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The prevalence and morphologic classification of distolingual roots in the mandibular molars in a Korean population

 Je Seon Song  ;  Hyung-Jun Choi  ;  Il-Young Jung  ;  Han-Sung Jung  ;  Seong-Oh Kim 
 JOURNAL OF ENDODONTICS, Vol.36(4) : 653-657, 2010 
Journal Title
Issue Date
Adolescent ; Adult ; Aged ; Asian Continental Ancestry Group* ; Chi-Square Distribution ; Child ; Child, Preschool ; Classification ; Dental Pulp Cavity/anatomy & histology* ; Dental Pulp Cavity/diagnostic imaging ; Female ; Humans ; Imaging, Three-Dimensional ; Korea ; Logistic Models ; Male ; Mandible ; Middle Aged ; Molar/anatomy & histology* ; Molar/diagnostic imaging ; Odontometry ; Retrospective Studies ; Tomography, X-Ray Computed ; Tooth Root/anatomy & histology* ; Tooth Root/diagnostic imaging ; Young Adult
Concurrency ; distolingual root ; mandibular molars ; morphologic features ; occurrence
INTRODUCTION: The aims of this study were to determine the incidence and concurrency rate of distolingual (DL) roots on mandibular molars and to classify them according to their morphologic features. METHODS: Serial cross-sectional computed tomography images of the mandibles were collected retrospectively from 1,775 Korean patients of Mongoloid origin. The incidence of DL roots was calculated for each molar, and their patterns of concurrence were analyzed with the Fisher exact test. DL roots were categorized into five groups according to their morphologic characteristics using the three-dimensional reconstructed images. RESULTS: The incidence rate of DL roots was highest for first molars (24.5%) and lowest for second molars (0.7%). They were often present concurrently in adjacent molars (p < 0.004). The morphologic characteristics of DL roots in the first molars varied greatly from a severely curved type (type III, 40.5%) to an underdeveloped small type or a conical type (2.5% and 1.4%, respectively). CONCLUSION: Data regarding the pattern of occurrence and the morphologic features of DL roots can provide useful information to clinicians, leading to higher rate of success of endodontic treatment.
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2. College of Dentistry (치과대학) > Dept. of Pediatric Dentistry (소아치과학교실) > 1. Journal Papers
2. College of Dentistry (치과대학) > Dept. of Conservative Dentistry (보존과학교실) > 1. Journal Papers
2. College of Dentistry (치과대학) > Dept. of Oral Biology (구강생물학교실) > 1. Journal Papers
Yonsei Authors
Kim, Seong Oh(김성오) ORCID logo https://orcid.org/0000-0002-8620-1377
Song, Je Seon(송제선) ORCID logo https://orcid.org/0000-0001-8620-5629
Jung, Il Young(정일영) ORCID logo https://orcid.org/0000-0001-8972-2664
Jung, Han Sung(정한성) ORCID logo https://orcid.org/0000-0003-2795-531X
Choi, Hyung Jun(최형준) ORCID logo https://orcid.org/0000-0002-3315-6912
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