Influence of remaining tooth substance and post-endodontic restoration on fracture strength of endodontically treated maxillary incisors

The aim is to evaluate the influence of remaining tooth substance and post-endodontic restoration on fracture strength of endodontically treated maxillary incisors. 150 maxillary central incisors were divided into three groups, Group 0, intact teeth; Group 1, removal of distal wall; Group 2, removal of mesial and distal walls, and further into two subgroups A(0),A(1),A(2) and B-0,B-1,B-2 according to post-endodontic restoration (post/no-post), then loaded to fracture. Interactions among variables and intergroup significance were tested with two-way ANOVA and Kruskal Wallis's tests (p <= 0.05). Tukey's test was applied for multiple comparisons. Statistically significant differences were found between groups B-1-A(1), and B-2-A(2), but they were not found between B-0-A(0). Intragroup analysis showed statistically significant differences in both groups post/no-post with decreasing dental substance. Fiber post placement causes an increase in fracture strength and a reduction of irreparable fractures in endodontically treated maxillary central incisors that lost at least one wall.

Automated summary

This study aimed to evaluate the influence of remaining tooth substance and post-endodontic restoration on fracture strength of endodontically treated maxillary incisors. The findings showed that fiber post placement can increase the fracture strength of endodontically treated maxillary central incisors that lost at least one wall, indicating a potential reduction in irreparable fractures.