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Hand file and manual rotary file behavior in curved canals: an ex vivo micro-CT study
Pablo A Amoroso-Silva1, Thais Machado de Carvalho Coutinho2, Thiago S Guimarães3
1Universidade Estadual de Londrina, Departamento de Odontologia Restauradora, Londrina, Paraná, Brasil.
Abstract:
Several instrumentations systems are available in the market and it is necessary to assess their behavior in curved root canals.
Aim:
To analyze the ability of two manual instrumentation techniques to center mesial root canals of mandibular molars, studied by computed microtomography (micro-CT).
Materials And Method:
Twenty mesial root canals of mandibular molars were matched based on similar morphological dimensions using micro-CT evaluation and divided in 2 groups (n=10): (1) Crown-down technique with Gates-Glidden drills and K-Flexofiles and (2) M manual NiTi rotary system. Changes in volume, surface area and canal transportation were compared using an unpaired t-test with a 5% significance level.
Results:
No significant differences were observed between groups regarding volume surface area after root canal preparation (p>0.05). Variation in the centroid differed between groups in the total canal length, and in the cervical and middle thirds, with better centralization for the M files (p<0.05).
Conclusions:
Both manual instrumentation techniques had similar volume and surface area variation. Both techniques left unprepared canal areas with similar values. M manual NiTi files caused minor canal transportation.
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