摘要
不同表面粗糙度的烤瓷用金属与牙本质之间粘结强度的效果评价研究
目的：比较不同表面粗糙度的镍铬合金、钛合金以及钴铬合金与牙本质之间粘结强度的差别。
方法：三种金属铸件各30个,每种金属随机平均分为6组,分别用60目、80目、100目、150目、240目、320目的碳化硅砂纸打磨粘结面,测定打磨后铸件的表面粗糙度Ra值(轮廓算术平均偏差)。收集1个月内拔除的人新鲜离体磨牙90颗,在流水冲洗下去除牙合面釉质暴露浅层牙本质,随机平分为三个大组,每大组随机平分为6小组,依次用320目、400目、600目碳化硅水磨砂纸打磨牙本质粘结面。利用Ketac TM Cem Easymix玻璃离子水门汀将打磨后的金属铸件和牙本质粘结,经37℃恒温水浴24h后,用万能试验机检测其微拉伸粘结强度。应用SPSS13.0统计分析软件对所得数据进行方差分析,对组间均数的多重比较采用SNK-q法进行统计学分析。以钴铬合金为例,应用扫描电镜观察试件的断裂界面的结构变化,定性分析断裂发生部位与粘结强度的关系。
结果：①镍铬合金组中,不同表面粗糙度的金属与牙本质之间的粘结强度有统计学差异(F=8.837,P<0.001),其中,150目组与其他各组之间具有统计学差异(p<0.05),其余各组中,240目组与320目组之间有统计学差异(p<0.05),其他各组之间无统计差异。
②钛合金组中,不同表面粗糙度的金属与牙本质之间粘结强度有统计学差异(F=26.501,P<0.001),其中,80目组与320目组分别与其他各组之间具有显著统计学差异(p<0.05)；其余组中,60目组与150目组、240目组之间有统计学差异(p<0.05)；而100目组、150目组和240目组之间无统计差异(p=0.267>0.05)。
③钴铬合金组中,不同表面粗糙度的金属与牙本质之间粘结强度有有统计学差异(F=3.849,P=0.011<0.05)。其中,150目组与其他各组之间具有显著统计学差异(p<0.05)；其余各组之间无统计学差异(p=0.628>0.05)。
④金属与牙本质之间的粘结强度的差异不仅受金属表面粗糙度不同的影响(F=14.048,p<0.001),还受金属性质不同的影响(F=61.127,p<0.001),两因素之间的交互作用也影响了金属与牙本质之间的粘结强度(F=10.322,p<0.001)。
⑤通过扫描电镜观察,不同表面粗糙度的金属与牙本质粘结经拉伸试验断裂后其断裂界面有所不同。
结论：
①烤瓷用金属的表面粗糙度对其与牙本质之间的粘结强度有影响。
②不同烤瓷用金属与牙本质之间粘结强度不同。
③镍铬合金和钴铬合金经150目砂纸打磨后与牙本质之间的粘结强度显著增大,其表面粗糙度(Ra值)分别为2.14±0.25μm,2.05±0.18μm。钛合金经80目砂纸打磨后与牙本质之间的粘结强度显著增大,其表面粗糙度(Ra值)为2.69±0.32μm。
Objective:To compare the bond strength between Ni-Cr alloy, Titanium alloy, Co-Cr alloy with different surface roughness and dentin respectively.
Methods:The Ni-Cr alloy, Titanium alloy, Co-Cr alloy were collected for the experiment. Every kind of them was 30 pieces and they were randomly devided into 6 groups,5 samples for each group. All groups of specimens were rubbed separately with 60,80,100,150,240,320 grit silicon carbide sand paper, then surface routhness of each group was measured. The occlusal surfaces of 90 freshly extracted human molars were flattened to expose an adequate area of lower dentin. Followed by wet-grinding on a series of Si-C sand paper from number 320,400,600 grit to produce the dentin bonding surface, then divided randomly into 18 groups. Each alloy and dentin specimens were bonded with Ketac TM Cem Easymix GIC bonding system. All bonded specimens were stored in 37℃distilled water for 24 hours, and tested under microtensile loading until fracture on the universal testing machine. The bond strength of each group was analyzed by using SPSS13.0 Microsoft ANOVA test. The differences among mean values were compared by Student-Newman-Keuls multiple comparison test. Take Co-Cr alloy specimens for example, the fractured surface of alloy were observed with scanning electron microscope.
Results:①In Ni-Cr alloy groups, ANOVA detected statistically significant differences between sub-groups (F=8.837, P<0.001). The post SNK-q test showed that,the bond strengths of 150 grit group were significantly higher than other groups (p<0.05). In other groups, the bond strengths between 240 grit and 320 grit groups were statistically different (p<0.05).②In Ti alloy groups, ANOVA detected statistically significant differences between sub-groups (F=26.501, P<0.001). The post SNK-q test showed that,the bond strengths of 80 grit and 320grit groups were significantly different to other groups (p<0.05). In other groups, the bond strengths among 60 grit,150 grit and 240grit groups were statistically different (p<0.05).There were no statistically differences among 100grit,150grit and 240grit groups (p=0.267>0.05).③In Co-Cr alloy groups, ANOVA detected statistically significant differences between sub-groups (F=3.849, P=0.011<0.05). The post SNK-q test showed that,the bond strengths of 150 grit group were significantly higher than other groups (p<0.05). There were no statistically difference among other groups (p=0.628>0.05).⑤Broken surface of alloy specimens in this group were observed with scanning electron microscope showing the sectional surfaces with different surface roughness were different.④The bond strength between alloy and dentin was affected not only by surface roughness of alloy (F=14.048, p<0.001),but also by the kinds of alloy (F=61.127, p<0.001);The interaction of the two factors can affect the result too (F=10.322, p<0.001).
Conclusions:
①, The surface roughness could affect the bond strength between alloy and dentin.
②, The bond strength between different alloys and dentin was different.
③, Ni-Cr alloy and Co-Cr alloy rubbed with 150 grit Si-C sand paper, separately with 2.14±0.25μm and 2.05±0.18μm surface roughness(Ra) bonded to dentin showed the maximum bond strength. Ti-alloy rubbed with 80 grit Si-C sand paper, with-2.69±0.32μm surface roughness(Ra) bonded to dentin showed the maximum bond strength.
引文
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