BACKGROUND Maxillary skeletal expander (MSE) in combination with miniscrews was developed to overcome the drawbacks that may have resulted from the application of conventional rapid maxillary expander (RME). This research was conducted to analyze the difference of stress distribution of maxillary expansion using RME and MSE in the region of interests (ROIs): first molars (M1), palatal alveolar bones of M1, palatine sutures, zygomatic sutures, miniscrews, and their surrounding bones. METHODS A dry skull was scanned using CBCT and rendered into a three-dimensional (3D) model of craniomaxillary structures. The data analysis was done both visually and numerically. RESULT The stress distributions in RME group were located at the palatal side of M1, mesial side of palatal alveolar of M1, pulp chamber of M1, and inferior cortex of palatine sutures. The stress distributions in the MSE group were located at the distopalatal cusp of M1, palatal side of palatal alveolar of M1, and inferior and superior cortex of palatine sutures. The stress distributions in zygomatic sutures on both groups were located at the zygomaticotemporal sutures, whereas in the miniscrews, the stress were located at the anterior miniscrews and palatal side of surrounding bones. CONCLUSIONS There were significant differences of stress distribution of maxillary expansion measured in the ROIs in the craniomaxillary 3D model using RME and MSE.

中文翻译：

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快速上颌骨扩张器（RME）和上颌骨骨骼扩张器（MSE）的上颌骨扩张应力分布的差异-有限元分析。

背景技术开发了与微型螺钉结合的上颌骨扩张器（MSE）以克服可能由于传统的快速上颌骨扩张器（RME）的应用而导致的缺点。进行这项研究以分析使用RME和MSE在感兴趣区域（ROIs）上颌骨扩张的应力分布的差异：第一磨牙（M1），M1的pa牙槽骨，p缝、,骨缝合，小螺钉及其周围骨头。方法使用CBCT对干燥的颅骨进行扫描，并将其渲染到颅颌骨结构的三维（3D）模型中。数据分析是在视觉和数字上进行的。结果RME组的应力分布位于M1的lat侧，M1的al齿槽中侧，M1的髓腔和ala缝的下皮质。MSE组的应力分布位于M1的足底尖，M1的pa骨al侧，side缝的上下皮质。两组骨缝合线的应力分布位于the颞颞缝合线，而在微螺钉中，应力位于周围骨骼的前微螺钉和pa侧。结论在使用RME和MSE的颅颌3D模型中，在ROI中测量的上颌骨扩张应力分布存在显着差异。而在微螺钉中，应力位于周围骨骼的前微螺钉和pa侧。结论在使用RME和MSE的颅颌3D模型中，在ROI中测量的上颌骨扩张应力分布存在显着差异。而在微螺钉中，应力位于周围骨骼的前微螺钉和pa侧。结论在使用RME和MSE的颅颌3D模型中，在ROI中测量的上颌骨扩张应力分布存在显着差异。