A comparative in vitro study to evaluate fracture resistance and failure modes of premolars restored with custom-milled fiber-reinforced resin posts and cores
Abstract
This study aims to evaluate the fracture resistance and failure patterns of premolars restored with custom milled fiber-reinforced resin posts and cores.
Materials and methods:
Twenty newly extracted premolars were collected, then their coronal parts were cut 2 mm above the cementoenamel junction. Endodontic treatment was performed, Then the premolars were placed within acrylic bases, after that the root canals were prepared to receive the posts. The premolars were randomly distributed into two groups:
Group MP: restored with custom milled resin fiber-reinforced posts and cores.
Group PP: restored with prefabricated fiber-reinforced resin posts.
20 metallic crowns were made, then luted to their abutments. The samples were subjected to 45° shear forces until failure occurred. Statistical tests were carried out using SPSS (20).
Results: T student's test showed no significant differences between the mean fracture strength in the two groups (P = 0.149 > 0.05(. For failure patterns, the x2 test showed no significant difference between the two groups (P= 0.160> 0.05).
Conclusion: Within the limits of this study, custom milled resin fiber-reinforced posts and cores can be used for restoring compromised premolars.
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