Intrusion of Six Maxillary Anterior Teeth Using Mini-screw Anchorage: A Finite Element Study
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Abstract
Objectives: To evaluate the von Mises stress distribution and displacement of the six maxillary anterior teeth intruded with two patterns of mini-screw anchorage, analyzed by the finite element method.
Methods: A finite element model of six maxillary anterior teeth with periodontal ligament and alveolar bone was constructed. In anchorage pattern 1, one mini-screw was placed between the central incisors with a net force of 60 g applied to the arch wire between the central incisors towards the mini-screw. In anchorage pattern 2, two mini-screws were placed between the lateral incisors and canines, left and right, with force applied to the arch wire between the central and lateral incisors in an oblique direction towards the mini-screws. The stress distribution and the displacement of the teeth were analyzed.
Results: In anchorage pattern 1, the von Mises stress on the central incisors was greater than that on the lateral incisors or canines. In anchorage pattern 2, the von Mises stress distribution was greater on the central and lateral incisors than on the canines. In anchorage pattern 1, all teeth were intruded with proclination. In anchorage pattern 2, the central incisors were intruded along their long axes, whereas the lateral incisors and canines were slightly proclined.
Conclusions: The two-mini-screw pattern distributes stress in four incisors and displaces teeth closer to pure intrusion than the one-mini-screw pattern.
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References
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