Influence of dentin pretreatment with synthetic hydroxyapatite application on the bond strength of fiber posts luted with 10‐methacryloyloxydecyl dihydrogen phosphate‐containing luting systems

The aim of this in vitro study was evaluate the effect of application of synthetic hydroxyapatite on fiber post bond strength to radicular dentine. Forty, single‐root teeth were endodontically treated and an 8 mm post space was prepared. Specimens were randomly placed in four groups (n = 10 in each) and treated using the following fiber post luting procedures: group 1, 17% EDTA + Panavia SA; group 2, 17% EDTA + Teethmate Desensitizer + Panavia SA; group 3, All‐Bond Universal + Duo‐Link Universal; and group 4, All‐Bond Universal + Teethmate Desensitizer + Duo‐Link Universal. Fiber posts were luted in the post space and light‐cured for 120 s using a light‐emitting diode (LED) lamp. After 7 d of storage at 37°C, the teeth were cut into 1‐mm‐thick slices, which were subjected to a push‐out test until failure using a universal testing machine. Two specimens per group were prepared for scanning electron microscopy analysis. An energy‐dispersive X‐ray spectroscopy detector was used for elemental analysis of the specimen surface. The results were statistically analyzed using one‐way anova . The fiber post bond strength was statistically significantly increased after the application of Teethmate Desensitizer to post space walls, either with a 10‐MDP‐containing self‐adhesive cement or with a universal adhesive. Scanning electron microscopy and EDAX analysis showed that Teethmate Desensitizer created a calcium phosphate precipitate over post space dentinal tubules, which significantly improved the bond strength of the fiber post luted with 10‐methacryloyloxydecyl dihydrogen phosphate (10‐MDP)‐containing adhesive systems.