Comparison of Torsional Control of Anterior Molars by Bracket Type in Extraction of Premolars

Gui -feng LI; Jing ZHOU; Guang -lei WANG; Li-qiong CHEN; Lang LEI

doi:10.12259/j.issn.2095-610X.S20211223

Volume 42 Issue 12

Dec. 2021

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Gui -feng LI, Jing ZHOU, Guang -lei WANG, Li-qiong CHEN, Lang LEI. Comparison of Torsional Control of Anterior Molars by Bracket Type in Extraction of Premolars[J]. Journal of Kunming Medical University, 2021, 42(12): 74-82. doi: 10.12259/j.issn.2095-610X.S20211223

Citation:

Gui -feng LI, Jing ZHOU, Guang -lei WANG, Li-qiong CHEN, Lang LEI. Comparison of Torsional Control of Anterior Molars by Bracket Type in Extraction of Premolars[J]. Journal of Kunming Medical University, 2021, 42(12): 74-82. doi: 10.12259/j.issn.2095-610X.S20211223

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Comparison of Torsional Control of Anterior Molars by Bracket Type in Extraction of Premolars

doi: 10.12259/j.issn.2095-610X.S20211223

1.
Dept. of Orthodontics,The Nanjing Stomatological Hospital, Medical School of Nanjing University，Nanjing Jiangsu 210008
2.
Dept. of Stomatology，Yan’an Hospital
3.
Dept. of Stomatology，Central Hospital of Jiading District，Shanghai 201800
4.
Stomatological Hospital Affiliated to Kunming Medical University，Kunming Yunnan 650106，China

Received Date: 2021-10-16
Available Online: 2021-11-17
Publish Date: 2021-12-15

Abstract

Abstract

Objective To compare the torque control of upper teeth with 3 appliances （Damon double wings bracket, Tip-Edge Plus bracket and Damon self-ligating bracket） in the extraction cases, and to provide the reference basis for the comprehensive consideration of the patient’s condition and the selection of the best appliance and correction technique. Methods A total of 40 patients were selected from the Orthodontics Department of Stomatology Hospital affiliated to Nanjing University School of Medicine and The Stomatology Department of Kunming Yan’an Hospital from January 2016 to December 2019. The patients were moderate dentition congestion with Angle type I malocclusion requiring extraction of the first maxillary premolars. Among them, 10 patients were treated with Ormaco traditional double-wing straight wire arch bracket orthodontic device, 10 patients with TIP-EDGE Plus differential dynamic straight wire arch bracket orthodontic device and 20 patients with Damon passive self-locking orthodontic device with standard torque. Twenty measurement items reflecting cranio-maxillofacial relationship and soft tissue morphology were compared before and after treatment. Results In the three groups, the anterior protrusion of the anterior teeth was presented before the treatment, and the side appearance was in the protrusive state. After treatment of three kinds of orthodontic techniques, the anterior teeth protrusion improved, ∠U1-L1 increased than before treatment, while ∠U1-NA decreased.In the soft tissue, the three groups of UL-EP and LL-EP reduced, and the Z angle increased, which was close to the normal value, suggesting that the side front process was also improved. There was no significant difference among the three groups in the 4 aspects of sagittal, vertical, anterior dental protrusion and soft tissue before and after correction （P > 0.05）. Conclusion The results of this study showed that Damon double wings bracket, Tip-Edge Plus bracket and Damon self-ligating bracket have a certain effect on improving anterior teeth protrusion. After treatment, the measured values were closed to normal numerical value. The standard torque Damon self-ligating bracket and Tip-Edg plus bracket as well as Damon double wings bracket can effectively control the anterior teeth torque in the extraction cases. Three kinds of brackets have no obvious difference in the control torque.
- Extraction treatment,
- Damon double wings bracket,
- Tip-Edg plus bracket,
- Damon self-ligating bracket,

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References(32)

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