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The effect of Alexander, Gianelly, Roth, and MBT bracket systems on anterior retraction: a 3-dimensional finite element study.
Clinical Oral Investigations ( IF 3.4 ) Pub Date : 2019-07-28 , DOI: 10.1007/s00784-019-03016-6
Mauro Cozzani 1 , Donia Sadri 2 , Ludovica Nucci 3 , Parsa Jamilian 4 , Amir Parham Pirhadirad 5 , Abdolreza Jamilian 6
Affiliation  

OBJECTIVES The aims of this study were to compare the effect of 4 bracket systems including Alexander, Roth, MBT, and Gianelly on upper anterior retraction and to quantify the amount of torque loss ratio in sliding mechanics by help of a 3-dimensional (3D) finite element method. METHOD AND MATERIALS 3D FEM models were constructed in order to simulate anterior incisor retraction in first premolar extraction case. Displacement, stress, and strain on the incisal edge and apex of maxillary central incisor were calculated when 1-, 2-, and 3-N retraction forces were applied. Torque loss ratio was calculated by measuring the displacement of the teeth at crown tip and root apex in all 4 bracket systems on upper central incisor. RESULTS Uncontrolled lingual crown tipping of the incisor was observed in all bracket systems. The crown moved lingually by 9.5 μm and the root labially by 4.5 μm in MBT system with 3-N retraction force. The amount of crown movement was 8 μm and the root displacement was 4 μm in Gianelly system with the same retraction force. Torque loss ratio was 1.46 in Alexander and Gianelly with 3-N retraction force. However, the amount of torque loss ratio was 1.47 in MBT and Roth with the same retraction force. CONCLUSIONS AND CLINICAL RELEVANCE Uncontrolled tipping was the least in Gianelly and was the highest in MBT. The amount of torque loss ratio was the lowest in Gianelly and Alexander systems and the amount of torque loss ratio was the highest in MBT system.

中文翻译:

Alexander,Gianelly,Roth和MBT托槽系统对前移的影响:3维有限元研究。

目的本研究的目的是比较3种支架系统(包括Alexander,Roth,MBT和Gianelly)对上前部牵开的作用,并借助3维(3D)量化滑动力学中的扭矩损失率。有限元法。方法和材料构建3D FEM模型以模拟第一例前磨牙拔除病例中的前门牙回缩。当施加1-N,2-N和3-N牵拉力时,计算上颌中切牙的切缘和顶点的位移,应力和应变。通过测量上中门牙上所有4个托槽系统中冠尖和根尖处牙齿的位移来计算扭矩损失比。结果在所有托槽系统中均观察到切牙的舌尖未受控。冠舌移动了9。在具有3-N收缩力的MBT系统中,根部5微米,根部唇部宽4.5微米。在相同的回缩力下,Gianelly系统的冠冠运动量为8μm,根部位移为4μm。亚历山大和吉安利(Gianelly)在3-N收缩力的情况下扭矩损失率为1.46。然而,MBT和Roth在相同的回缩力下的扭矩损失比为1.47。结论和临床意义吉尼尔利的失控小费最少,而MBT最多。在Gianelly和Alexander系统中,扭矩损失比的数量最低,而在MBT系统中扭矩损失比的数量最高。亚历山大和吉安利(Gianelly)的扭矩损失比为1.46,具有3-N收缩力。然而,MBT和Roth在相同的回缩力下的扭矩损失比为1.47。结论和临床意义吉尼尔利的失控小费最少,而MBT最多。在Gianelly和Alexander系统中,扭矩损失比的数量最低,而在MBT系统中扭矩损失比的数量最高。亚历山大和吉安利(Gianelly)在3-N收缩力的情况下扭矩损失率为1.46。然而,MBT和Roth在相同的回缩力下的扭矩损失比为1.47。结论和临床意义吉尼尔利的失控小费最少,而MBT最多。在Gianelly和Alexander系统中,扭矩损失比的数量最低,而在MBT系统中扭矩损失比的数量最高。
更新日期:2020-02-20
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