Study on soft tissue changes of angle class Ⅱ division Ⅰ mandibular retraction patients during mixed dental period with MRC functional correction
Journal Title: 口腔疾病防治 - Year 2019, Vol 27, Issue 6
Abstract
Objective To observe the changes of soft tissue in patients with Angle class Ⅱ division Ⅰ malocclusion during mixed dentition treated with MRC functional appliance. Methods Twenty patients with Class Ⅱ division Ⅰ malocclusion of Angle were treated with functional MRC. The facial features before and after treatment were measured by software and the results were analyzed statistically. Results The patients′soft tissue profiles were improved significantly before and after treatment, The OE-Prn-Pos angle, OE-N′-B′ angle, OE-N′-Pos angle, OE-Prn-N′angle, Cm-Sn-UL angle, and N′-Sn-Pos angle increased significantly (P < 0.05). The OE-Sn-UL angle, and Sn-N′-B′ angle decreased significantly (P < 0.05); the distance between the lateral soft tissue line and the middle Sn-H line, UL-E line and LL-E line were significantly different (P < 0.05). The distances were all reduced, and the difference was statistically significant (P < 0.05). Conclusion The application of an MRC functional appliance can improve the relationship among nasolabial soft tissue, upper and lower lip soft tissue, and chin-lip soft tissue, thus improving the protrusion profile of patients.
Authors and Affiliations
HUANG You, YAO Dongping, LU Shijun, PAN Yongchu, WANG Lin
Keywords
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- EP ID EP623739
- DOI 10.12016/j.issn.2096-1456.2019.06.007
- Views 193
- Downloads 0
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