ABSTRACT
The aim of this study was to assess soft tissue profile changes concurrent with therapeutic extraction regimes among three different types of malocclusion groups; bixamillary protrusion, crowding, and class II division 1. A sample of 33 female patients with age ranging between 17 and 25 years were divided into three groups [11 each] according to one of the above-mentioned types of malocclusion. Angular and linear cephalometric measurements were done to assess the soft tissue changes and correlate them to dentoalveolar changes secondary to the fixed orthodontic treatment. It was concluded that no significant correlation exists between change in upper incisor inclination and in upper lip position in any of the groups. Change in lower incisor inclination post treatment was found to correlate significantly with change in mento labial angle in the class II division 1 group. Change in lower incisor inclination post treatment was found to correlate significantly with change in distance between upper lip and E line in the bimaxillary protrusion group. In bimaxillary protrusion group, amount of upper lip retraction, lower lip retraction, lower incisor retraction, and upper incisor retraction were significantly higher than the crowding group. Upper lip length increase was significantly higher in the bimaxillary as compared with the other two groups