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Effects of Different Angulation Placement of Mini-Implant in Orthodontic

机译：微型种植体不同角度放置对正畸的影响

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Orthodontic is one of the treatments in dentistry field which concerned on malocclusion treatments such as improper bites,tooth irregularity and disproportionate jaw relationships.The mini-implant (OMI) is one of the components used in the orthodontic treatment,besides braces and spring.The application of OMI has been well accepted in orthodontic treatment.However,one of the main factors of OMI failures is the implant insertion procedure in which the clinician find it difficult to obtain the best angle to insert the OMI.Therefore,this study aims to evaluate stress in an OMI and bones using the finite element analysis (FEA) with variations of insertion angles and to identify their optimal angle for the implant placement.The three dimensional (3D) model of a left maxillary posterior bone section was constructed based on CT image dataset.That 3D model consists of cortical bone,cancellous bone,second premolar,first molar and second molar teeth.The 3D model of OMI was placed between root of second premolar and first molar teeth.The OMI was simulated with seven different angles of insertions:30°,40°,50°,60°,70°,80° and 90°.Within the seven different insertion angles,the results showed that the increase of insertion angle reduced the maximum equivalent von Mises stress in cortical bone,cancellous bone and OMI.Based on this FEA study,the optimal angle placement of OMI is when the implant positioned at vertical angle (90°) to the bone surface.
机译：正畸是牙科领域的一种治疗方法，涉及咬合不当，牙齿不规则，颌骨比例失调等咬合不正的治疗。微型植入物（OMI）是用于正畸治疗的组件之一，除牙套和弹簧外。 OMI在正畸治疗中的应用已广为接受。但是，OMI失败的主要因素之一是植入物插入过程，临床医生发现很难获得最佳角度来插入OMI。因此，本研究旨在评估使用有限元分析（FEA）对OMI和骨骼中的应力进行改变，确定插入角度的最佳角度，并确定植入物放置的最佳角度。基于CT图像构建左上颌后骨段的三维（3D）模型该3D模型由皮质骨，松质骨，第二前磨牙，第一磨牙和第二磨牙组成.OMI的3D模型放置在牙根之间分别在30°，40°，50°，60°，70°，80°和90°七个不同的插入角下模拟OMI。结果表明，在七个不同的插入角内插入角的增加减少了皮质骨，松质骨和OMI中的最大当量von Mises应力。基于此FEA研究，OMI的最佳角度放置是当植入物与骨表面成垂直角（90°）时。

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