الفهرس 
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Abstract
The study aimed to investigate the effect of simultaneous intrusion, retraction (SIR) using mini-implant supported 3-piece Burstone base arch on maxillary central and lateral incisors through segmental cone-beam computed tomography (CBCT). Sixteen patients of 17.9±1.94 years mean age with class II division 1 malocclusion, deep bite ≥4mm and overjet from 5-8mm were selected for the study. Bracket head type mini-implants were inserted between the maxillary second premolar and first permanent molar. After maxillary canine retraction, SIR of maxillary incisors was begun using mini-implant supported 3-piece Burstone arch. Segmental CBCT of high resolution was taken before and after SIR of the maxillary four incisors. Data were collected and analyzed using Paired t test, ANOVA test, independent sample t test and Pearson’s correlation test. All mini-implants showed good stability during treatment with no looseness. The center of resistance (CRe) of the four maxillary incisors was retracted 2.38±0.77mm and intruded 2.76±1.00mm with a mean change in axial inclination of 9.76±3.45°. The mean amount of root resorption of the four incisors was found to be 1.29±0.59mm over a mean period of 6.2months. The study concluded that the mini-implant supported Burstone 3-piece base arch had a pronounced effect on SIR of flared maxillary incisors with clinical insignificant amount of root resorption.