Abstract : This study aimed to evaluate changes of dental arch dimensions resulted by maxillary total arch distalization using the casted palatal plate versus buccal miniscrews. In course of an evaluating of skeletal and dentoalveolar changes after maxillary total arch distalization, cast models of 40 adult patients (7 males and 33 females; average age 20 ± 3.1 years) with class II occlusal relationships were analyzed. Patients were divided according to the anchorage appliance into two equal groups; in the first group (n=20), patients received the newly developed casted palatal plate, while in the second group (n =20), buccal miniscrews were applied. Occlusal changes (overjet, overbite and severity of class II molar and canine relationships), anterior upper arch length, arch widths and palatal height, in addition to molars rotation were measured. Total arch distalization resulted in a significant correction of class II relationships and reduction of overjet in both groups. The interpremolar and intermolar widths increased significantly (3.03 and 4.23 mm, respectively in the miniscrews group, 1.73 and 1.63 mm, respectively in the plate group). The intercanine width increased in the miniscrews group (by 1.70 mm), while it did not change in the plate group. The mesial buccal cusps of molars showed a significant distobuccal rotation. Total arch distalization using each of the casted plate and buccal miniscrews as skeletal anchorage appliances can be an effective non-extraction treatment modality for the correction of class II malocclusion. However, larger amount of upper arch expansion can be associated with the application of buccal miniscrews.