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Three-dimensional evaluation of skeletal and dental asymmetries in Class II subdivision malocclusions.
Am J Orthod Dentofacial Orthop. 2001 Apr; 119(4):406-18.AJ

Abstract

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.

Authors+Show Affiliations

Department of Orthodontics, Bauru Dental School, University of São Paulo, Brazil. jansong@travelnet.com.brNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

11298314

Citation

Janson, G R., et al. "Three-dimensional Evaluation of Skeletal and Dental Asymmetries in Class II Subdivision Malocclusions." American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics, vol. 119, no. 4, 2001, pp. 406-18.
Janson GR, Metaxas A, Woodside DG, et al. Three-dimensional evaluation of skeletal and dental asymmetries in Class II subdivision malocclusions. Am J Orthod Dentofacial Orthop. 2001;119(4):406-18.
Janson, G. R., Metaxas, A., Woodside, D. G., de Freitas, M. R., & Pinzan, A. (2001). Three-dimensional evaluation of skeletal and dental asymmetries in Class II subdivision malocclusions. American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics, 119(4), 406-18.
Janson GR, et al. Three-dimensional Evaluation of Skeletal and Dental Asymmetries in Class II Subdivision Malocclusions. Am J Orthod Dentofacial Orthop. 2001;119(4):406-18. PubMed PMID: 11298314.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Three-dimensional evaluation of skeletal and dental asymmetries in Class II subdivision malocclusions. AU - Janson,G R, AU - Metaxas,A, AU - Woodside,D G, AU - de Freitas,M R, AU - Pinzan,A, PY - 2001/4/12/pubmed PY - 2001/5/18/medline PY - 2001/4/12/entrez SP - 406 EP - 18 JF - American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics JO - Am J Orthod Dentofacial Orthop VL - 119 IS - 4 N2 - 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. SN - 0889-5406 UR - https://www.unboundmedicine.com/medline/citation/11298314/Three_dimensional_evaluation_of_skeletal_and_dental_asymmetries_in_Class_II_subdivision_malocclusions_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0889-5406(01)05318-5 DB - PRIME DP - Unbound Medicine ER -