骨水平对围绕四对四概念的应力分布的影响:一个3D有限元素分析
1Hacettepe University Faculty of Dentistry, Oral and Maxillofacial Surgery Department, Ankara, Turkey.
概括
在全对四概念中,更深的植入物放置可以减少植入物和骨的压力. 最佳的压力减轻涉及前部植入物的子位安置和后部植入物的马位安置,保持皮层骨支持.
科学领域:
- 生物材料和生物力学
- 牙科植入物学 牙科植入物学
- 有限元分析 有限元分析
背景情况:
- "全对四"概念是全面门康复的流行的治疗方法.
- 了解植入物周围的压力分布对于长期成功至关重要.
- 与骨相对的植入物放置深度可能会影响压力模式.
研究的目的:
- 通过有限元分析,研究不同植入物放置深度 (equicrestal,subcrestal) 对All-on-Four概念中的应力分布的影响.
- 在功能负荷下评估植入物,植入物碎片和周围骨的压力.
主要方法:
- 创建了一个有限元分析 (FEA) 模型,模拟了四种植入物 (两个轴前部,两个倾斜后部) 的四个植入物 (All-on-Four) 概念.
- 植入物被放置在equicrestal (EC),1毫米下 (SC1) 和2毫米下 (SC2) 的水平.
- 在组功能阻塞下,对一个全门假肢施加了450N的负荷.
主要成果:
- 更深入的植入物放置通常会降低植入物和碎片中的Von Mises应力.
- 在SC-2组 (缺乏皮层骨支持) 观察到最高的骨压力 (Pmax),前部区域的值更高.
- 最低的骨压力记录在SC-1前部植入物和EC后部植入物.
结论:
- 没有皮质骨支的植入物放置会导致压力转移到植入周边骨的增加.
- 最佳的压力最小化是通过将前部植入物放置在脊顶深处,同时保持皮质支持来实现的.
- 后侧倾斜的植入物可能受益于尖顶位置,以减少压力.
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