Differential hydrolytic degradation of dentin bonds when lutingcarbon fiber posts to the root canal

ABSTRACT

Objective: The purpose of the study was to evaluate the effect of water storage, adhesive system and root canalregion on the hydrolytic degradation of dentin bonds to carbon fiber posts.Study design: Fiber posts were bonded to the root canals using different adhesive systems and composites SB1XT group (Scotchbond 1 XT/RelyX ARC), OBF group (One Up Bond F Plus/Ionotite F), and AB2 group (All Bond2/C&B) After water storage (10 days), all roots were sectioned into 1 mm beams and divided into coronal or apicalgroup. The specimens were stored in water at 22-26 °C temperature for 15 or 60 days and tested for microtensilebond strength at a crosshead speed of 0.9 mm/min after the calculation of the bonding area. Statistical analysis wasperformed with ANOVA followed by Tukey test to detect differences between groups (α=0.05). SEM investigationwas performed to determine the mode of fracture.Results: Bond strength at coronal and apical half showed significant differences between experimental groupsboth after 15 and 60 days of water storage. Premature failures were observed in 16-20% of specimens beforestorage in water.Conclusions: For the bonding systems tested, clinicians should consider that bond strength inside the root canal atapical half is lower than at coronal half irrespective of the adhesive system. The adhesion within the root canal ispossible for SB1 XT and OBF groups unlike the AB2 group where adhesion to root canal dentine is not reliable.Nevertheless, apical half represents the worst scenario in which is possible to obtain a durable adhesion (AU)

RESUMEN

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