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Some studies have evaluated, by micro-CT, the formation of microcracks after chemical-mechanical preparation with different instruments [4-10]. In most of these studies, the formation of new microcracks was not observed, regardless of the type or kinematics of the instrument used (continuous or reciprocating rotation) [4-6,8,10]. De Deus, et al. [5] using micro-CT and stereomicroscopy demonstrated that the defects identi ied in the stereomicroscopy analysis were already present before instrumentation or were absent at both times of the micro-CT analysis, indicating that the formation of defects resulted from the sectioning procedure performed prior to the stereomicroscopy. The studies that found microcracks did not report the use of a software to coregister the image stacks [7,9], which con irms whether the same slice was analyzed and if it was in the same position, whilst this could raise doubts about the real presence of new microcracks [6]. Abstract

Influence of retreatment in the formation of dentinal microcracks in mandibular molars filled with a calcium silicate based sealer