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
RESUMEN
Intercanine width, intermolar width and arch length are essential for diagnosis and treatment planning and are closely related factors in orthodontics.The purpose of this study was to determine the correlation between these measurements and how these measurements are related to each other. Dental casts of 100 orthodontic patients [72 females and 28 males] with a mean age of 18.7 years [12-38 years] in the permanent dentition attending the orthodontic department of the University of Lahore, Lahore, Pakistan were randomly selected. The casts were photocopied 1/1 with maximum contrast. Measurements were made on the photocopies of the upper and lower dental casts. Correlation between variables was determined using spearman's rho correlation coefficient. The data showed very high correlation between intercanine width and intermolar width of both upper and lower arches and a weak correlation was observed between upper intercanine width and upper arch length as well as lower arch length. Correlation was significant between upper and lower arch lengths