不同厚度内冠对钴铬合金烤瓷髓腔固位冠金瓷结合强度的影响  

Influence of inner crown thickness on the bonding strength of porcelain fused to Co-Cr alloy endocrown

作　　者：李学盛 李鸿波[3] LI Xuesheng; LI Hongbo(Department of Stomatology, Hainan Branch of Chinese People＇ s Liberation Army General Hospital, Sanya 572013, China)

机构地区：[1]解放军总医院海南分院口腔科,海南三亚572013 [2]海南口腔医院修复科,海南海口570105 [3]解放军总医院口腔修复科,北京100853

出　　处：《口腔医学》2018年第10期890-893,共4页Stomatology

基　　金：解放军总医院临床科研扶持基金(2017FC-WJFWZX-22);北京市科技计划(Z141100002114031)

摘　　要：目的研究内冠厚度对钴铬合金烤瓷髓腔固位冠金瓷结合强度的影响。方法选取32颗离体磨牙,随机分为4组,分别铸造0.3 mm、0.5 mm、0.8 mm、1.0 mm厚度内冠的钴铬合金烤瓷髓腔固位冠,采用万能检测机测试烤瓷冠的金瓷结合强度,扫描电镜和能谱仪分析金瓷结合界面。结果 0.3 mm、0.5 mm、0.8 mm、1.0 mm厚度内冠的剪切力强度值分别为(11.34±1.70) MPa、(11.55±1.62) MPa、(13.42±1.41) MPa和(15.21±2.85) MPa,不同厚度内冠之间的剪切力强度有统计学差异(P<0.05)。结论钴铬合金烤瓷髓腔固位冠不同厚度内冠的金瓷结合强度均能满足临床要求,临床上可根据具体情况灵活选用。但如果从修复间隙的角度考虑,在咬合间距过紧、严重磨耗等牙体修复时,可考虑使用较薄的内冠厚度。Objective To investigate the influence of inner crown thickness on the bonding strength of porcelain fused to Co-Cr alloy endocrown by shear strength test method. Methods 32 molar teeth were randomly divided into 4 groups. Co-Cr alloy endocrowns with a thickness of inner crown of 0.3 mm,0.5 mm,0.8 mm and 1.0 mm were cast respectively. The bonding strength of porcelain-metal was measured by universal testing machine,and the bonding interface was analyzed by scanning electron microscope and energy dispersive spectrometer. Result The bonding strength values of difference thicknesses of inner crown were （11.34±1.70） MPa, （11.55± 1.62）MPa,（13.42±1. 41） MPa and （15. 21 ± 2. 85） MPa respectively. Analysis of variance showed that there was statistically significant difference in the bonding strength of inner crowns with different thicknesses （P〈0.05）. Conclusion The bonding strength of porcelain fused to Co-Cr alloy endocrown varies with different thicknesses of inner crown can meet the clinical demands. The thinner inner crown is recommended to tooth defect with tight occlusion space and serious attrition from the perspective of repair space.

关 键 词：钴铬合金 髓腔固位冠 金瓷结合强度 金属烤瓷合金 

分 类 号：R783.3[医药卫生—口腔医学]