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首页> 外文期刊>American Journal of Orthodontics and Dentofacial Orthopedics >Displacement and stress distribution by different bone-borne palatal expanders with facemask: A 3-dimensional finite element analysis
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Displacement and stress distribution by different bone-borne palatal expanders with facemask: A 3-dimensional finite element analysis

机译：具有面罩的不同骨骼腭扩展器的位移和应力分布：三维有限元分析

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Introduction: The purpose of this study was to analyze displacement and stress distribution in the maxilla during maxillary expansion followed by protraction using bone-borne and conventional tooth-borne palatal expanders and a facemask via 3-dimensional finite element analysis. Methods: A finite element model of an adolescent skull was created, and 4 different types of appliances were integrated into it: facemask (type A); facemask with paramedian bone-borne expander (type B), facemask with palatal-slope bone-borne expander (type C), and facemask with conventional expander (type D). Expansion of 0.25 mm followed by 500 g of force per side was applied. Results: Type A showed anterior displacement of the dentition combined with downward displacement of posterior teeth and upward displacement of anterior teeth. The combination of protraction and expansion in type D showed the greatest anterior displacement. In types B and C, the expansion forces resulted in posterior displacement decreasing the net displacement of the combination. Stresses concentrated around the miniscrews in types B and C. In types A and D, stresses concentrated at the first premolar and first molar. Type B had the highest stresses followed by type C and then D. Conclusions: The conventional tooth-borne expander (type D) enhanced the effect of maxillary protraction. Facemask alone (type A) resulted in more anterior displacement of the maxilla than the combination of facemask and bone-borne expanders (types B and C). The clinician should be aware of the initial stresses and movements from different expanders with facemask found in this study and confirm the movements in future clinical Class III studies.
机译：介绍：本研究的目的是在上颌扩张期间分析上颌中颌骨的位移和应力分布，然后使用骨头传统的齿轮腭扩展器和通过三维有限元分析进行突出。方法：创建了一个青少年头骨的有限元模型，并将4种不同类型的设备集成在其中：Facemask（类型A）;面向护理女性骨骼扩展器（B型），带有腭坡骨骼扩展器（C型）的面罩，以及带有常规扩展器（D型）的面罩。施加0.25毫米，然后施加每侧500克力。结果：A型显示牙列的前置位移与前齿下方的向下位移和前齿的向上移动。 D型突起和膨胀的组合显示了最大的前置位移。在B型和C类型中，膨胀力导致后位移降低组合的净移位。在B和C型型迷你螺钉上浓缩的应力。在A和D类型中，浓缩在第一磨牙和第一摩尔时浓缩。 B型具有最高的应力，然后是C型，然后D.结论：传统的齿轮膨胀机（D）增强了上颌突起的效果。单独的Facemask（A型）导致颌面中的前位位移而不是面罩和骨骼扩展器（B和C类型）的组合。临床医生应了解在本研究中发现的不同扩展人员的初始压力和运动，并在本研究中发现，并确认了未来临床三级研究中的运动。

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