The Incidence of Dentinal Crack Formation During Root Canal Treatment by Three Different File Systems In Vitro Study

Abstract

Root canal preparation using NiTi instruments could damage the dentinal wall. Dentinal defects are in the form of cracks either complete or incomplete cracks, these cracks could lead to areas of stress concentration and vertical root fracture. The aim of this study was to compare the incidence of dentinal crack formation after root canal preparation with ProTaper Next, ProTaper Gold and TruNatomy rotary instruments. Ninety five freshly extracted human lower first molars were collected for this study, the degree of mesial root curvature was measured for every tooth before they were distributed evenly among the experimental groups. Access cavity was done for each tooth, length was determined before instrumentation and mesio-buccal canals were instrumented by ProTaper Next, ProTaper Gold and TruNatomy files.