Abstract:

Objective To investigate the effect of root resorption of maxillary anterior teeth from adult patients with skeletal Class Ⅱ malocclusion before and after orthodontic treatment. Methods A total of 20 adult patients with bone protrusion who had undergone treatment in the orthodontic department were selected and all had CBCT taken before and after orthodontic treatment. The changes in the root surface of the anterior teeth of orthodontic patients were assessed by colour-coded maps using 3D reconstruction techniques. The root length and root volume of the upper incisors were measured and the amount of root resorption was calculated. Results Adult patients with bone protrusion had a significant reduction in root length and volume of each maxillary incisor after extraction (P<0.05), with women having significantly greater root length and volume resorption than men (P<0.05). The mesial incisors had greater root volume resorption than the lateral incisors (P<0.05), but there was no significant difference in length and volume between the maxillary incisors after treatment (P>0.05). Conclusion The length and volume of the roots of adult bone protrusions are reduced after fixed orthodontic treatment. Root resorption in the upper incisors is influenced by the degree of bone malformation and gender, with women experiencing a greater reduction in roots compared to men.

Key words: skeletal ClassⅡ malocclusion, root resorption, root volume