Abstract
BackgroundThe aim of this study was to evaluate the root canal morphology of mandibular first molars in a Chinese population by using cone-beam computed tomography (CBCT).MethodsIn this study, CBCT images of 900 mandibular first molars were evaluated for the following details: (1) number of roots, (2) number of apical foramina, (3) frequency distribution of root canal configurations defined in accordance with Vertucci’s classification, and (4) frequency of occurrence of middle mesial (MM) canal.ResultsOverall, 74.9% of the evaluated mandibular first molars possessed two roots, and 55.4% exhibited three apical foramina. The evaluated teeth exhibited a relatively high prevalence of type IV canals in mesial (M) roots (76.8%) and type I canals in the distal (D) (79.4%), distobuccal (DB) (98.7%), and distolingual (DL) (100%) roots. There were no significant differences in the number of roots, incidence of apical foramina, or distribution of different canal configurations of mandibular first molars between men and women (P > 0.05). 1.9% of mandibular first molars possessed three mesial canals, and the highest frequency of occurrence of MM canals (4.1%) was among Chinese people below the age of 30 years.ConclusionsCBCT scanning facilitates identification of the root canal system. In order to increase the success rate of treatment, it is important to obtain information about the variable morphology of root canals before endodontic treatment.Trial registrationTJSKE20160412. Registered 12 April 2016.
Highlights
The aim of this study was to evaluate the root canal morphology of mandibular first molars in a Chinese population by using cone-beam computed tomography (CBCT)
Permanent mandibular first molars exhibit a wide variation in root canal anatomy
Number of roots in mandibular first molars according to sex A total of 900 CBCT images were selected in accordance with the inclusion criteria
Summary
The aim of this study was to evaluate the root canal morphology of mandibular first molars in a Chinese population by using cone-beam computed tomography (CBCT). Permanent mandibular first molars exhibit a wide variation in root canal anatomy. They appear to be the tooth type that most often requires root canal treatment (Silva et al 2013). A common root and canal configuration of mandibular first molars involves two roots with one or two canals in the distal (D) root and two canals in the mesial (M) root, characterized by a widened buccolingual surface and flattened mesiodistal surface (Tian et al 2016).
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