Độ bền kháng gãy của răng hàm nhỏ thứ nhất hàm trên đã điều trị nội nha được phục hồi bằng composite và chốt sợi

Abstract

The study compared the fracture resistance and evaluated mode of failure of endodontically treated maxillary first premolars restored with composite and fiber posts in different groups. In this in-vitro study, 20 maxillary first premolars with 2 root canals extracted for orthodontic reasons in adults under 30 years old were selected and divided into 4 groups (n = 5): group 1 with four walls and group 2 with 3 remaining walls were restored with composite, group 3 with 2 remaining walls and group 4 with no remaining walls were restored with composite and fiber posts. The specimens were then evaluated with compressive load until fracture, the maximum value and the fracture pattern were recorded. The data analyzed with ANOVA test on SPSS 25 software showed that compressive loads of group 1, 2 and 3 are similar and is highest in group 4 (2272,88 N) (p = 0.003). Failure severity increases as the number of remaining walls decreases. Particularly, there are fractures mainly along the interface between the post and composite core, and between the composite and remaining structure.