Influence of the Resin Cement Insertion Protocol on the bond Strength of Glass-Fiber Posts
Abstract
Objective: Evaluate the effect of different techniques for insertion of the resin cement on the bond strength of glass-fiber posts cemented with RelyX U200. Methods: Thirty single-rooted premolars were sectioned at 14 mm from the apex, prepared with ProTaper Universal system and filled by single-cone technique with AH Plus sealer. Root canal filling was partially removed, maintaining 4 mm of gutta-percha at the apical third. Specimens were randomly divided into 3 experimental groups (n=10), according to the strategy used to fiber post cementation, as described: CENTRIX, POST/CEMENT, LENTULO. Exacto N1 glass fiber posts were placed into root canal and cemented with RelyX U200. A cutting machine was used for root’s sectioning providing 3 slices, one for each root third (cervical, medium and apical). Push-out test was performed using a universal testing machine and stereomicroscope was used to analyze the failure mode. Results: CENTRIX (10,05 ± 3,25 Mpa) and LENTULO (9,80 ± 3,21 Mpa) showed higher means of bond strength values, superior to POST/CEMENT (6,47 ± 3,85 Mpa). Regarding to root third, the cervical third presented the higher bond strength mean (10,62 ± 3,66 Mpa) and the apical root third presented the lowest bond strength values (6,58 ± 3,28 Mpa). Conclusion: Bond strength values of glass fiber posts are influenced by the method of insertion of the resin cement RelyX U200. On this sense Centrix and Lentulo systems are recommended.
Keywords
Endodontics, Bond strength, Glass fiber posts, Self-adhesive resin-cement
DOI: https://doi.org/10.18256/2238-510X/j.oralinvestigations.v6n1p62-74
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Journal of Oral Investigations - JOI (ISSN 2238-510X)
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