Influence of glass fibre post cementation depth on dental root fracture.

Introduction: Glass fibre posts that are newer and have better properties are gaining more popularity than metal posts. However, there is no consensus about the optimal cementation depth of glass fibre posts. In our study, we have attempted to assess fracture resistance of roots restored with glass fibre posts cemented at different root depths.

Materials and methods: Specimens were formed with peeso reamers and a special reamer adapted for the cementation of glass fiber posts at different depths. Glass fibre posts were cemented using self-etching cement: in group 1 - at the depth of 2/3 of the working length of the root canal (11 mm), in group 2 - at the depth of 1/2 of the working length of the root canal (7.5 mm) and in group 3 - at the depth of 1/3 of the working length of the root canal (5 mm). Dental roots were standardized by preparing their walls to equal measurements with a mill. Specimens were embedded on a metal plate at a 45° angle and were vertically pressed with a hydraulic press in buccolingual direction. Fracture force was recorded in Newton (N) to the breaking point.

Results: After data analyses with ANOVA and T-test software, the null hypothesis was confirmed: there was no statistically significant difference among the results of all 3 groups (P >0.05).

Conclusion: The cementation depth of the glass fibre posts that we studied has no influence on root fracture resistance.