Influência do alargamento foraminal na anatomia apical e na qualidade de selamento após obturação / Influence of apical foramen widening on apical foramen morphology and apical sealing

AUTOR(ES)
FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

26/04/2011

RESUMO

Introduction: The aim of this study was to evaluate the influence of the working length and apical foramen widening on the anatomy of the apical foramen and on the sealing ability after root canal filling. Methods: Fifty-five palatal roots of maxillary molars were selected. The samples were randomly divided into three groups (n=15) according to the different working lengths. Group 1, instrumentation 1 mm short of the major foramen; group 2, instrumentation in the limit of the apical foramen; and group 3, instrumentation 1 mm beyond the foramen. All groups were prepared using nickel-titanium rotary files, the instrumentation was made by enlarging the root canal to at least three times the size of the first file that bound at the working length, and the canals were obturated with AH Plus and gutta-percha. Photomicrographs were taken using a scanning electron microscopy (SEM) before instrumentation, after instrumentation of the apical foramen with each file, and after root canal filling. Moreover, coronal bacterial microleakage with Enterococcus faecalis was performed, including positive controls (n=5) and negative controls (n=5). Results: The cemental canal was uninstrumented when the instrumentation was made 1 mm short of the major foramen. The quality of the apical foramen widening at the limit of the apical foramen and 1 mm beyond the foramen showed no statistical differences. However, instrumentation 1 mm beyond the apical foramen promoted more deviations from the original foramen anatomy, but these deviations do not affect the quality of sealing or bacterial infiltration. Conclusions: Microscopic analysis showed that both widening groups (G2 and G3) resulted in good quality apical foramen obturation. However, statistical analysis of the bacterial leakage showed no statistically significant differences between all of the groups tested.

ASSUNTO(S)

endodontia Ápice dentário canal radicular - tratamento endodontics tooth apex root canal preparation

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