Methods: The dry human skull was visualizated by CT and it was transfered to 3D finite element model. It was evaluated of a displacement pattern and stress distribution under each conditions. Results:
Conclusions: 1. In case that anterior teeth was posteiorly tracted by a conventional T-loop arch wire, anterior teeth moved more tipped postero-inferiorly and posterior teeth moved slightly to mesial direction. 2. In case with corticotomy, it was shown to be smaller degree of tipping movement of anterior teeth. But, they were more displaced. 3. In comparison of a difference of tooth movement according to anchorage position in buccal traction, the case that force was applied to microscrew between maxillary second premolar and first molar was shown to be a smaller degree of tipping movement than force to second premolar reinforced with a microscrew. 4. In comparison of a difference of tooth movement according to anchorage position in palatal traction, the case that force was applied to microscrew between maxillary first molar and second molar was shown to be a smaller degree of tipping movement than force to microscrew on the midpalatal suture. 5. In comparison of a difference of tooth movement according to force application point, the case that force was applied to microscrew from lever arm was shown to be a smaller degree of tipping movement than force to microscrew from canine.