桩核材料对2种全瓷修复体颜色的影响

The influence of post-and-core material on the color of two kinds of all ceramic restoration

目的:探讨桩核材料对渗透氧化铝瓷和热压铸瓷2种全瓷修复体颜色的影响。方法:用树脂、镍铬合金、镍铬合金覆盖遮色瓷、镀金镍铬合金试件模拟桩核,采用PR-650型光谱扫描色度仪测量不同桩核背景下2种全瓷修复体试件圆心区域的L*、a*、b*值,并计算和比较组间色差。结果:2种全瓷修复体在树脂、镍铬合金、镍铬合金覆盖遮色瓷、镀金镍铬合金桩核背景下L*、a*、b*值的差异均有统计学意义(P<0.05)。渗透氧化铝瓷仅在镍铬合金桩核背景下色差值超过临床可接受水平(△E>2);热压铸瓷在镍铬合金和镀金镍铬合金桩核背景下其色差值超过临床可接受水平(△E>2)。结论:临床应用桩核-渗透氧化铝全瓷冠修复时,树脂桩核美观效果最佳,可考虑选择镍铬合金覆盖遮色瓷桩核和镀金镍铬合金桩核;应用桩核-热压铸瓷全冠修复时,最好选用树脂桩核,可考虑选择镍铬合金覆盖遮色瓷桩核,但要采取适当的遮色措施。

Objective： To study the color variation of two kinds of all ceramic material on four kinds of post-and-core materials.Methods： Background specimens simulating the post-and-core of resin,glide Ni-Cr alloy,opaque veneered Ni-Cr alloy and Ni-Cr alloy were made,the In-Ceram Alumina and IPS-Empress Ⅱ samples were overlaid on the background specimens,respectively.The color parameter L＊,a＊ and b＊ were measured with PR-650 spectrophotometer,△E values were calculated and compared.Results： The 4 post-and-core materials significantly influenced the final color of In-Ceram Alumina and IPS-Empress Ⅱ（P〈0.05）.The color difference of In-Ceram Alumina with Ni-Cr alloy and that of IPS-Empress Ⅱ with Ni-Cr alloy and glide Ni-Cr were beyond the acceptable range（△E2）.Conclusion： For In-Ceram Alumina,resin post-and-core may result in good aesthetic effect,glide Ni-Cr alloy and opaque veneered Ni-Cr alloy can be recommended.For IPS-Empress Ⅱ crown,resin post-and-core is the best choice,opaque veneered Ni-Cr alloy may be considered to use with some measures to hide the color.