Effect of Post Placement on the Restoration of Endodontically Treated Teeth: A Systematic Review

Purpose: The aim of this study was to assess the effect of root canal post placement on the restoration of endodontically treated teeth. Materials and Methods: PubMed, the Cochrane Central Register of Controlled Trials (CENTRAL), Scopus, and two Chinese databases (China National Knowledge Internet and the Wan-fang database) were searched to identify randomized or quasi-randomized clinical trials related to post-and-core systems for the restoration of endodontically treated teeth. Studies published prior to August 2013, performed on humans, and written in English or Chinese were considered for inclusion. Two of the authors independently extracted data and assessed the quality of the selected studies. Results: Three studies involving 317 participants were included in the review. Meta-analysis revealed that the risk of overall failure was greater with nonpost (104/271) than with post (78/377) restorations, irrespective of the number of remaining coronal walls (risk ratio [RR] = 0.41; 95% confidence interval [CI], 0.23 to 0.74). The risk of catastrophic failure was greater with nonpost (24/227) than with post (4/329) restorations, irrespective of the remaining coronal walls in restored teeth (RR = 0.11; 95% CI, 0.04 to 0.31). When three or four coronal walls remained, no catastrophic failure occurred in either the post group or the nonpost group. The difference in noncatastrophic failure between the two groups had no statistical significance no matter how many coronal walls remained (P > .05). Conclusions: Post placement appears to have a significant influence on reducing the catastrophic failure rate of endodontically treated teeth. When three or four coronal walls remain, post placement seems to have no influence on the restoration of endodontically treated teeth.