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首页> 外文期刊>The Journal of Prosthetic Dentistry >Stress distribution around maxillary implants in anatomic photoelastic models of varying geometry. Part I.
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Stress distribution around maxillary implants in anatomic photoelastic models of varying geometry. Part I.

机译：在不同几何形状的解剖光弹性模型中，上颌植入物周围的应力分布。第一部分

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STATEMENT OF PROBLEM: It is unclear which implant inclination and position are most favorable in relation to the supporting anatomy and loading direction in the maxilla. PURPOSE: This study was designed to examine stress distribution around implants in a 2-dimensional photoelastic anatomic model. MATERIAL AND METHODS: Two 2-dimensional photoelastic models were prepared with opposing 8-degree cylinder metal implant and molar teeth analogues. A frontal anatomic sectional plate model based on a CT section at the first molar was symmetrically loaded through its long axis. A midfacial rectangular model based on the same section was loaded in a different direction with varying supporting geometries. RESULTS: Stress distribution around the maxillary implant was highest in the buccal concavity at the apical buccal third and in the lingual concavity on intercuspal loading. No stress concentration occurred at the implant apex under the sinus for axial and nonaxial loading in both anatomic model geometries. On lateral loading, stress concentration was observed at the buccal concavity and at the implant neck. In the midfacial block model, principal stresses were concentrated at the maxillary implant neck on nonaxial loading and at the apex on axial loading. CONCLUSION: This 2-dimensional skull model showed different patterns of stress distribution among the maxillary implant, mandibular implant, and teeth. The highest principal stress concentration was seen at the buccal concavity of the maxillary implant; this may play a role in osseointegration with highly angled implants in the posterior maxilla. Differences in stress distribution between anatomic and nonanatomic models showed how the supporting geometry (for example, sinusasal anatomy), boundary conditions, and loading direction influence stress distribution.
机译：问题陈述：尚不清楚哪种种植体的倾斜度和位置相对于上颌的支撑解剖结构和加载方向最有利。目的：本研究旨在检查二维光弹性解剖模型中植入物周围的应力分布。材料与方法：用相对的8度圆柱体金属植入物和臼齿类似物制备了二维二维光弹性模型。在第一磨牙的CT断面建立的额叶解剖切片板模型通过其长轴对称加载。基于相同截面的中面矩形模型在不同的方向上加载了不同的支撑几何形状。结果：上颌种植体周围的应力分布在颊侧第三个颊侧的颊侧凹处最大，而在掌间负荷时舌侧的凹处最大。在两种解剖模型几何形状中，轴向和非轴向载荷下在窦下方的种植体顶点都没有应力集中。在侧向载荷下，在颊凹处和种植体颈部处观察到应力集中。在中面阻滞模型中，主应力在非轴向载荷下集中在上颌种植体颈部，而在轴向载荷下集中在顶点。结论：该二维颅骨模型显示了上颌植入物，下颌植入物和牙齿之间应力分布的不同模式。在上颌植入物的颊凹处观察到最高的主应力集中。这可能与上颌后牙高角度植入物的骨整合有关。解剖模型和非解剖模型之间的应力分布差异显示了支撑几何形状（例如，窦/鼻解剖结构），边界条件和加载方向如何影响应力分布。

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