Relationship between tooth rotation direction and orthodontic moment

- Is there any difference of treatment results based on the direction to install the wire? -

Abstract

The purpose of this study is to verify the difference of moment when rotating teeth around two different axes as one of quantitative evaluation of orthodontic treatment. Although the alignment of the dentition is dependent on mechanical factors, quantitative measurements of the forces and moments applied to the teeth during treatment were not performed sufficiently. In this paper, the moment was measured using simulated orthodontic force measurement device. The device can measure 3-axis forces and moments applied to teeth. The moment applied to the tooth when the bracket attached to the tooth was rotated -20 to 20 degrees around two different axes was measured. The two moments should theoretically be the same value for each angle. However, as a result of measurement, it turned out that moment is different for each axis. This experiment result suggest that the dentist needs to consider details such as the skill of wire attachment.