Different bone anchored maxillary protraction (BAMP) protocols were introduced in the last few years for the treatment of growing Class III. Mini-implant stability is the most critical point controlling the success of bone anchorage in orthodontics. To evaluate the success rate of miniscrew anchorage for bone anchored maxillary protraction. Twenty patients (11.4±1.3 years; range, 9.5-13.2 years) with maxillary hypoplasia without clefts or craniofacial anomalies were recruited in this study. All participants received a miniscrew supported hyrax expander (hybrid hyrax) that was activated by Alt-RAMEC protocol for 9 weeks. A miniscrew anchored mandibular bar was delivered for each case acting as attachment for full time Class III elastics (200 g). Maxillary protraction was ceased when achieving positive overjet. A total of 80 miniscrews (maxilla, 40; mandible, 40) were placed by the same operator. Miniscrew success rate was analyzed for insertion site and gender using Fisher’s exact test at 5% level of significance. ResultMaxillary protraction was achieved in all cases within 12.2±2.1 months. There was no significant correlation (p > 0.05) between gender nor insertion site and miniscrew failure. Success rate was 97.5% for the palatal screws and 87.5%for the mandibular interradicular screws. Skeletal anchorage by miniscrews is effective for BAMP. Palatal miniscrews were more successful than mandibular interradicular screws, but the difference was not significant.
