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- Title
Examining incisor root resorption using CBCT after orthodontic treatment for adults with skeletal class III malocclusion.
- Authors
WANG Fang; WANG Jianguo; ZHANG Xizhong
- Abstract
Objective To evaluate incisor root resorption of adults with skeletal class III malocclusion through three-dimensional reconstruction of cone beam computed tomography (CBCT) image using interacting medical imaging control system (Mimics) and then offer guidance for labially tilted angle control in orthodontic treatment and distance of bone moving in surgery. Methods Adults of skeletal class III malocclusion (n=30) who underwent orthodontic-orthognathic combination treatment were included in this study. CBCT images were then reconstructed three-dimensionally using Mimics 10.01. Each incisor were separated at cementum-enamel junction as crown and root. Labially tilted angle and root volumes of each incisor were measured before and after operations. At last, the correlativity between root resorption and labially tilted angle was calculated through statistic analysis. Results The decrement of upper, lower and front incisors' root volumes upon treatment is statistically significant. However, there is no statistically significant difference of incisor's root volumes among eight incisors nor between different gender. There is linear correlation between root volumes and labially tilted angle when the latter changes 7° or more when they followed the fomular ...=-21.416+5.618X. Conclusion For adults with skeletal class III malocclusion, orthodontic treatment before orthognathic surgery decrease incisor root volumes when labially tilted angle changes 7° or more.
- Subjects
ROOT resorption (Teeth); MALOCCLUSION; CONE beam computed tomography; ORTHODONTICS; TEETH surgery
- Publication
Tianjin Medical Journal, 2015, Vol 43, Issue 4, p390
- ISSN
0253-9896
- Publication type
Article
- DOI
10.11958/j.issn.0253-9896.2015.04.015