Abstract
OBJECTIVE: This in vitro study aimed to evaluate preparation time, wear, transportation, and centering ability of two manual instruments, namely Flexofile and Prodesign® M, in curved root canal preparation.METHODS: Forty mesiobuccal and mesiolingual canals of the first or second lower molars were used, with standard length, degree, and radius of curvature among all samples. The canals were randomly divided into two experimental groups (n=20) according to the preparation instrument analyzed. The preparations were performed by a single operator. The preparation time was controlled, and the values obtained were analyzed. To verify the wear, transportation, and centering ability of the instruments, tomography images were taken before and after instrumentation. The analysis was performed using axial sections previously identified at 2 mm below the tooth apex with the aid of the OnDemand3DTM Dental program. For statistical analysis, Student’s t-test was used, with a significance level of 5%.RESULTS: The time required to prepare root canals was lesser using Prodesign® M instruments than using Flexofile instruments. Regarding tooth wear, no statistical difference was observed. However, Flexofile instruments had a low centralization capacity in root canal preparation, and there is a trend of transport in the mesial direction of the root canal.CONCLUSION: Although no statistical difference was observed between the two instruments, the Prodesign® M instruments had a better cantering ability in the preparation. As well as, the time required to prepare the root canals was inferior when Prodesign® M was used.
Highlights
An objective of endodontic preparation is to maintain a root canal in a progressive conical shape by preserving the original anatomical curvature and the position of the apical foramen [1].Accidents such as deviations, zips, and root perforations can occur in root canal preparation [2]
Technical knowledge and good command over endodontic instruments are fundamental for reducing accidents, providing greater precision in treatment, and reducing working time [3]
Many endodontic instruments such as stainless steel hand instruments have been commercialized for root canal preparation and are increasingly used by dentists since 1963 [4]
Summary
An objective of endodontic preparation is to maintain a root canal in a progressive conical shape by preserving the original anatomical curvature and the position of the apical foramen [1].Accidents such as deviations, zips, and root perforations can occur in root canal preparation [2]. An objective of endodontic preparation is to maintain a root canal in a progressive conical shape by preserving the original anatomical curvature and the position of the apical foramen [1]. Technical knowledge and good command over endodontic instruments are fundamental for reducing accidents, providing greater precision in treatment, and reducing working time [3]. Many endodontic instruments such as stainless steel hand instruments have been commercialized for root canal preparation and are increasingly used by dentists since 1963 [4]. Pettiette et al [5] and Leonardi et al [2] verified that the rigidity of stainless steel instruments directly influenced the occurrence of accidents
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