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KMID : 1004520140300030215
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Journal of Dental Rehabilitation and Applied Science
2014 Volume.30 No. 3 p.215 ~ p.222
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Morphological difference of symphysis according to various skeletal types using cone-beam computed tomography
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Kwon Hyun-Jin
Chun Youn-Sic
Kim Min-Ji
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Abstract
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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 (mm3) of the symphysis, the cross sectional area corresponding to the 4 mandibular incisors’ axis: the cross sectional area of total bone (mm2), the area of the cancellous bone (mm2) 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.
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KEYWORD
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facial skeletal type, mandibular symphysis, CBCT, volume of mandibular symphysis
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