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A biometric study of C-shaped root canal systems in mandibular second molars using cone-beam computed tomography.
Int Endod J. 2012 Sep; 45(9):807-14.IE

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.

Authors+Show Affiliations

Department of Conservative Dentistry and Dental Research Institute, Seoul National University Dental Hospital, Seoul National University School of Dentistry, Seoul, Korea.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

22432971

Citation

Seo, D-G, et al. "A Biometric Study of C-shaped Root Canal Systems in Mandibular Second Molars Using Cone-beam Computed Tomography." International Endodontic Journal, vol. 45, no. 9, 2012, pp. 807-14.
Seo DG, Gu Y, Yi YA, et al. A biometric study of C-shaped root canal systems in mandibular second molars using cone-beam computed tomography. Int Endod J. 2012;45(9):807-14.
Seo, D. G., Gu, Y., Yi, Y. A., Lee, S. J., Jeong, J. S., Lee, Y., Chang, S. W., Lee, J. K., Park, W., Kim, K. D., & Kum, K. Y. (2012). A biometric study of C-shaped root canal systems in mandibular second molars using cone-beam computed tomography. International Endodontic Journal, 45(9), 807-14. https://doi.org/10.1111/j.1365-2591.2012.02037.x
Seo DG, et al. A Biometric Study of C-shaped Root Canal Systems in Mandibular Second Molars Using Cone-beam Computed Tomography. Int Endod J. 2012;45(9):807-14. PubMed PMID: 22432971.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - A biometric study of C-shaped root canal systems in mandibular second molars using cone-beam computed tomography. AU - Seo,D-G, AU - Gu,Y, AU - Yi,Y-A, AU - Lee,S-J, AU - Jeong,J-S, AU - Lee,Y, AU - Chang,S-W, AU - Lee,J-K, AU - Park,W, AU - Kim,K-D, AU - Kum,K-Y, Y1 - 2012/03/20/ PY - 2012/3/22/entrez PY - 2012/3/22/pubmed PY - 2013/3/13/medline SP - 807 EP - 14 JF - International endodontic journal JO - Int Endod J VL - 45 IS - 9 N2 - 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. SN - 1365-2591 UR - https://www.unboundmedicine.com/medline/citation/22432971/A_biometric_study_of_C_shaped_root_canal_systems_in_mandibular_second_molars_using_cone_beam_computed_tomography_ L2 - https://doi.org/10.1111/j.1365-2591.2012.02037.x DB - PRIME DP - Unbound Medicine ER -