Fracture Resistance of Endodontically Treated Teeth Restored with Different Fiber Post Lengths

Document Type : Original Article

Authors

1 Graduate student, Department of Oral Rehabilitation Sciences, Faculty of Dentistry, Beirut Arab University, Beirut, Lebanon.

2 Professor of Oral Biomaterials, Beirut Arab University, Faculty of Dentistry.

3 Associate Professor of Prosthodontics, Beirut Arab University, Faculty of Dentistry

4 Lecturer of Fixed Prosthodontics, Faculty of Dentistry, Misr University for Science and Technology, Cairo, Egypt

Abstract

Purpose to compare fracture resistance of endodontically treated teeth restored with different lengths of fiber posts.
Materials and methods: Thirty- two freshly extracted sound mandibular premolars of approximate sizes, were mounted centrally and vertically in 12 x 12 x 20 mm acrylic block. Then, decoronated 2 mm above the cemento-enamel junction and were endodontically treated.
Teeth were randomly divided between 4 main groups (n= 8). For all groups, post holes were prepared (group A; post hole less than the crown length (3 mm), group B; post hole equal to the crown length (5 mm), group C; post hole half of the root length (7 mm), group D; post hole 2/3 of the root length (9 mm). Posts were cemented using self-adhesive resin cement. Using core former and light-cured core composite, cores for all specimens were built. A 0.5 mm finish line was prepared with 2 mm ferrule, to receive metal coping. Using universal testing machine, axial loadwas applied at crosshead speed of 0.5 mm/min, parallel to long axis of the tooth until failure.
Results: Group D scored the highest mean fracture resistance values (2670 ± 597.37 N) followed by Group A (2668 ±316.67 N) and Group B (2609 ±523.15 N). Group C scored the lowest fracture resistance values (2517 ±464.35 N). One-way ANOVA revealed no significant difference between groups (P=0.9). Chi-squre test also revealed no significant difference in restorability between the studied groups. (P=0.2).
Conclusions: The tested post lengths had no significant effect on fracture resistance of endodontically treated teeth. Posts having radicular lengths equal to half of the root, showed the most non-restorable fracture pattern among all tested groups.

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