Abstract
BackgroundSliding mechanics with miniscrews is recently used for extraction space closure. The purpose of this study was to elucidate how and why the archwire size affects long-term tooth movement in miniscrew sliding mechanics.MethodsLong-term orthodontic tooth movements were simulated based on a remodeling law of the alveolar bone by using a finite element method, in which the bracket rotated freely within a clearance gap (a play) of the archwire-bracket slot. The archwire size was changed to 0.021, 0.018, and 0.016 in. for the 0.022-in. bracket.ResultLingual crown tipping and extrusion of the incisors increased with decreasing the archwire size. Movements of the posterior teeth were approximately the same irrespective of archwire size.ConclusionsWhen decreasing the archwire size, a play of the archwire-bracket slot, as well as the elastic deformation of the archwire, resulted in lingual tipping of the incisors. This tipping led to extrusion of the incisors.
Highlights
Sliding mechanics is a standard method used for extraction space closure [1, 2]
Miniscrews placed into the maxillary or mandibular bone have recently been used for an orthodontic anchorage in the sliding mechanics [3,4,5]
The lingual tipping continued till the tipping angle reached the maximum rotation angle Δθ so that both diagonal corners of rectangular section of the archwire contacted to the bracket slot (Fig. 1)
Summary
The retraction force decays by friction between the archwire and the bracket slot, the bracket slides along the archwire so that bodily tooth movement can be achieved. Miniscrews placed into the maxillary or mandibular bone have recently been used for an orthodontic anchorage in the sliding mechanics [3,4,5] This method, miniscrew sliding mechanics, eliminates anchorage problems and achieves en masse retraction of the anterior teeth. Conclusions: When decreasing the archwire size, a play of the archwire-bracket slot, as well as the elastic deformation of the archwire, resulted in lingual tipping of the incisors. This tipping led to extrusion of the incisors
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