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KMID : 1149920120010010001
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Korean Journal of Limgual Orthodontics
2012 Volume.1 No. 1 p.1 ~ p.9
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Transverse Measurements and Their Correlations in the Posteroanterior Cephalometry and 3-dimensional Computed Tomography
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Kim Na-Yeon
Yu Hyung-Seog
Lee Sang-Hwy
Lee Kee-Joon
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Abstract
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Purpose: Th e aim of this study was to fi nd the correlation of transverse measurements obtained from 2-dimensional posteroanterior (PA) cephalogram and 3-dimensional computed tomography (CT).
Methods: The subjects were 40 adult patients (25 males and 15 females, mean age: 22Y 8M) in Yonsei University Hospital with the diagnosis of skeletal Class III malocclusion. Transverse dimensions measured in PA cephalogram were correlated with respective measurements in CT.
Results: Maxillary width (J-J) in PA had signifi cant correlation with all maxillary transverse dimensions in PA and CT, while mandibular width (Ag-Ag) in PA did not show signifi cant relation with mandibular measurements in CT. None of the measurements was found associated with the mandibular 1st molar width (L6a-L6a). Alveolar bone width of Mn canine (L3a-L3a) in CT was correlated with intercanine width of mandible (L3-L3) in PA.
Conclusion: This study indicates that maxillary width (J-J) of PA may represent the maxillary alveolar transverse dimensions in CT, whrereas mandibular width (Ag-Ag) in PA may not be a useful indicator of mandibular basal arch width. Instead, mandibular intercanine width (L3-L3) in PA may represent the alveolar bone width of mandibular canine area.
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KEYWORD
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Transverse measurements, Posteroanterior cephalometry, Computed tomography (CT), Correlation
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