Avaliação da forma do forame apical apos sua patencia e ampliação com instrumentos endodonticos / Morphological study of the apical foramen after patency with endodontic files

AUTOR(ES)

Egas Moniz de Aragão

DATA DE PUBLICAÇÃO

2010

RESUMO

The resulting shape of the apical foramens of 48 teeth - 23 lower incisors and 25 upper or lower cuspids - was evaluated after enlargement with 3 or 5 K-type files in root canal treatment performed with radicular access before the crown-down instrumentation technique and followed by serial instrumentation of the canal, with the file going beyond the apical foramen, so as to enlarge it. The apical foramens of each one of the teeth were evaluated with scanning electron microscope, before the instrumentation, after the enlargement with the first apical file and two other instruments, plus a third assessment after the use of two more instruments - totaling four files in addition to the initial anatomical file. In the photomicrographs, 100x and 150x magnification, eight radiuses of each apical foramen were measured with the help of an image analysis software from the center of their largest diameter. The division of the standard deviation of those measurements by the average reflects the regularity of the foramens in numerical terms. The analysis of the numbers indicated that the apical foramens were evened by the enlargement with 3 and 5 files, in both cases with statistically significant difference from the original shape. Such analysis, dividing the 48 teeth into groups, showed: a) greater evenness of the apical foramen in canals with less pronounced root curvature, with statistically significant difference when compared to the moderate curvature group; and, b) better result in teeth with no root canal apical curvature, with statistically significant difference, when compared to teeth with root canal apical curvature, a fact observed even in straight roots. The enlargement of apical foramens was proven to even their shape, with better result in less curved canals, rendering them more circular, with the exception of teeth with canals having apical curvature, in which the foramens suffered deformation

ASSUNTO(S)

endodontia endodontics

Documentos Relacionados

• The importance of apical patency and cleaning of the apical foramen on root canal preparation
• Study of the discrepancy between the areas of the initial apical instrument and of the apical foramen in the maxillary incisors
• Influence of Apical Patency and Cleaning of the Apical Foramen on Periapical Extrusion in Retreatment
• Relationship between files that bind at the apical foramen and foramen openings in maxillary central incisors - a SEM study
• Influência do alargamento foraminal na anatomia apical e na qualidade de selamento após obturação