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A biometric study of C-shaped root canal systems in mandibular second molars using cone-beam computed tomography.

Authors
 D.-G. Seo  ;  Y. Gu  ;  Y.-A. Yi  ;  S.-J. Lee  ;  J.-S. Jeong  ;  Y. Lee  ;  S.-W. Chang  ;  J.-K. Lee  ;  W. Park  ;  K.-D. Kim  ;  K.-Y. Kum 
Citation
 INTERNATIONAL ENDODONTIC JOURNAL, Vol.45(9) : 807-814, 2012 
Journal Title
 INTERNATIONAL ENDODONTIC JOURNAL 
ISSN
 0143-2885 
Issue Date
2012
MeSH
Adult ; Anatomic Variation* ; Anatomy, Cross-Sectional/statistics & numerical data ; Biometry ; Cone-Beam Computed Tomography/statistics & numerical data* ; Dental Pulp Cavity/anatomy & histology ; Dental Pulp Cavity/diagnostic imaging* ; Humans ; Imaging, Three-Dimensional/methods ; Mandible/diagnostic imaging ; Middle Aged ; Molar/anatomy & histology ; Molar/diagnostic imaging* ; Odontometry/statistics & numerical data ; Republic of Korea ; Retrospective Studies ; Tooth Apex/anatomy & histology ; Tooth Apex/diagnostic imaging ; Tooth Crown/anatomy & histology ; Tooth Crown/diagnostic imaging ; Tooth Root/anatomy & histology ; Tooth Root/diagnostic imaging ; Young Adult
Keywords
cone-beam computed tomography ; con-figuration ; C-shaped canal ; minimum wall thickness ; orientation
Abstract
AIM: To investigate the configuration of C-shaped canals in mandibular second molars, canal wall thickness and the orientation of the thinnest area at 1-mm intervals from the canal orifice to the apex by using cone-beam computed tomographic (CBCT) images. METHODOLOGY: Three-dimensional CBCT images of 92 Korean mandibular second molars having C-shaped root canals were analysed to determine their configuration using a modification of Melton's classification, as well as the thinnest walls and their location. Associations between configuration type and distance from the canal orifice to the apex, as well as associations between the directional orientation of the thinnest root wall and distance from the canal orifice to the apex, were assessed by Fisher's exact test. Because serial measurements of minimum wall thicknesses were correlated with individual teeth, a mixed-effects analysis was applied. RESULTS: The most common configuration types were Melton's type I in the coronal region and Melton's type III in the apical region. Mean thicknesses of the thinnest root canal walls were 1.39 ± 0.38, 0.85 ± 0.25 and 0.77 ± 0.20 mm in the coronal, middle and apical regions, respectively. The thicker the root canal walls at the orifice region, the greater the decrease in thickness towards the apical region (P < 0.05), with the linguo-central root area being the thinnest. The pattern of decreasing thickness from the orifice to the apex formed a nonlinear cubic curve. CONCLUSIONS: The most prevalent configuration types were Melton's type I (coronal region) and type III (apical region). The linguo-central root area was the thinnest in C-shaped root canals of Korean mandibular second molars. These anatomical variations should be considered during surgical or nonsurgical endodontic procedures.
Full Text
http://onlinelibrary.wiley.com/doi/10.1111/j.1365-2591.2012.02037.x/abstract
DOI
22432971
Appears in Collections:
2. College of Dentistry (치과대학) > Dept. of Advanced General Dentistry (통합치의학과) > 1. Journal Papers
Yonsei Authors
Kim, Kee Deog(김기덕) ORCID logo https://orcid.org/0000-0003-3055-5130
Park, Wonse(박원서) ORCID logo https://orcid.org/0000-0002-2081-1156
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/90431
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