钴铬合金烤瓷髓腔固位冠边缘设计对内冠适合性影响的研究  

Effect of finish line design on innercrown adaptation of porcelain fused to Co-Cr alloy endocrowns

作　　者：李学盛 郭靖[1] 王潇宇[1] 赵彤[2] 李鸿波[1] 

机构地区：[1]解放军总医院口腔医学中心,硕士生北京100853 [2]中国科学院大学数学科学学院,副教授北京100049

出　　处：《中华老年口腔医学杂志》2016年第2期92-95,共4页Chinese Journal of Geriatric Dentistry

基　　金：国家自然科学基金(项目编号:3081307);北京市科技计划项目(项目编号:Z141100002114031)

摘　　要：目的:探讨钴铬合金烤瓷髓腔固位冠内冠边缘设计对适合性的影响。方法:根据磨牙平均解剖数据建立材料学研究简化模型,制作不同边缘设计的钴铬合金烤瓷髓腔固位冠,即对接型、直角型、凹面型、135°边缘设计,每组试件各8个。采用硅橡胶印模复制法在体式显微镜下测量记录内冠和基牙间各部位间隙的大小,然后对各组不同部位的间隙大小之间的差异采用单因素方差统计分析,得出内冠适合性最佳的边缘设计。结果:4组不同边缘设计的钴铬合金烤瓷髓腔固位冠内冠各部位适合性的平均值分别为53.76±23.42μm、59.18±16.33μm、61.19±25.43μm、60.82±30.72μm,经方差分析,无统计学差异(P>0.05)。在边缘间隙处,4种边缘设计的适合性的平均值分别为66.41±18.19μm、56.60±14.95μm、74.62±18.55μm、58.08±13.53μm,经方差分析,直角型与凹面型、凹面型与135°之间有统计学差异(P<0.05)。结论:不同边缘设计可以影响钴铬合金烤瓷髓腔固位冠内冠的适合性,直角型边缘设计的边缘适合性最好,平面对接式设计的整体适合性最佳。Objective： To evaluate the effect of four different finish line designs on the adaptation of inner crowns of porcelain fused to Cobalt-chromium alloy endocrowns. Material and methods： According to molar average anatomical data to get simplified model for mandibular first molar endocrowns with four finish line designs： flat margin, 90？ shoulder,chamfer shoulder and 135° shoulder. Eight inner crowns of porcelain fused to Co-Cr alloy endocrowns were fabricated for each finish line design group. Adaptations between the inner crowns and the abutment teeth were duplicated by siliconeimpression method, and the thickness of silicone rubber was evaluated at the margin, the occlusal-axial corner, the axial wall, and the subface by a stereomicroscope. Data among the four different groups were statistically analyzed using one-way ANOVA（α=0.05）. Results： The means of universal adaption of different finish line designs were 53.76±23.42μm,59.18 ±16.33μm, 61.19 ±25.43μm, 60.82 ±30.72μm for flat margin, 90° shoulder, chamfer shoulder and 135° shoulder respectively. As to the marginal fitness, the mean values were 66.41 ±18.19μm, 56.60±14.95μm, 74.62±18.55μm, 58.08±13.53μm in sequencing. No significant difference in universal adaption means was found among the four groups（P〈0.05）,while significant difference between groups was observed in the values of the margin, that there is significant difference between 90° shoulder and chamfer, chamfer and 135° shoulder（P〈0.05）. Conclusion： According to this study, the adaptation of the inner crowns of Co-Cr metal-porcelain endocrowns was affected by finish line design. The metal coping with 90° shoulder had the best marginal adaption, whereas the flat margin showed the best universal adaption.

关 键 词：钴铬合金 髓腔固位冠 适合性 肩台 金属烤瓷合金 

分 类 号：R783.3[医药卫生—口腔医学]