Abstract
(ISO/TS11405:2003) and immersion in a 2% methylene-blue (24h). The null-hypothesis is an absence of infiltration, voids after thermocycling. After the image steromicroscope acquisition (13×), the macrostructural analysis exploited a digital automated software (Jmicrovision), in order to assess the degree of infiltration, presence of guttapercha, micro or macrovoids. The data were statistically analysed using Chisquared and t-student test (p=0.05). Results: The etching procedure improves the compositedentin bond by reducing the rate of infiltration: we observed a significant infiltration in sections until 5mm in group B (p<0.05). The presence of voidswas due only to operator errors or anatomical variables, since the self-mixing application system ensures no air bubbles within the material. Conclusion: A further etching step could be a reliable method to improve the cement-dentin adhesion in post luting.
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