths of customized and non-customized posts. Pooled estimates were calculated by Glass' delta method using the random-effects model. Subtotal estimates were presented according to each type of relining procedure and an overall estimate was described considering all studies combined.
The search provided 2291 results, from which six met the eligibility criteria and were included in the qualitative assessment of the review. Only three studies presented a moderate risk of bias. The meta-analysis results showed that the use of auxiliary posts produced higher mean fracture strengths than non-customized posts (SMD = 2.21; 95%CI: 0.74; 3.68), and it was more effective than the use of composite resin to reline the posts.
Based on laboratories studies, even though has not been observed any difference to a statistically significant level on fracture strength and failure pattern of the customized and non-customized post, future studies should follow a standardized approach to implementation and reporting of data.
系统回顾文献，评估预制纤维桩在不进行和进行额外辅助纤维桩及复合树脂定制时，对根管增宽或扩大的牙体剩余壁薄的牙的抗折强度和破坏模式的体外功能。
6 个数据库被用作初级搜索源（PubMed、Scopus、LILACS、SciELO、Science Direct 和 Web of Science），3 个数据库（Open Grey、Open Thesis 和 OATD）被用于部分捕获“灰色文献”。研究包括使用人上前牙的实验室研究，旨在评估不同玻璃纤维桩定制的额外辅助纤维桩或复合树脂的抗折强度和破坏模式。该研究没有对年份、语言和出版状态进行限制。研究的偏倚风险是根据实验室研究的系统评价标准进行评估的。通过比较定制和非定制桩的平均断裂强度来计算标准化均数差值。使用随机效应模型的 Glass' delta 方法计算汇总估计值。根据每种衬垫程序呈现亚组估计值，并结合所有研究描述一个总体估计值。
搜索提供了 2291 个结果，其中 6 个符合入选标准，并纳入了综述的定性评估。只有 3 项研究存在中度偏倚风险。meta 分析结果表明，使用辅助桩产生的平均抗折强度高于非定制桩（SMD=2.21；95%CI：0.74；3.68），并且比使用复合树脂衬垫更有效。
根据实验室研究，尽管在定制和非定制桩的抗折强度和破坏模式方面没有观察到任何统计学上显著的差异，但未来的研究应该遵循标准化的方法来实施和报告数据。
