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Comparative analysis of chin soft tissue angle before and after orthodontic treatment with extraction
in skeletal class Ⅱ and class Ⅲ Malocclusion adults with different skeletal vertical patterns |
| GUO Yujing, ZHANG Xiaoya, CHENG Yi, ZHANG Ronghe* |
| Orthodontics, Binzhou Medical University Hospital, Binzhou 256603, Shandong, P.R.China |
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Abstract Objective To evaluate and compare the change of chin soft tissue in skeletal class Ⅱ, Ⅲ malocclusion adults with different skeletal vertical patterns before and after orthodontic treatment, and to evaluate the sensitivity of improvement of soft tissue profile after orthodontic treatment between the different skeletal malocclusion and vertical patterns.Methods Skeletal class Ⅱ and class Ⅲ malocclusion adult patients were randomly selected, and divided according to the vertical growth pattern, with 10 cases in each group. X-ray lateral cephalograms were taken at pre-and post-orthodontic treatment, and the related variables of chin soft tissues were measured and statistically analyzed.Results After treatment, the LL-B′-Pog′ was significantly reduced in the groups of high-angle and normal-angle in skeletal class Ⅱ and class Ⅲ malocclusion, P＜0.01, but the high-angle group showed a more significant reduction than the normal-angle group, P＜0.05. There were increases in Pog-Pog′, Pog′B′-FH, and B′LL-FH in the group of high-angle after treatment, P＜0.05, whereas the LL-Pog′ showed a reduction, P＜0.01. In the group of low-angle, the LL-E was markedly reduced, P＜0.01. Obvious reductions showed in LL-E, B′LL-FH, and Pog-Pog′ in the group of high-angle in skeletal class Ⅲ malocclusion after treatment, P＜0.05, meanwhile, distinct increases showed in B′-LLPog′ and Pog′B′-FH, P＜0.01. There were no statistical differences in the normal-angle group except the reduction of B′LL-FH, P＜0.01. In the group of high-angle, the skeletal class Ⅲ malocclusion showed a more significant variation than the class Ⅱ malocclusion in the LL-B′-Pog′, Pog-Pog′, and B′LL-FH, P＜0.01, the change of mentolabial angle was more distinct in the skeletal class Ⅲ malocclusion than the skeletal class Ⅱ malocclusion in normal-angle group, P＜0.05.Conclusion The chin soft tissue and lateral appearance tend to be in harmony after orthodontic treatment with extraction in adults. There was a more significant change of the chin soft tissue in the high-angle group on account of orthodontic treatment with extraction, especially in the skeletal class Ⅲ malocclusion.
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Received: 22 December 2019
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