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Architectural characteristics of the normal and deformity mandible revealed by three-dimensional functional unit analysis.

 Wonse Park  ;  Bong-Chul Kim  ;  Hyung-Seog Yu  ;  Choong-Kook Yi  ;  Sang-Hwy Lee 
 CLINICAL ORAL INVESTIGATIONS, Vol.14(6) : 691-698, 2010 
Journal Title
Issue Date
Alveolar Process/growth & development ; Alveolar Process/pathology ; Cephalometry/methods* ; Dental Arch/growth & development ; Dental Arch/pathology ; Female ; Humans ; Image Processing, Computer-Assisted/methods ; Imaging, Three-Dimensional/methods* ; Male ; Malocclusion/pathology* ; Malocclusion/physiopathology ; Mandible/abnormalities ; Mandible/growth & development ; Mandible/pathology* ; Mandibular Condyle/growth & development ; Mandibular Condyle/pathology ; Prognathism/pathology ; Prognathism/physiopathology ; Retrognathia/pathology ; Retrognathia/physiopathology ; Tomography, X-Ray Computed/methods ; Young Adult
The 3D architecture of the mandible contributes to the functional and morphological characteristics of the lower one third of craniofacial region. The mandible has six distinct functional units, and its architecture is the sum of balanced growth of each functional unit and surrounding matrix. A dentofacial deformity (DFD) with malocclusion can be interpreted as their unbalanced growth. In order to characterize the mandibular 3D architecture, we analyzed the 3D reconstructed computed tomography (CT) images in terms of functional units. We evaluated both sides of 30 datasets of 3D CT scans of normal controls (N = 6) and patients with prognathic (N = 17) or retrognathic (N = 7) mandibles. We first identified and evaluated reference points to define mandibular functional units and compared their linear and angular measurements of DFD with normal group. The condylar and body length, the ratio of condyle/coronoid length, and the condylar head axis angle showed the statistically significant differences between groups. From these results, we could define the 3D reference points for functional units and identify the 3D architectural characteristics of DFD mandibles. These models may help us improve diagnosis and treatment planning to let them return to the normal and balanced architecture for DFD.
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2. College of Dentistry (치과대학) > Dept. of Orthodontics (교정과학교실) > 1. Journal Papers
2. College of Dentistry (치과대학) > Dept. of Oral and Maxillofacial Surgery (구강악안면외과학교실) > 1. Journal Papers
2. College of Dentistry (치과대학) > Dept. of Advanced General Dentistry (통합치의학과) > 1. Journal Papers
Yonsei Authors
Park, Wonse(박원서) ORCID logo https://orcid.org/0000-0002-2081-1156
Yu, Hyung Seog(유형석) ORCID logo https://orcid.org/0000-0002-1275-5078
Lee, Sang Hwy(이상휘) ORCID logo https://orcid.org/0000-0002-9438-2489
Yi, Choong Kook(이충국)
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