Ujigawa K, Kato Y, Kizu Y, Tonogi M, Yamane G-Y
Department of Oral Medicine, Oral and Maxillofacial Surgery, Tokyo Dental College, Chiba, Japan.
Int J Oral Maxillofac Surg. 2007 Jul;36(7):620-5. doi: 10.1016/j.ijom.2007.03.007. Epub 2007 May 22.
The objective of this study was to analyse stress distribution in craniofacial structures around zygomatic osseointegrated implants. An integrated system for Digital Imaging and Communications in Medicine (DICOM) data were utilized to create a three-dimensional model of craniofacial structures. The amount and distribution of the main stresses were compared using three-dimensional finite elemental analysis. The system allowed visual confirmation and analysis of stress distribution as well as the convenient and simple construction of a digital biomechanical model that provided details of anatomical structures in the regions of interest. Zygomatic implants with or without connected implants supporting the superstructure were compared. Stresses in severely resorbed maxillae with connected implants were not concentrated around the alveolar bone supporting the zygomatic implants. Stresses where there were no connected implants tended to be generated in the zygomatic bone, at the middle part of the zygomatic implant and at the joint of the fixture-abutment. Stress due to occlusal forces is mainly supported by the zygomatic bone, is transferred predominantly through the infrazygomatic crest, and is divided between the frontal and temporal processes of the zygomatic bone in different directions.
本研究的目的是分析颧骨骨结合种植体周围颅面结构中的应力分布。利用医学数字成像和通信（DICOM）数据的集成系统创建颅面结构的三维模型。使用三维有限元分析比较主应力的大小和分布。该系统允许对视应力分布进行确认和分析，以及方便简单地构建提供感兴趣区域解剖结构细节的数字生物力学模型。比较了带有或不带有连接种植体以支持上部结构的颧骨种植体。带有连接种植体的严重吸收上颌骨中的应力不会集中在支持颧骨种植体的牙槽骨周围。没有连接种植体时，应力倾向于在颧骨、颧骨种植体中部以及种植体-基台连接处产生。咬合力量产生的应力主要由颧骨支撑，主要通过颧下嵴传递，并在颧骨的额突和颞突之间沿不同方向分配。
