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首页> 外文期刊>Journal of Clinical and Diagnostic Research >Torque Loss in En-Masse Retraction of Maxillary Anterior Teeth Using Miniimplants with Force Vectors at Different Levels: 3D FEM Study
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Torque Loss in En-Masse Retraction of Maxillary Anterior Teeth Using Miniimplants with Force Vectors at Different Levels: 3D FEM Study

机译：使用微型植入物在不同水平上使用力向量对上颌前牙进行大面积前牙整体牵引时的扭矩损失：3D FEM研究

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Objective: This FEM study was conducted to quantify the amount of torque loss in maxillary anterior teeth by applying force vectors from different levels to the anterior retraction hook at various heights and comparing with that of molar anchorage system.Materials and Methods: Five 3D FEM models were constructed with force vectors at different levels: HOT-High Orthodontic Traction (13.5mm from archwire) to ARH1? Anterior Retraction Hook (5mm), HOT to ARH2 (8mm), LOT- Low Orthodontic Traction (8 mm) to ARH1, LOT to ARH2 and from conventional molar hook to ARH1. Mini-implants were placed buccally between the roots of second premolar and first molar. Torque loss was calculated by measuring the displacement of the teeth at crown tip and root apex in two planes i.e. sagittal and vertical using Y and Z axis respectively in all the five models. The results were statistically analyzed by using Kruskal Wallis ANOVA and Mann-Whitney U-test.Results: HOT to ARH1 showed that the anterior teeth moved bodily (p =0.5127), followed by molar hook - ARH1(p=0.0495*) which showed mild uncontrolled tipping. Whereas the HOT- ARH2, LOT - ARH1,and LOT - ARH2 models exhibited uncontrolled tipping with maximum torque loss in LOT - ARH1 (p=0.0001*).Conclusion: It can be concluded that bodily movement with very minimal torque loss was observed in HOT-ARH1 model whereas the maximum torque loss was recorded in LOT-ARH2 model. Conventional molar anchorage group showed uncontrolled tipping with some amount of extrusion and anchor loss of posteriors.
机译：目的：通过对不同高度的前向牵引钩施加不同水平的力矢量，并与臼齿锚固系统进行比较，进行该FEM研究以量化上颌前牙的扭矩损失量。材料与方法：五个3D FEM模型用不同水平的力向量构造：HOT-高正畸牵引力（距弓丝13.5mm）至ARH1？前牵开钩（5mm），HOT至ARH2（8mm），LOT-低正畸牵引力（8 mm）至ARH1，LOT至ARH2，从常规磨牙钩至ARH1。将微型植入物颊侧放置在第二磨牙和第一磨牙的根之间。通过在所有五个模型中分别使用Y和Z轴测量矢状尖和根尖在两个平面（即矢状和垂直）中的齿位移来计算扭矩损失。结果使用Kruskal Wallis方差分析和Mann-Whitney U检验进行统计学分析。结果：HOT到ARH1表明前牙身体移动（p = 0.5127），然后是磨牙钩-ARH1（p = 0.0495 *），表明轻度不加控制的小费。而HOT-A​​RH2，LOT-ARH1和LOT-ARH2模型在LOT-ARH1中表现出不受控制的倾翻和最大扭矩损失（p = 0.0001 *）。结论：可以得出结论，观察到人体运动时扭矩损失非常小。 HOT-A​​RH1模型，而最大扭矩损失记录在LOT-ARH2模型中。常规磨牙锚固组表现出不受控的倾翻，并具有一定程度的挤压和后牙锚固丢失。

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