Abstract
Undetected extra roots or root canals are a major reason for failure of endodontic treatment. Failure to recognize an extra distolingual (DL) root in mandibular first molar may lead to incomplete debridement of the root canal system and eventually treatment failure. Therefore, it is crucial that atypical anatomy is identified before and during dental treatment. Spiral computed tomography (SCT) images can show 3D images, and therefore much detail can be used when traditional methods prevent adequate endodontic treatment. The overall incidence of DL roots on the mandibular first molars was 6.40% for all patients and 5.00% for all teeth, respectively. The occurrence of DL roots on the right side and on the left side showed a statistically significant difference. The bilateral incidence of symmetrical distribution of DL roots was 56.25%. The DL root canal orifice was separated from DB canal orifice by 2.79 ± 0.34 mm, from the MB canal orifice by 4.23 ± 0.81 mm, and from the ML canal orifice by 3.29 ± 0.52 mm. The high prevalence of the DL root in permanent mandibular first molars among the Indian population by using SCT and estimations of the interorifice distance of such teeth might be useful for successful endodontic treatments.
Highlights
The treatment of the entire root canal system is essential to maximize the possibility of success in endodontic therapy
An radix entomolaris (RE) can be found in the first, second and third mandibular molars, occurring least frequently in the second molar [4]. This extra root is typically smaller than the distobuccal root and is usually curved, requiring special attention when root canal treatment is being considered for such a tooth [2,3,4]
Among Whites, RE is not very common [20] and is considered to be unusual or dysmorphic root morphology. The purpose of this retrospective study was to determine the incidence of DL roots in mandibular first molars, their gender and side-related differences, and evaluate their morphology among the Indian population, identified by Spiral computed tomography (SCT)
Summary
The treatment of the entire root canal system is essential to maximize the possibility of success in endodontic therapy. An RE can be found in the first, second and third mandibular molars, occurring least frequently in the second molar [4] This extra root is typically smaller than the distobuccal root and is usually curved, requiring special attention when root canal treatment is being considered for such a tooth [2,3,4]. In Populations with Mongoloid traits such as Chinese, Taiwanese, Eskimo, Korean, and American Indians, DL roots occur with a frequency of 5%–40% [4, 13,14,15,16,17,18,19] This indicates a high ethnic variation among different groups. The purpose of this retrospective study was to determine the incidence of DL roots in mandibular first molars, their gender and side-related differences, and evaluate their morphology among the Indian population, identified by SCT
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