Three-dimensional evaluation of skeletal and dental asymmetries in Class II subdivision malocclusions

The objective of this study was to determine if any significant differences existed with regard to dental and skeletal asymmetries between subjects with Angle Class II subdivision malocclusions and subjects with normal occlusions. The sample consisted of 30 subjects in each of the 2 groups. Each pos...

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Published in:American journal of orthodontics and dentofacial orthopedics 2001-04, Vol.119 (4), p.406-418
Main Authors: Janson, Guilherme R.P., Metaxas, Angelos, Woodside, Donald G., de Freitas, Marcos Roberto, Pinzan, Arnaldo
Format: Article
Language:English
Subjects:
Adolescent
Adult
Cephalometry - methods
Chin - pathology
Dental Arch - pathology
Dental Occlusion
Dentistry
Facial Asymmetry - pathology
Facial Bones - pathology
Female
Humans
Logistic Models
Male
Malocclusion, Angle Class II - pathology
Mandible - pathology
Mandibular Condyle - pathology
Maxilla - pathology
Molar - pathology
Multivariate Analysis
Skull Base - pathology
Tooth - pathology
Zygoma - pathology
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Summary:The objective of this study was to determine if any significant differences existed with regard to dental and skeletal asymmetries between subjects with Angle Class II subdivision malocclusions and subjects with normal occlusions. The sample consisted of 30 subjects in each of the 2 groups. Each possessed a full complement of permanent teeth, including first molars. The average age of subjects was 15.76 years in the Class II subdivision group and 22.42 years in the normal occlusion group. Measurements were obtained with the use of submentovertex, posteroanterior, and corrected oblique cephalometric radiographs. In the submentovertex radiographs, symmetry was assessed by measuring the relative differences in the spatial positions of dental and skeletal landmarks between the right and the left sides in both anteroposterior and transverse dimensions. Coordinate systems were used to represent the mandible, cranial floor, and the maxilla. In the posteroanterior radiographs, symmetry was assessed similarly by measuring the relative differences in the spatial positions of dental and skeletal landmarks between the right and the left sides. In the corrected oblique radiographs, symmetry was assessed by measuring the differences in size of dental and skeletal structures between the right and the left sides. Variables were analyzed with multivariate logistic regression analysis. The results demonstrated that the primary contributor to the differences between the 2 groups was the distal positioning of the mandibular first molars on the Class II side in patients whose mandibles showed no unusual skeletal or positional asymmetries. A secondary contributor was the mesial positioning of the maxillary first molars on the Class II side. Furthermore, the posteroanterior radiographic analysis showed that the more frequent distal positioning of the mandibular molars on the Class II side, compared with the mesial positioning of the maxillary molars on that side resulted in mandibular dental midline deviation to the Class II side more frequently than the maxillary dental midline to the opposite side. (Am J Orthod Dentofacial Orthop 2001;119:406-18)
ISSN:0889-5406
1097-6752
DOI:10.1067/mod.2001.113267