Effects of prosthesis materials and prosthesis splinting on peri-implant bone stress around implants in poor-quality bone: a numeric analysis.
Effects of prosthesis materials and prosthesis splinting on peri-implant bone stress around implants in poor-quality bone: a numeric analysis.
复制标题
假体材料和假体夹板对劣质骨种植体周围种植体周围骨应力的影响：数值分析。
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
Li
中科院分区：
文献类型：
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作者：
Tong;L. Leu;Juo;Li
目的
建立了一个由骨块和2个模拟前磨牙冠组成的三维有限元模型，该模型由2个相邻的圆柱形种植体支撑，周围没有直接的皮质骨，并用于研究静态载荷下修复材料和修复夹板对种植体周围骨应力的影响。
材料和方法
当对单个树脂、金合金或瓷冠（非夹板固定或夹板固定至相邻冠）的中心施加1 N的垂直或水平载荷时，评价种植体周围最大等效骨应力（von Mises [VM]应力）。
结果
结果表明：（1）在单冠中，不同材料在水平和垂直载荷下的最大VM应力无显著性差异;（2）水平载荷引起的最大VM应力降低，水平加载时，修复体材料由金合金或瓷改为树脂时，最大VM应力增加约14%。
讨论
在本研究分析的条件下，单冠修复材料对种植体周围骨应力的影响不显著。在水平载荷下，夹板冠降低了种植体周围的骨应力，在静态水平载荷下，金合金和瓷在夹板冠的情况下均表现出低于树脂的种植体周围的骨应力。
结论
对于骨质较差的种植体，建议使用相对坚硬的修复材料对相邻种植体的牙冠进行夹板固定。
PURPOSE
A 3-dimensional finite element model consisting of a bone block and 2 simulated premolar crowns supported by 2 adjacent cylindric implants without immediately surrounding cortical bone was generated and used to investigate the effects of prosthesis materials and prosthesis splinting on the peri-implant bone stress under static loads.
MATERIALS AND METHODS
The peri-implant maximum equivalent bone stress (von Mises [VM] stress) was evaluated when a vertical or a horizontal load of 1 N was applied to the center of a single resin, gold alloy, or porcelain crown, nonsplinted or splinted to the adjacent crown.
RESULTS
The numeric results indicated that: (1) in a single crown, no significant difference could be found in the maximum VM stress between different materials for both vertical and horizontal loading; (2) splinting the crowns reduced the maximum VM stress induced by the horizontal load, and the maximum VM stress increased about 14% for the horizontal loading when the restorative material was changed from gold alloy or porcelain to resin.
DISCUSSION
Under the condition of this study's analysis, prosthesis materials of a single crown have insignificant effects on the peri-implant bone stress. Splinting the crowns reduced the peri-implant bone stress under horizontal load, and gold alloy and porcelain each demonstrated less peri-implant bone stress than resin in the splinted crown situation under static horizontal load.
CONCLUSION
Splinting the crowns of adjacent implants with relatively stiff restorative materials is recommended for implants surrounded by poor-quality bone.