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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 II.
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Stress distribution around maxillary implants in anatomic photoelastic models of varying geometry. Part II.

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。第二部分

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STATEMENT OF PROBLEM: Insufficient buccal bone volume can be a significant problem when loading dental implants in the maxilla. Increased potential for buccal fenestration and dehiscence can result in an exposed implant surface, mucosal irritation, decreased support, and potential implant failure. PURPOSE: The objective of this study was to model the stress distribution around maxillary implants by comparing simulated occlusal loading of maxillary implants in a 2-dimensional photoelastic anatomic model and a dry skull model. MATERIAL AND METHODS: Two model systems were used. First, a 2-dimensional photoelastic anatomic frontal skull sectional model was prepared in the first molar region. Left and right maxillary metal cylinder implant analogues inclined at 0 and 25 degrees to the sagittal plane were loaded in simulated intercuspation. Second, a dry skull lined with a photoelastic coating on the buccal aspect over an embedded cylinder implant was prepared in the first molar region. Principal stress concentration was photographed on axial and nonaxial implant loading. RESULTS: On simulated intercuspal loading, maximum stress concentration occurred at the buccal concavity in both the 2-dimensional anatomic photoelastic and skull models. There was no stress concentration at the apices of the maxillary implants in the 2-dimensional model. On lateral loading of the skull model, stress was distributed along the entire buccal aspect of bone adjacent to the implant, with a higher concentration at the buccal concavity. CONCLUSION: Preservation of buccal supporting bone volume is desirable to obtain a physiological modeling response and to enhance the facial plate. Insufficient bone volume may result in buccal fenestration or dehiscence, which can precipitate mucosal irritation, decreased support, and potential implant failure.
机译：问题陈述：当在上颌骨中装载牙齿植入物时，颊骨体积不足可能是一个重大问题。颊开窗和裂开的可能性增加可能导致植入物表面暴露，粘膜刺激，支撑减少以及潜在的植入物衰竭。目的：本研究的目的是通过在二维光弹性解剖模型和干颅骨模型中比较上颌植入物的模拟咬合载荷来模拟上颌植入物周围的应力分布。材料与方法：使用两个模型系统。首先，在第一磨牙区制备二维光弹性解剖额叶解剖模型。在模拟咬合中加载与矢状面倾斜0度和25度的左右上颌金属圆柱体植入物类似物。第二，在第一磨牙区中制备在颅骨面内嵌有光弹性涂层的干燥颅骨，该颅骨在嵌入式圆柱体植入物上。在轴向和非轴向植入物载荷下拍摄主应力集中。结果：在模拟的牙掌间负荷下，二维解剖学光弹性模型和颅骨模型的颊侧凹处最大应力集中发生。在二维模型中，在上颌植入物的顶点处没有应力集中。在颅骨模型的横向载荷下，应力沿与植入物相邻的整个骨骼颊面分布，在颊凹处的应力较高。结论：保存颊侧支撑骨体积对于获得生理模型反应和增强面盘是理想的。骨量不足可能会导致颊开窗或裂开，从而引起粘膜刺激，支撑减少和潜在的植入失败。

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