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A Cone-beam Computed Tomography Study of the Root Canal Morphology of Mandibular First Premolars and the Location of Root Canal Orifices and Apical Foramina in a Chinese Subpopulation

  • Haibing Yang
    Affiliations
    Department of Endodontics, School of Stomatology, Shandong University, Shandong Provincial Key Laboratory of Oral Biomedicine, Jinan, China

    Department of Stomatology, the Affiliated Hospital of Nanjing Medical University, Changzhou No. 2 People's Hospital, Changzhou, China
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  • Cheng Tian
    Affiliations
    Department of Endodontics, School of Stomatology, Shandong University, Shandong Provincial Key Laboratory of Oral Biomedicine, Jinan, China
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  • Guoju Li
    Affiliations
    Department of Oral Radiology, School of Stomatology, Shandong University, Shandong Provincial Key Laboratory of Oral Biomedicine, Jinan, China
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  • Lin Yang
    Affiliations
    Department of Endodontics, School of Stomatology, Shandong University, Shandong Provincial Key Laboratory of Oral Biomedicine, Jinan, China
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  • Xuan Han
    Affiliations
    Department of Endodontics, School of Stomatology, Shandong University, Shandong Provincial Key Laboratory of Oral Biomedicine, Jinan, China
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  • Yan Wang
    Correspondence
    Address requests for reprints to Dr Yan Wang, Department of Endodontics, School and Hospital of Stomatology, Shandong University, 44-1 Wenhua Xi Road, Jinan, 250012 P.R. China.
    Affiliations
    Department of Endodontics, School of Stomatology, Shandong University, Shandong Provincial Key Laboratory of Oral Biomedicine, Jinan, China
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Published:January 18, 2013DOI:https://doi.org/10.1016/j.joen.2012.11.003

      Abstract

      Introduction

      Successful root canal treatment is dependent on detailed knowledge of the morphology of the root canal system. The aim of this study was to investigate the morphology of the root canal systems of mandibular first premolars and the location of root canal orifices and apical foramina in a Chinese subpopulation using cone-beam computed tomography scanning.

      Methods

      A total of 440 cone-beam computed tomographic images of mandibular first premolars were obtained from 238 patients. Tooth position, root canal morphology, the distance between the apical foramen and the anatomic apex, and the distance between the 2 root canal orifices of mandibular first premolars with 2 root canals were investigated. The Fisher exact test was used to analyze the correlation between the number of root canals and tooth position.

      Results

      Overall, 1.14% (n = 5) of the teeth had a C-shaped root canal system, 77.14% (n = 335) had 1 root canal, and 22.05% (n = 97) had 2 root canals from type II to type V. The remaining 0.68% (n = 3) were classified as type VIII, which had 3 root canals. The most frequent distribution of the distance between the apical foramen and the anatomic apex in 335 mandibular first premolars with 1 root canal was 1–2 mm (n = 192). The distance between the apical foramen and the anatomic apex of mandibular first premolars with 2 root canals was in accord with that of mandibular first premolars with 1 root canal. The distance between the 2 root canal orifices of mandibular first premolars with 2 root canals was approximately 13 mm.

      Conclusions

      Most mandibular first premolars had 1 root canal. More than 1 of 5 mandibular first premolars had complex root canal systems (with 2 or more root canals). This study provides supplemental information about the root canals of mandibular first premolars in a Chinese subpopulation.

      Key Words

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