Sinais radiográficos preditivos de proximidade entre terceiro molar e canal mandibular através de tomografia computorizada

Abstract

Objectives

This study aimed to analyze the reliability of radiographic panoramic signs in predicting the correct proximity of mandibular third molars (M3s) with the mandibular canal using cone beam computerized tomography (CBCT). Methods

A prospective and observational study was conducted with 23 panoramic radiographs and 23 CBCT of 23 volunteers. Panoramic radiographs were compared with CBCT images of these subjects in relation to the bone thickness between root surface and mandibular canal. Univariate, bivariate and multivariate analyzes were performed. Non‐parametric data were compared using the Kruskal‐Wallis/Dunn tesr and sensitivity, specificity, positive and negative predictive values, and accuracy were calculated. It was considered a 95% significance level (p <0.05). Results

Eighty‐six signs of proximity between M3s and mandibular canal were observed, mainly the root apices darkening (32.6%; p = 0.0230). The mandibular canal interruption showed the highest sensitivity (75%), and the root bifid apices showed the highest specificity (100%). Mandibular canal diversion presented the highest predictive value (100%). The most accurate parameter was the mandibular canal interruption (78.5%). Conclusion

Panoramic radiographs signs showed high sensitivity, specificity and accuracy to predict proximity of M3s with the mandibular canal.