[Stability of upper molars with the application of implant anchorage]

Sheng-ji Zhu, Yan-heng Zhou, Min-kui Fu
Zhonghua Kou Qiang Yi Xue za Zhi, Zhonghua Kouqiang Yixue Zazhi, Chinese Journal of Stomatology 2006, 41 (1): 4-7

OBJECTIVE: To investigate the stability of upper molars with the application of micro-screw implant anchorage during orthodontic treatment.

METHODS: Fifteen 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. The average treatment period to close the extraction space was 10.5 months. Cephalometric and cast analysis were carried out.

RESULTS: During the treatment, the micro-screw implants kept stable in sagittal plane; neither the mesial-distal movement nor the rotation or tipping of the upper molars during the treatment was of statistic significance (P > 0.05); the edge of upper incisors was retracted by 6.99 mm on average, and no significant vertical change was observed (P > 0.05).

CONCLUSIONS: Micro-screw implant could provide good anchorage control in the orthodontic treatment.

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