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Drift characteristics of miniscrews and molars for anchorage under orthodontic force: 3-dimensional computed
1Department of Orthodontics, School of Dentistry, Shandong University, Jinan, China.
Introduction:
Although miniscrews have been used as absolute anchorage for a long time, their behavior under orthodontic loading is still unclear clinically. Therefore, this study was designed to evaluate the behavior of miniscrews under loading by retrospective 3-dimensional registration.
Methods:
Sixty adult patients who had miniscrews as anchorage for en-masse retraction of anterior teeth were studied. Computerized tomography scans were made before force application and after closure of the extraction spaces, respectively. The 3-dimensional reconstruction and registration of before and after computerized tomography data were performed to assess the displacement of the miniscrews, first molars, and maxillary central incisors.
Results:
The miniscrews and the maxillary first molars drifted mesially 0.23 and 0.91 mm apically, and 0.23 and 0.92 mm coronally; the amounts of maxillary incisor retraction at the edge and the apex were 5.94 and 1.40 mm, respectively, with 1.84 mm of maxillary central incisor intrusion.
Conclusions:
Our results indicated that the miniscrews and the maxillary first molars were mesially displaced under orthodontic loading. A mesial site for miniscrews might be a better choice for long-term stability.
