不同基底料对银汞合金修复体的应力分布影响  

Effects of cement bases on stresses and deflections in amalgam restorations

作　　者：赵守亮[1] 张少峰[1] 李芸[1] 刘晗[1] 王美青[1] 

机构地区：[1]第四军医大学口腔医学院牙体病科,陕西西安710033

出　　处：《第四军医大学学报》2003年第11期1020-1021,共2页Journal of the Fourth Military Medical University

基　　金：国家自然科学基金 (39370 1 95)

摘　　要：目的 :观察 5种基底材料对银汞合金修复体的应力水平和变形影响 .方法 :建立下颌第一磨牙二维有限元计算模型 ,基底厚度均为 0 .5mm ,银汞合金修复体厚 2mm ,采用牙合面中央集中加载 ,计算修复体底部应力水平和变形情况 .结果 :磷酸锌水门汀基底对银汞合金修复体应力水平和变形影响不明显 ;玻璃离子水门汀、氧化锌丁香油水门汀和氢氧化钙对银汞合金修复体应力分布和变形影响依次增大 .结论 :弹性模量越低 ,修复体内产生的应力越高 ,断裂的可能性越大 。AIM: To evaluate the effects of 5 kinds of base materials on the stresses and deflections in amalgam restorations. METHODS: A computerized two dimensional mandibular first molar model was established. Various cement bases with a thickness of 0.5 mm and 2 mm of amalgam restorations were simulated in the cavity preparations and subjected to a 45 kg load. The stresses and deflections in the restorations were analyzed by the finite element method. RESULTS: No significant increase in the stresses and deflections induced in the amalgam restoration was found when 0.5 mm zinc phosphate cement was placed on the cavity floor, while slight increases occurred when zinc phosphate was replaced by 0.5 mm glass ionomer or reinforced zinc oxide eugenol cement and dramatic increases were found when 0.5 mm calcium hydroxide or common zinc oxide eugenol cement was used. CONCLUSION: Modulus of elasticity of cement base plays an important role in the fracture strength of the amalgam. The lower the modulus of elasticity, the higher the stresses and deflections induced in amalgam restorations. In view of mechanical property, zinc phosphate is one of the best cement used as base material for the present.

关 键 词：基底料 银汞合金 应力 变形 

分 类 号：R781.05[医药卫生—口腔医学]