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Published on: October 18, 2021
[Treatment of maxillary protrusion in adult with self-tapping micro-screw implants]
Da-wei Wang1, Zhi-cai Feng, Shuang-lin Zhu
1Department of Orthodontic, Guanghua School of Stomatology, Sun Yat-sen University, Guangzhou 510055, China. fzcu2@tom.com
Objective:
To investigate the position change of upper molars and incisors in order to evaluate the stability of posterior anchorage with the application of micro-screw implant.
Methods:
Eight adult patients with severe maxillary protrusion were included. Upper first premolars were extracted and upper posterior anchorage was reinforced with micro-screw implant in all patients. Cephalometric and cast analyses were carried out to record the position change of molar and micro-screw.
Results:
During treatment the micro-screw implants kept stable in sagittal and vertical plane. Neither the mesial-distal movement nor the tipping of the upper molars during the treatment was statistically significant (P > 0.05). The edge of upper incisors was retracted by 6.86 mm and the tipping was reduced by 18.03 degrees . The center of resistance was intruded by 3.28 mm on average. Significant change was observed (P < 0.01).
Conclusions:
Micro-screw implant could provide good anchorage control in the orthodontic treatment.
