Aim and objective: This study aimed to compare the fracture resistance and fracture patterns of maxillary central incisors restored with different post systems.
Materials and methods: Thirty-two human maxillary central incisors were randomly divided into four groups (n = 8). Posts were placed according to the assigned groups: (I) Stainless Steel ParaPost, (II) Fiber White ParaPost, (III) everStick post, and (IV) No post. The cementation was carried out with self-adhesive resin cement, and nonprecious metal crowns were used for the core build-up and restoration. The thermocycling process was conducted for 500 cycles between 5°C and 50°C with a 2-second dwell time and 30-second dipping time, and the samples were subjected to a compressive load at a crosshead speed of 1.0 mm/minute and at an angle of 135° using an Instron testing machine. A Kruskal–Wallis test and Fisher's exact test were used for the data analysis, with p < 0.05.
Results: One of the samples was damaged during the testing, and thus, only 31 samples were used. The highest median load was recorded in group III (764.44 N), followed by group II (702.37 N) and group IV (657.44 N), while group I recorded the lowest median load (505.31 N). Favorable fracture patterns were recorded in groups II, III, and IV, while unfavorable fracture patterns were recorded in group I. The statistical analysis showed that there was no significant difference in the fracture resistance or fracture pattern between all the tested groups (p > 0.05).
Clinical significance: This study helps in determining the prognosis of endodontically treated teeth restored with post and core.
Conclusion: Given the limitations of this study, the metallic and nonmetallic post systems had no significant influence on the fracture resistance and fracture pattern of the maxillary anterior teeth.
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