Efecto del Xilol sobre la microdureza de la dentina en retratamiento endodóntico. Un estudio piloto in vitro

Abstract

Introduction: the use of solvents, such as Xylol, is common during endodontic retreatment in order to facilitate gutta-percha removal. However, they can affect dentin microhardness and dentin structure. Objectives: to evaluate the effect of Xylol on dentin microhardness and chemical structure after gutta-percha removal during endodontic retreatment in lower premolars extracted for orthodontic indication. Materials and methods: experimental in vitro study, which included 12 uniradicular premolars extracted for exodontia due to orthodontic treatment. The sample was randomly divided into two groups, six for the "control" group which corresponded to teeth without biomechanical preparation and six for the "exposed" group which corresponded to teeth treated with Xylol. Each tooth was split lengthwise in the vestibulolingual direction. In each group, six halves were studied with Vickers durometer (HV) and three with Raman spectroscopy. Results: dentin microhardness was similar between the teeth without and with Xylol exposure, with an average reported in Vickers test of 55.33.0 HV in the control group compared to 55.63.0 HV in the Xylol group. In the Raman spectroscopy, no differences were observed in the intensity along the spectrum between groups. In both cases, a maximum peak was recorded at 960 cm-1 corresponding to hydroxyapatite levels. Conclusions: the results of this study do not suggest changes in dentin microhardness and chemical structure due to the use of Xylol.