Document Type : Original Article
Authors
Assistant Professor, Department of Orthodontics, School of Dentistry, Shiraz University of Medical Sciences
Abstract
Statement of Problem: The dentoskeletal characteristics of the Class II Division 1 patients dictate their treatment plan and mechanotherapy.Purpose: This study was undertaken to describe the dentofacial characteristics of this type of malocclusion in 8-13 year-old children in Fars Province.Materials and Method: The materials examined included 693 lateral head radiographs comprising two series of 213 films of normal occlusion children and 480 films of Class II Division 1 patients reffered to Orthodontic Department of Shiraz Dental School, taken during the years 2002 to 2004. The controls and the Class II Division 1 subjects were each divided into three groups according to age including 10-11, 12-13 and 14-15 and then divided into two subgroups according to gender. The radiographs were converted into computer-readable X and Y coordinate data and 36 linear and 15 angular measurements in the cranial base, maxilla, mandible and dentition, were provided (based on 35 points) and compared.Results: The statistical analysis showed that the anterior cranial base was larger and more protrusive, with an increase in cranial base angle compared with controls. The mandible was smaller and its form and position was different from controls whereas, the maxilla (at the level of palate and alveolus) and the dentition were protrusive. The palate was inclined superiorly at its anterior half. The vertical maxillary exess and the increase of mid-facial convexity were visible.Conclusion: Various factors ranging from mandibular deficiency to maxillary protrusion with different dental configurations were responsible for the presence of Class II Division 1 malocclusion in our patients.Key words: Class II Division 1, Malocclusion, Dentofacial, Children, Fars Province
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