Análise in vitro do terço apical de dentes tratados endodonticamente por meio de radiografias, tomografias computadorizadas, microscópio operatório e fotografias

Abstract

Objectives: In vitro analysis of the apical thrid of endodontically treated teeth by means of radiographs, cone beam computed tomography (CBCT) and operating microscope, to observe the actual location of the foramen, the limit of root canal obturation, the presence of foramina and the adaptation of the gutta-percha cone in the mesiodistal direction. Methods: Seven mandibles were used, from which ten canines were selected. After opening the root canal, 0.5mm short of the radiographic apex, instrumentation and canal obturation, the final radiography and CBCT were carried out, followed by extraction of elements for analysis of the apical third through the operating microscope and radiographs. Results: It was found that the apical limit of root canal obturation was in the desired length in 70% of the samples when evaluated through radiographs and CBCT, but leaked in 20% when observed with CBCT and operating microscope, and in 10% when observed with X-rays. In relation to the actual location of the foramen, 30% of the elements were coincident with the apex, under the operating microscope. In the tomographic images it was verified that in 40% the foramen was in the apex and in 60 % paraapical. By observing the obturation in a mesiodistal direction through radiographs and CBCT, it was found that the appropriate filling was not achieved as observed in the buccolingual direction. Conclusion: In most cases the actual location of the foramen does not coincide with the apical vertex, and foramina are found in varying numbers. The limit of root canal obturation shown in radiographs does not always reflect the real apical location of the gutta-percha cone, when compared to CBCT. X-rays do not reflect accurately the mesiodistal aspect of the root canal. Keywords | Tooth apex; Endodontics; Radiography; Microscopy; Tomography. In vitro analysis of the canal treated teeth in jaws CT, operating microscope and photographs