Clinical effect of Invisible MA Appliance and Twin-block Appliance in Treatment of Early Skeletal Class II Mandibular Retrusion Malocclusion

Qi-qi YANG; Ya-li CHEN; Yuan ZHOU; Jiang-tian HU

doi:10.12259/j.issn.2095-610X.S20210308

Volume 42 Issue 3

Apr. 2021

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Article Navigation > Journal of Kunming Medical University > 2021 > 42(3): 29-34

Qi-qi YANG, Ya-li CHEN, Yuan ZHOU, Jiang-tian HU. Clinical effect of Invisible MA Appliance and Twin-block Appliance in Treatment of Early Skeletal Class II Mandibular Retrusion Malocclusion[J]. Journal of Kunming Medical University, 2021, 42(3): 29-34. doi: 10.12259/j.issn.2095-610X.S20210308

Citation:

Qi-qi YANG, Ya-li CHEN, Yuan ZHOU, Jiang-tian HU. Clinical effect of Invisible MA Appliance and Twin-block Appliance in Treatment of Early Skeletal Class II Mandibular Retrusion Malocclusion[J]. Journal of Kunming Medical University, 2021, 42(3): 29-34. doi: 10.12259/j.issn.2095-610X.S20210308

Citation:

Qi-qi YANG, Ya-li CHEN, Yuan ZHOU, Jiang-tian HU. Clinical effect of Invisible MA Appliance and Twin-block Appliance in Treatment of Early Skeletal Class II Mandibular Retrusion Malocclusion[J]. Journal of Kunming Medical University, 2021, 42(3): 29-34. doi: 10.12259/j.issn.2095-610X.S20210308

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Clinical effect of Invisible MA Appliance and Twin-block Appliance in Treatment of Early Skeletal Class II Mandibular Retrusion Malocclusion

doi: 10.12259/j.issn.2095-610X.S20210308

Dept. of Orthodontics，Affiliated Stomatological Hospital of Kunming Medical University，Kunming Yunnan 650031，China

Received Date: 2021-01-07
Publish Date: 2021-04-09

Abstract

Abstract

Objective To comapre the clinical effect of invisible MA and double plate appliance in the treatment of children with early skeletal Class II mandibular retrusion malocclusion. Methods We selected 30 children with skeletal Class II mandibular retrusion malocclusion, with an average age of 10.5 years, divided them into invisible MA appliance correction group （group A） and twin-block correction group （group B）, 15 cases in each group. The changes of jaw and teeth before （T0） and after （T1） treatment were measured and analyzed. Results Bone indexes: after treatment, there were statistically significant increases in SNB Angle, decrease in ANB Angle, decrease in Wits value, and increase in Pg/OLP of mandibular position in both groups （P < 0.05）, while there was no statistically significant difference between the two groups （P > 0.05）. After correction, the anterior height ratio of s-Go/N-ME in both groups decreased, while the mandibular plane Angle SN/MP, the anterior lower height ratio and the anterior lower height ratio of ANS/N-ME in both groups increased （P < 0.05）, and the differences between the two groups were statistically significant （P < 0.05）. Dental properties: U1-SN of the upper incisor decreased, l1-MP of the lower incisor increased, coverage improved, and molar relationship improved after treatment in both groups, all of which were statistically significant （P < 0.05）. Only l1-MP Angle was significantly different between the two groups （P < 0.05）. Pancherz analysis was used to conclude that the bone effect of group A was greater than that of group B. Conclusions The two kinds of orthodontics can effectively promote the development of mandible and improve the intersagittal deformity of mandible. After the orthodontics, the mandible will rotate clockwise, but the invisible orthodontics rotate less than the double plate orthodontics. The invisible orthodontic device MA can control the axial inclination of the anterior teeth better, and the loss of the anterior anchorage is less, so the orthodontic treatment can obtain better bone effect.
- Skeletal Class II malocclusion,
- Mandibular retrusion,
- Invisible MA appliance,
- Twin-block appliance

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References(27)

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