Abstract
ObjectiveThe aim of this study was to compare the correspondence between gap formation and apical microleakage in root canals filled with epoxy resin-based (AH Plus) combined or not with resinous primer or with a dimethacrylate-based root canal sealer (Epiphany). Material and MethodsThirty-nine lower single-rooted human premolars were filled by the lateral condensation technique (LC) and immersed in a 50-wt% aqueous silver nitrate solution at 37ºC (24 h). After longitudinal sectioning, epoxy resin replicas were made from the tooth specimens. Both the replicas and the specimens were prepared for scanning electron microscopy (SEM). The gaps were observed in the replicas. Apical microleakage was detected in the specimens by SEM/energy dispersive spectroscopy (SEM/EDS). The data were analyzed statistically using an Ordinal Logistic Regression model and Analysis of Correspondence (α=0.05). ResultsEpiphany presented more regions containing gaps between dentin and sealer (p<0.05). There was correspondence between the presence of gaps and microleakage (p<0.05). Microleakage was similar among the root-filling materials (p>0.05). ConclusionsThe resinous primer did not improve the sealing ability of AH Plus sealer and the presence of gaps had an effect on apical microleakage for all materials.
Highlights
It is generally accepted that microleakage between the filling materials and root canal walls might adversely affect the outcome of root canal treatment13
Etch-and-rinse adhesives have been tested with resin cements10 and the combination of a dentinbonding agent and an epoxy resin-based root canal sealer significantly reduced apical leakage12
The adjusted model demonstrated that the effect of the type of gap on the logit of microleakage is significant when compared to the presence of types 1 and 2 (Figure 2b and 2c, respectively) of gap with the absence of gap (p=0.047)
Summary
It is generally accepted that microleakage between the filling materials and root canal walls might adversely affect the outcome of root canal treatment. In the last decade, the dentin adhesive technology has been incorporated into the root canal filling techniques to reduce apical and coronal leakage by bonding to root canal walls. In Restorative Dentistry, the self-etch adhesive systems have shown less technique sensitivity, with reliable long-term performance of a two-step mild self-etch adhesive. In Restorative Dentistry, the self-etch adhesive systems have shown less technique sensitivity, with reliable long-term performance of a two-step mild self-etch adhesive5,30 Following this trend, Pentron Clinical Technologies (Wallingford, CT, USA) has developed the Epiphany system, which contains a self-etch primer, a dual-cured composite resin
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