摘要
目的:比较不同基底瓷饰面瓷厚度配比对IPS e.max全瓷冠断裂载荷的影响,为临床上全瓷冠的优化设计提供参考依据。方法:加工IPS e.max类似全瓷冠试件,控制咬合面和轴壁总厚度均为1.50 mm,其基底瓷与饰面瓷厚度比分别为1∶4(a组)、1∶2(b组)、1∶1(c组)、2∶1(d组)和4∶1(e组)五组(n=60),应用Hertzian接触实验对试件进行加载,测量试件的断裂载荷并计算其平均值和标准差。结果:1∶4(a)组断裂载荷最小(3 253.13 N),4∶1(e)组最大(5 447.08 N),且随厚度配比比例增加,断裂载荷增大。经方差分析,a、b、c、d、e五组断裂载荷平均值总体差异有统计学意义(P<0.05)。两两比较结果显示:a组与c、d、e组,b组与c、d、e组之间差异有统计学意义(P<0.05);a组与b组之间,c、d、e三组之间差异无统计学意义(P>0.05)。结论:基底瓷饰面瓷厚度配比对IPS e.max全瓷冠断裂载荷有较大影响,且影响IPS e.max双层试件的断裂方式。
AIM ： To compare the effect of thickness of core/thickness of veneer ratio （Tc/Tv） on the frac- ture load of IPS e. max all-ceramic crown and provide the reference for the design of clinical porcelain . METHODS ： IPS e. max all-ceramic crown test specimens were processed. The total thickness of occlusal surfaces and axial wall was controlled to 1.50 ram. T core/T veneer = 1 ： 4 （group a）, 1 ： 2 （ group b）, 1 ： 1 （group c）, 2 ： 1 （ group d） and 4 ： 1 （group e） （n = 60）. Load was applied to occlusal surfaces of specimens with Hertzian contact experimental method. Fracture load was measured and the mean and standard deviation were calculated. RESULTS： Minimum fracture load （3 253.13 N） was in group a and maximum fracture load （5 447.08 N） was in group e. Fracture load increased with the increase of the T core/T veneer ratio. ANOVA showed significant difference among fracture loads of IPS e. max all -ceramic crown on five groups （P 〈0.05） . Significant differences were found between group a and group c, d, e, and between group b and c, d, e （P 〈 0.05 ）. No significant difference was found between group a and b, or among groups c, d and e （P 〉 0.05）. CONCLUSION. The Tc/Tv ration of IPS e. max porcelain had great influence on the fracture load and fracture mode.
出处
《牙体牙髓牙周病学杂志》
CAS
北大核心
2012年第5期280-283,301,共5页
Chinese Journal of Conservative Dentistry
