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http://dx.doi.org/10.14368/jdras.2014.30.3.215

Morphological difference of symphysis according to various skeletal types using cone-beam computed tomography  

Kwon, Hyun-Jin (Graduate School of Clinical Dentistry, Ewha Womans University)
Chun, Youn-Sic (Graduate School of Clinical Dentistry, Ewha Womans University)
Kim, Min-Ji (Graduate School of Clinical Dentistry, Ewha Womans University)
Publication Information
Journal of Dental Rehabilitation and Applied Science / v.30, no.3, 2014 , pp. 215-222 More about this Journal
Abstract
Purpose: The aim of this study was to investigate differences between the morphology of the mandibular symphysis and four facial skeletal types. Materials and Methods: 40 cone-beam computed tomographies were selected and classified in to 4 groups according to their vertical and anterior-posterior skeletal patterns. The bone volume ($mm^3$) of the symphysis, the cross sectional area corresponding to the 4 mandibular incisors' axis: the cross sectional area of total bone ($mm^2$), the area of the cancellous bone ($mm^2$) and the thickness (mm) of labial and lingual alveolar bone at 2 mm, 3 mm under the cemento-enamel junction (CEJ) were measured. General linear model (GLM), Kruskal-Wallis test and Tukey honestly significant difference (HSD) test were subsequently used for statistical analysis. Results: The lingual cortical bone thickness of the lateral incisors at 2, 3 mm under CEJ was greater in the Class I low angle group than the other 3 groups (P < 0.05). There were no statistically significant differences in the volume of the mandibular incisor bony support, cross-sectional area of total bone and cancellous bone at the mandibular incisor' axis. Conclusion: Patients in Class I, low angle group have a thicker lingual mandibular symphysis than Class I, high angle patients.
Keywords
facial skeletal type; mandibular symphysis; CBCT; volume of mandibular symphysis;
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