Crown-root morphology of lower incisors in patients with class III malocclusion.
The purpose of this study was to investigate the crown-root morphology of lower incisors in patients with class III malocclusion using cone-beam computed tomography.
Cone-beam computed tomography images were analyzed from 53 adult class I patients (group 1), 37 preadolescent class III patients (group 2), and 66 adult class III patients (group 3) comprising 3 divisions (divisions 1, 2, and 3 corresponded to mild, moderate, and severe class III malocclusions). The size and crown-root angulations of lower incisors in different groups and divisions were statistically appraised with group 1 used as the control group.
No significant differences were found for the size of lower incisors among different groups and divisions (P > 0.05). Compared with group 1, the crown-root angulations of lower incisors in groups 2 and 3 were significantly larger (P < 0.01), and among 3 divisions, the lower incisors of division 3 rather than divisions 2 and 3 exhibited larger crown-root angulations (P < 0.01).
Attention should be paid to the enlarged crown-root angulations of lower incisors in class III patients during orthodontic and orthognathic treatment, especially in severe ones.
Center of Cranio-facial Orthodontics, College of Stomatology, Affiliated 9th People's Hospital, Shanghai Key Laboratory of Stomatology, Shanghai Jiao Tong University, Shanghai, People's Republic of China.
SourceThe Journal of craniofacial surgery 23:4 2012 Jul pg e349-54
Cone-Beam Computed Tomography
Malocclusion, Angle Class III
Radiographic Image Interpretation, Computer-Assisted
Pub Type(s)Journal Article
Research Support, Non-U.S. Gov't