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Abstract

Objective: Dentofacial abnormalities, such as bimaxillary protrusion, can be distressing both socially and psychologically. The aim of this study is to identify the cephalometric features of bimaxillary protrusion and highlight the measurements that characterize bimaxillary protrusion when compared to a normal occlusion group. Materials and methods: Lateral cephalograms of 60 pretreated bimaxillary protrusion young adults were compared with 60 untreated young adults with normal occlusion. Male and female were equal in each group. Thirty-two landmarks were identified for 61 skeletal, dental and soft tissue parameters. The differences between the two groups were analyzed by means of Student’s t-test and two-way ANOVA. Results: There were morphological features in the bimaxillary protrusion group. In the bimaxillary protrusion group, the sagittal jaw relationship was skeletal Class II condition with increased ANB. The maxilla was found to be more prognathic in the bimaxillary protrusion group and the length of the maxilla was significantly longer than the controls. There was no significant difference in the sagittal position of the mandible between the two groups. The mandibular plane angle was more obtuse with downward and backward rotation. The chin was more retrusive on the bimaxillary protrusion group. Divergent facial pattern was found in the bimaxillary protrusion group with longer lower anterior facial height. The maxillary and mandibular incisors were proclined and protrusive, and the interincisal angle was smaller than the controls. The sagittal positions of maxillary and mandibular first molars were more protrusive with more upright angulation. The vertical position of the incisors and first molars were longer than the controls. Conclusion: The characteristics of dentofacial morphology in bimaxillary protrusion group do differ from those in normal occlusion group.

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