Abstract
Objective To observe the clinical effects of PASS appliance (Physiclogic Anchorage Control appliance) in the treatment of Class II division 1 patients. Methods 20 patients with Class II division 1 malocclusion were extracted 4 first premolars and treated with PASS appliance. Cephalometric analysis was carried out before and after treatment. Results The average treatment time was 16.2 months. After treatment, ANB angle, U1-SN, U1-NA , L1-NB, overbite and overjet decreased by 0.99°, 16.06°, 7.13 mm, 2.01 mm, 1.99 mm and 6.88 mm, respectivelt. U1-L1 increased by 14.6°. Significant difference was found in all measurements before and after treatment. Conclusions PASS appliance could be effectively used in the treatment of ClassⅡ1 patients. Key words: PASS appliance; AngleⅡ1 malocclusion; Cephalometric measurements; Soft tissue profile
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