Evaluation of Dento Facial Vertical Dimension in Class II Division 1 Malocclusion after Premolar Extraction

Introduction: The Purpose of this study was to evaluate dentofacial vertical dimension alteration in patients with class II division 1 malocclusion after the first maxillarypremolar extraction. Methods:This study used 24 cephalogramseach before and after treatment. Dentofacial dimension measured by Sivakumar and Valiathan method. The cephalometric measurements investigated were as follows : mandibular plane angle, anterior facial height, lower anterior facial height, posterior facial height, facial height indeks, FH-U1, FH-U6, FL-L1, Fl-L6, Svertical-U1, Svertical-U6, Pogvertical-L1, Pogvertical-L6. To determine dento facial vertical dimension changes due to treatment paired t-test were performed, respectively. Results: There was no change in the vertical dimension of dento-skeletal significantly between before and after treatment except on the posterior facial height ,FL-L1, and Svertical-U1. Conclusion: The results showed that in patients treated with extraction of two premolars, there was a significant decrease in following cephalometric measurement: the posterior facial height, FL-LI and Svertical-U1. Keyword: Class II division 1, dentofacial vertical dimension, premolar extraction