In vitro evaluation of the presence of apical deviation with employment of automated handpieces with continuous and alternate motion for root canal preparation

Abstract

he present study conducted an in vitro evaluation of the presence of apical deviation on the root canal preparation of the mesiobuccal roots of human maxillary molars employing automated handpieces with continuous motion, the Pow R system (Moyco Union Broach), and alternate motion, the M4 system (Kerr). Analysis of the presence of apical deviation was carried out by means of radiographs obtained on a radiographic desk fabricated for the study. The results demonstrated the lack of statistically significant differences between the two systems as to the evaluation of the presence of apical deviation. There was no correlation between the degree of curvature of the roots and the degree of apical deviation for the continuous motion system. However, there was a statistic difference for the alternate motion system, with a direct correlation of moderate degree. Uniterms: Root canal preparation; Apical deviation; Rotary instruments. presente trabalho avaliou, in vitro, a presença de desvio apical no preparo de canais radiculares em raízes mésio-vestibulares de molares superiores humanos utilizando-se de peças automatizadas de giro contínuo, sistema Pow R (Moyco Union Broach) e giro alternado, sistema M4 (Kerr -USA). A análise da presença de desvios apicais foi realizada por meio de radiografias obtidas na plataforma radiográfica confeccionada para o experimento. Os resultados mostraram não haver diferença estatisticamente significante quanto à avaliação da presença de desvio entre os dois sistemas. Não houve correlação entre o grau de curvatura das raízes e o grau de desvio apical, no sistema de giro contínuo. No entanto, o sistema de giro alternado apresentou diferença estatística de correlação direta e grau médio.

Wear promoted in the apical third of simulated canals after instrumentation with protaper universal system

“…From the obtained results, there was significant interaction between the curve location and the degree of canal curvature, which means, independently on the instrument size (F3, F4 or F5), in point A, canals of 20° presented wear mean smaller than canals of 40°, but in point B this difference was not significant ( Table 2 ). Such fact has been demonstrated in a previous 12 study, where M4 System was used: canals with larger curvature degree showed greater apical wear.…”

CT evaluation of apical canal transportation associated with stainless steel hand files, oscillatory technique and ProTaper rotary system

“…The oscillatory and rotary systems were powered by an electric engine because compressed air-driven systems do not allow torque control and may undergo air pressure variations that might affect the rotational speed and torque (10).…”

Canal Transportation after Root Canal Instrumentation: A Comparative Study with Computed Tomography

“…The crowns were maintained to simulate, as closely as possible, the clinical endodontic practice, in which the interference of cervical dentin projections creates tensions on the files during root canal instrumentation (15). The oscillatory and rotary systems were powered by an electric engine because compressed air-driven systems do not allow torque control and might undergo air pressure variations that might affect the rotational speed and torque (16,17). Measurements were performed in duplicate to check the intra-examiner agreement.…”