隐形下颌前导矫治器治疗骨性Ⅱ类效果研究

doi:10.13591/j.cnki.kqyx.2022.09.009

Abstract

Abstract: Objective To assess the clinical efficacy of invisible mandibular-advancement appliances on skeletal Class Ⅱ teenagers with Twin-Block as the control. Methods Forty-nine patients were involved in the retrospective study (21 in invisible group and 28 in TB group), whose lateral cranial radiographs taken before and after treatment were traced and analyzed. Dental, skeletal indexes and Holdaway analysis results of two groups were statistically compared. Results After treatment, SNB increased significantly in both groups. Increase in invisible group (ΔT=3.18±1.67) was significantly larger than that in TB group (ΔT=1.73±1.53) (P=0.013). ANB and OJ, meanwhile, decreased with no statistical difference. But in ANB, invisible group (ΔT=-2.76±1.48) showed a more obvious trend of decreasing than TB group (ΔT=-2.40±1.33). The invisible group also revealed better control of incisors′ inclination as well as a trend of decreasing in mandibular plane angle. Both groups demonstrated major improvement of patients′ profiles according to Holdaway analysis. Conclusion Invisible mandibular-advancement appliances display a similar effect of mandibular advancement, which is confirmed in the treatment of skeletal Class Ⅱ patients with TB. In addition, the invisible group has an advantage when a control of frontal teeth and vertical growth pattern is needed, while TB is more efficient in inducing the mandibular ramus. Both appliances could significantly improve soft tissue protrusion.

Key words: retrognathia, functional orthodontic appliance, mandibular advancement, retrospective study

CLC Number:

R783.5

YU Xiaoyi, CHEN Siyu, LI Hui, YANG Wanqi, LI Xinyi, ZHU Xianchun. Study on the effect of invisible mandibular-advancement applianceon the treatment of skeletal Cass Ⅱ patients[J]. Stomatology, 2022, 42(9): 813-817.

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Study on the effect of invisible mandibular-advancement applianceon the treatment of skeletal Cass Ⅱ patients

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