A comparative in vitro study to evaluate fracture resistance and failure modes of individual polyether ketone ketone posts and cores
Abstract
This study aims to evaluate the fracture resistance and failure patterns of individual polyether ketone ketone (PEKK ) posts and cores restoring indodontically treated premolars. 20 mandibular first premolars ex-tracted for orthodontic reasons were cut above the cementoenamel junction by 2mm. En-dodontic treatment was performed, then samples randomly distributed to two groups, Group 1: Restored with individual milled polyether ketone ketone posts and cores. Group 2: Restored with prefabricated fiberglass -reinforced resin posts and composite cores buildups. The samples were subjected to shear forces at an angle of 45 until the failure oc-curred. The values were recorded in Newton, and the patterns of failure were examined. Statistical analyses were performed using SPSS software (Version 20). The T student test was used for independent groups and the x2 test at a significance level (a=0.05)
Results: T-student test showed no statistically significant differences between the means of fracture resistance in the two groups (P= 0.738> 0.05). The mean fracture resistance in group (1) was (423.2 ± 113.28) Newton, while in the group (2) (439.5 ± 100.616) Newton. For failure patterns, the X2 test showed no difference between the two groups (P=0.371>0.05).
Conclusion: Within the limitations of this study, individual polyether ketone posts can be used in restoring endodontically compromised premolars.
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