RESUMEN
The study was carried out to evaluate dental changes in pre and post treatment lateral cephalograms in orthodontic individuals treated with extraction of first premolars. Pre and post treatment lateral cephalometric radiographs of 20 patients were taken from orthodontic department, the University of Lahore. These lateral cephalograms were collected from the data present in orthodontic record room from 1/1/ 2007 to 31/12/2012. Inclination of upper and lower incisors were assessed with respect to cranial base, maxilla, mandible and with respect to each other. The results showed a significant change in all dental variables after orthodontic treatment when simple t-test was applied. In case of paired sample t-test, significant change was noted in two variables only which are upper incisor to nasion -point A angle and distance. Orthodontic patients treated with therapeutic extraction showed significant improvements in their dental relationship