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Cone-Beam Computed Tomography Study of Incidence of Distolingual Root and Distance from Distolingual Canal to Buccal Cortical Bone of Mandibular First Molars in a Korean Population

Published:January 16, 2012DOI:https://doi.org/10.1016/j.joen.2011.10.023

      Abstract

      Introduction

      The purpose of this study was to investigate the incidence of separate distolingual (DL) root and separate DL canal in 1 distal root and to measure the distance from distobuccal (DB) and DL canal to buccal cortical bone of mandibular first molars in a Korean population by using cone-beam computed tomography images.

      Methods

      Screening identified 1400 subjects with bilateral permanent mandibular first molars for inclusion in this investigation. The incidences of separate DL root (distal 2 roots with 1 canal for each root, 2 roots 2 canals [2R2C]) and separate DL canal in 1 distal root (distal 1 root with 2 separate canals, 1 root 2 canals [1R2C]) were investigated. The distances from DL canal to buccal cortical bone and from DB canal to buccal cortical bone were measured.

      Results

      The incidence of 2R2C was 26.6% (373 of 1400) on the right side and 19.0% (266 of 1400) on the left side, with a statistically significant difference (P < .001). The incidence of 1R2C was 3.5% (49 of 1400) on the right side and 4.5% (63 of 1400) on the left side. Mean distance from DB canal to buccal cortical bone was 3.37 mm in 2R2C (n = 639) and 4.17 mm in 1R2C (n = 112). Mean distance from DL canal to buccal cortical bone was 8.63 mm in 2R2C and 7.19 mm in 1R2C. Statistical difference was detected between 2R2C and 1R2C for both DB and DL canals (P < .001 and P < .001, respectively).

      Conclusions

      Separate DL root is common in the mandibular first molar in a Korean population. Knowledge of the occurrence of DL root and buccal bone thickness can improve the success rate of endodontic microsurgery.

      Key Words

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      References

        • Song J.S.
        • Choi H.J.
        • Jung I.Y.
        • Jung H.S.
        • Kim S.O.
        The prevalence and morphologic classification of distolingual roots in the mandibular molars in a Korean population.
        J Endod. 2010; 36: 653-657
        • Wang Y.
        • Zheng Q.H.
        • Zhou X.D.
        • et al.
        Evaluation of the root and canal morphology of mandibular first permanent molars in a western Chinese population by cone-beam computed tomography.
        J Endod. 2010; 36: 1786-1789
        • Tu M.G.
        • Tsai C.C.
        • Jou M.J.
        • et al.
        Prevalence of three-rooted mandibular first molars among Taiwanese individuals.
        J Endod. 2007; 33: 1163-1166
        • Chen Y.C.
        • Lee Y.Y.
        • Pai S.F.
        • Yang S.F.
        The morphologic characteristics of the distolingual roots of mandibular first molars in a Taiwanese population.
        J Endod. 2009; 35: 643-645
        • De Moor R.J.
        • Deroose C.A.
        • Calberson F.L.
        The radix entomolaris in mandibular first molars: an endodontic challenge.
        Int Endod J. 2004; 37: 789-799
        • Lin L.
        • Skribner J.
        • Shovlin F.
        • Langeland K.
        Periapical surgery of mandibular posterior teeth: anatomical and surgical considerations.
        J Endod. 1983; 9: 496-501
        • Frankle K.T.
        • Seibel W.
        • Dumsha T.C.
        Anatomical study of the position of the mesial roots of mandibular molars.
        J Endod. 1990; 16: 480-485
        • Gutmann J.L.
        • Harrison J.W.
        Posterior endodontic surgery: anatomical considerations and clinical techniques.
        Int Endod J. 1985; 18: 8-34
        • Cotton T.P.
        • Geisler T.M.
        • Holden D.T.
        • Schwartz S.A.
        • Schindler W.G.
        Endodontic applications of cone-beam volumetric tomography.
        J Endod. 2007; 33: 1121-1132
        • Tu M.G.
        • Huang H.L.
        • Hsue S.S.
        • et al.
        Detection of permanent three-rooted mandibular first molars by cone-beam computed tomography imaging in Taiwanese individuals.
        J Endod. 2009; 35: 503-507
        • Patel S.
        • Dawood A.
        • Ford T.P.
        • Whaites E.
        The potential applications of cone beam computed tomography in the management of endodontic problems.
        Int Endod J. 2007; 40: 818-830
        • Matherne R.P.
        • Angelopoulos C.
        • Kulild J.C.
        • Tira D.
        Use of cone-beam computed tomography to identify root canal systems in vitro.
        J Endod. 2008; 34: 87-89
        • Nair M.K.
        • Nair U.P.
        Digital and advanced imaging in endodontics: a review.
        J Endod. 2007; 33: 1-6
        • Cotton T.P.
        • Geisler T.M.
        • Holden D.T.
        • Schwartz S.A.
        • Schindler W.G.
        Endodontic applications of cone-beam volumetric tomography.
        J Endod. 2007; 33: 1121-1132
        • Gulabivala K.
        • Opasanon A.
        • Ng Y.L.
        • Alavi A.
        Root and canal morphology of Thai mandibular molars.
        Int Endod J. 2002; 35: 56-62
        • Song J.S.
        • Kim S.O.
        • Choi B.J.
        • Choi H.J.
        • Son H.K.
        • Lee J.H.
        Incidence and relationship of an additional root in the mandibular first permanent molar and primary molars.
        Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 2009; 107: e56-e60
        • Walker R.T.
        • Quackenbush L.E.
        Three-rooted lower first permanent molar in Hong Kong Chinese.
        Br Dent J. 1985; 159: 298-299
        • Loh H.S.
        Incidence and features of three-rooted permanent mandibular molars.
        Aust Dent J. 1990; 35: 434-437
        • Curzon M.E.
        Three-rooted mandibular permanent molars in English Caucasians.
        J Dent Res. 1973; 52: 181
        • Huang R.Y.
        • Cheng W.C.
        • Chen C.J.
        • et al.
        Three-dimensional analysis of the root morphology of mandibular first molars with distolingual roots.
        Int Endod J. 2010; 43: 478-484
        • Huang C.C.
        • Chang Y.C.
        • Chuang M.C.
        • et al.
        Evaluation of root and canal systems of mandibular first molars in Taiwanese individuals using cone-beam computed tomography.
        J Formos Med Assoc. 2010; 109: 303-308
        • Choi Y.H.
        • Bae J.H.
        Clinical evaluation of new extraction method for intentional replantation.
        J Kor Acad Cons Dent. 2011; 36: 211-218
        • Misch C.E.
        • Perez H.M.
        Atraumatic extractions: a biomechanical rationale.
        Dent Today. 2008; 27: 100-101