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- 2017
不同桩核对Lava锆瓷冠颜色影响的实验研究
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Abstract:
摘要 目的:研究遮色钴铬合金桩核、氧化锆桩核、纤维桩树脂核、钴铬合金金属桩核对二氧化锆全瓷冠(Lava)颜色的影响。方法:选取因牙周炎拔除的完整上颌中切牙,在釉牙骨质界冠方2.0 mm处截冠,完善根管充填治疗和桩道预备,分别制作4种不同桩核预备体各10个,每个桩核再相应制作1个Lava二氧化锆全瓷冠,内冠厚0.5 mm,饰面瓷0.7mm。采用Minolta CM一700d分光测色仪,测试4种桩核背景下Lava锆瓷冠唇面中1/3 区域L*、a*、b*值,分别进行完全随机设计的单因素方差分析和两两比较的LED检验,并根据公式计算和比较色差△E。结果:4种不同桩核背景下Lava锆瓷冠的L*、a*、b*值间差异有统计学意义(FL=136.206,PL=0.000;Fa= 3.454,Pa=0.026;Fb=6.172,Pb=0.000)。3组牙色桩核的色差则均不能为肉眼所识别(△E< 1.5),钴铬合金桩核组的色差超过临床可接受水平(△E>2)。结论:临床应用锆瓷冠(Lava)进行修复时(特别是前牙区),不建议使用金属桩核
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