Abstract: Objective To evaluate the availability of miniscrew implants used as orthodontic anchorages. Methods Six completed skeletal Class Ⅱ patients were selected to study from thirty patients used miniscrew implants as the anchorages. Six skeletal Class Ⅱ maxillary protrusion patients were treated by extracting two upper first premolars and strong maxillary anchorages. Miniscrew implants were inserted into the buccal interalveolar septum between the maxillary second premolar and the maxillary first molar as a direct anchorage for anterior teeth retraction using 1.47-1.96 N force. Cephalometric radiographs were taken before and after closing the space. The cephalometric tracings were superimposed to determine any movement of the upper first molar and the retraction of anterior teeth. Results For the six patients, 12 miniscrew implants were used. After the treatment, the symptoms of the maxillary prognathism of the six patients were improved greatly. The edge of upper incisors was retracted by 6.06 mm on average, and the first molar was moved mesially by 0.44 mm. The miniscrew implants kept stable during treatment, and the surrounding soft tissue of the implants was healthy. Conclusion Miniscrew implants provide a good and convenient anchorage control in the orthodontic treatment.

Key words: orthodontic anchorage, miniscrew implant, clinical application