Abstract

Few studies have examined the biomechanical effects of dental implant placement in the implant-supported mandibular advancement device (MAD) for the treatment of obstructive sleep apnea in completely edentulous patients. This biomechanical study aimed to evaluate the stability of the implant-supported MAD for different numbers and positions of dental implants. A 3D edentulous maxillofacial model with the one-piece MAD was considered for various numbers and positions of implants. On each mandible and maxilla, one, two, four, or six implants were placed symmetrically in various positions. Total 42 implant placements were considered. A static finite element analysis was performed under the mandibular posterior restorative force for 40% protrusion. The maximum and minimum principal stresses on the cortical and cancellous bones and the von Mises stresses on the implant were measured. When four implants were placed on each maxilla and mandible, the maximum average stress on the cancellous bone was reduced by up to approximately three times compared with the cases of placing two implants on each maxilla and mandible. The placement of at least four implants on each maxilla and mandible improved MAD stability. It is noteworthy that the mandibular implants should be arranged adjacently to avoid stress concentration in the second molar.

中文翻译：

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完全无牙颌患者在可移动的下颌前移装置中植入植入物的有限元研究

摘要

很少有研究检查将牙种植体置入种植体支持的下颌前移装置（MAD）中以治疗完全无牙颌的阻塞性睡眠呼吸暂停的生物力学效果。这项生物力学研究旨在评估牙科植入物支持的MAD在不同数量和位置的牙科植入物中的稳定性。考虑了具有单一MAD的3D无牙颌面模型，用于各种数量和位置的植入物。在每个下颌骨和上颌骨上，将一个，两个，四个或六个植入物对称地放置在各个位置。总共考虑了42个植入物。在下颌后恢复力的作用下，对40％的突出进行了静态有限元分析。测量了皮质和松质骨上的最大和最小主应力以及植入物上的von Mises应力。当在每个上颌骨和下颌骨上放置四个植入物时，与在每个上颌骨和下颌骨上放置两个植入物的情况相比，松质骨上的最大平均应力降低了大约三倍。在每个上颌骨和下颌骨上至少放置四个植入物可以改善MAD的稳定性。值得注意的是，下颌植入物应相邻放置以避免应力集中在第二磨牙中。在每个上颌骨和下颌骨上至少放置四个植入物可以改善MAD的稳定性。值得注意的是，下颌植入物应相邻放置以避免应力集中在第二磨牙中。在每个上颌骨和下颌骨上至少放置四个植入物可以改善MAD的稳定性。值得注意的是，下颌植入物应相邻放置以避免应力集中在第二磨牙中。