Análise comparativa do selamento apical endodôntico por meio de micro tomografia computadorizada e da tomografia por coerência óptica

Abstract

The aim of this research was to comparatively evaluate the appearance of endodontic apical sealing promoted by three obturation protocols used in oscillatory system through optical coherence tomography (OCT) and micro tomography (μCT). It was a study in vitro with a sample sample consisted of 45 single-rooted teeth with round canals, instrumented with reciproc system and obturated through the techniques obturation of lateral condensation, thermomechanical compression and single cone with guta-percha and AH Plus. The samples were scanned in the apical region by a microcomputer tomography using the parameters of tension 80 kV, 222 uA current and magnification 120.0981 without filter with 11μm resolution, and then were analyzed topographically by an optical coherence tomography with a resolution of 10 micrometres. The images were processed and analyzed with the aid of ImageJ program, identifying and measuring the cracks formed by faults in obturation techniques in the three axes of analysis in double analysis by calibrated examiner. Inferential analyzes were implemented, through tests chi-square Pearson's or Fisher's exact test, with the purpose to check the data normality, the Kolmogorov-Smirnov test was applied and then the nonparametric Kruskal-Wallis test, when it found the p< 0,05, applied the Mann Whitney test in order to compare the groups two by two. The validity of the OCT use as a diagnostic test was observed by means of sensitivity and specificity tests. As a result, we note that the median for the working length was constant in relation to the obturation techniques and analysis methods. For detection of slits in the apical region, the OCT showed sensitivity (97%) and specificity (73%) appropriate when compared to the μCT. In both methods of detection the greater presence of cracks was found in the technique of lateral condensation (µCT p=0,011/ OCT p=0,002). In conclusion, the OCT can be used to visualization slits in the apical obturation and lateral condensation technique presented a higher number of slits, in larger dimensions.