Soft and Hard Tissue Changes in Adults with Skeletal Class Ⅲ Malocclusion Before and After Camouflage Therapy

doi:10.13701/j.cnki.kqyxyj.2020.11.020

Abstract

Abstract: Objective: To explore the changes and the correlation between soft and hard tissue in adults with skeletal class Ⅲ malocclusion before and after non-extraction camouflage treatment. Methods: Lateral cephalometric radiographs of 20 adult's subjects with skeletal Class III malocclusions were selected. 18 items of hard tissue and 15 items of soft tissue were measured before and after treatment to compare the changes and the correlation between soft and hard tissue. Results: After treatment, the index of hard tissue: SNA, U1- SN, U1-VRL, and U1-HRL increased, while L1-VRL decreased. The difference was statistically significant (P<0.05). The index of soft tissues: Sn-VRL, A'-VRL, UL-VRL increased, while facial convexity angle and LL-VRL decreased (P<0.05). The distance measuring index of soft and hard tissue had different degree correlation in sagittal direction (P<0.05) . Conclusion: In Class Ⅲ malocclusions, the mandibular incisors were relatively retroclined, and the maxillary incisors were relatively proclined to compensate for skeletal dysplasia after non-extraction camouflage treatment. The soft tissue profile was improved, the upper lip moved forward, and the lower lip was retracted. There was a correlation between the changes of soft and hard tissue.

Key words: Skeletal Class Ⅲ malocclusion, orthodontic camouflage therapy, soft and hard tissue changes

LIU Lingxia, GUAN Yuxin, WU Xiuping. Soft and Hard Tissue Changes in Adults with Skeletal Class Ⅲ Malocclusion Before and After Camouflage Therapy[J]. Journal of Oral Science Research, 2020, 36(11): 1074-1078.

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