【作者】 张颖；

【导师】 骆小平；

【作者基本信息】 南京大学 ， 口腔医学， 2021， 硕士

【摘要】 [目的]探究KATANA超透多层色氧化锆各层的光学性能以及力学性能,同时将其各层单层结构与相同厚度的氧化锆-饰瓷双层结构的光学性能进行比较,为该材料在口腔修复临床中的应用提供参考。[材料和方法]通过CAD/CAM系统从预成氧化锆坯体中按厂商规定收缩比例切削出烧结后直径为10mm的圆柱状氧化锆块、25×4mm的长方体氧化锆块以及直径为12mm的圆柱状氧化锆块。慢速切割机按比例切割分离各层,按厂商规定的烧结程序烧结,SiC砂纸打磨抛光,得到EL、TL、DL各层厚度分别为0.5、0.7、1.0、1.5mm的氧化锆圆片进行颜色参数测量,25×4×3mm的三点弯曲试件和直径12mm厚1.2mm的双轴弯曲试件。1.采用分光测色计测量各层0.5、0.7、1.0、1.5mm的氧化锆圆片的L*a*b*值(n=6),计算TP值、各层试件间的色差值ΔE,并进行比较。随机选择各层中的一个试件进行能谱分析,得到各层的元素含量。2.以各层0.5、0.7、1.0、1.5mm的氧化锆试件作为基底,在其表面堆塑饰瓷,得到最终厚度为1.5mm的双层结构试件,制备1.5mm厚度的饰瓷试件,按饰瓷厚度记为P0、P0.5、P0.8、P1.0、P1.5组(n=6)。分光测色计测量各组试件的L*a*b*值,计算TP值、各层之间的色差值ΔE,与各层1.5mm厚度的单层氧化锆试件进行比较。3.对各层三点弯曲试件以及双轴弯曲试件进行强度测试(n=10),根据相应公式计算得到各层的弯曲强度值。使用SPSS 22.0软件对得到的各组数据分别进行正态性检验、方差齐性检验后,对各组试件的TP值进行双因素分析,对各层试件的三点弯曲强度值以及双轴弯曲强度值进行单因素方差分析,检验水准:α=0.05。[结果]1.KATANA超透多层色氧化锆各层的组成成分及光学性能研究随着氧化锆厚度增加,各层试件的L*值逐渐减小,a*值和b*值相应地增大。EL、TL、DL各层的L*值依次减小,a*值和b*值依次增大。在相同厚度下,1.Omm的TL与DL层间的色差值最小,AE=2.14。EL 组 TP 值从 0.5mm 至 1.5mm 厚度分别为 17.49±0.52、16.28±0.39、13.95±0.38、11.03±0.28,TL 组为 17.59±0.43、15.88±0.10、13.14±0.40、10.51±0.43,DL 组为 17.67±0.20、15.41±0.36、13.04±0.26、9.95±0.47。同一层试件,随着厚度增加,TP值降低(P<0.05)。在相同厚度下,0.5mm的三层之间两两比较无统计学差异(P>0.05),1.0mm的TL、DL之间两两比较无统计学差异(P>0.05),其余两两比较存在显著差异。能谱分析检测EL含10.55±0.42wt%的钇元素,TL含10.34±0.16wt%,DL含10.22±0.34wt%。各层钇含量无显著差异(P>0.05)。2.KATANA超透多层色氧化锆各层的单层结构与双层结构的光学性能比较随着饰瓷厚度增加,L*值无明显变化,a*值和b*值依次增大。在相同厚度下,P0.8的TL与DL层间的色差值最小,ΔE=0.89。上饰瓷后各层之间的色差值减小。P0 的 TP值均值从EL 至DL 分别为 11.03±0.28、10.51±0.43、9.95±0.47,P0.5分别为 11.07±0.50、11.54±0.30、10.55±0.42,P0.8分别为 10.79±0.52、11.05±0.30、11.09±0.64,P1.0 分别为 11.00±0.32、11.10±0.49、11.08±0.61,P1.5为13.12±0.32。相同饰瓷厚度下,P0和P0.5的三层试件TP值之间存在统计学差异,随着饰瓷厚度增加,各层之间的TP值趋于相似。同一层试件,饰瓷厚度对EL层的TP值无明显影响,但是TL与DL不同饰瓷厚度的试件其TP值各异。3.KATANA超透多层色氧化锆各层抗弯强度的研究三点弯曲强度值分别为:EL:724.33±55.36MPa,TL:710.30±40.71MPa,DL:688.47±73.07MPa。各层试件两两比较无显著差异(P>0.05)。双轴弯曲强度值分别为:EL:627.54±47.81MPa,TL:591.70±73.54MPa,DL:617.74±46.03MPa。各层试件两两比较差异无统计学意义(P>0.05)。[结论]1.EL、TL、DL各层的钇含量相似。从EL到DL,明度降低,变红、变黄。随着厚度增加,试件表面明度降低,变红、变黄;相同厚度下EL与TL、DL之间颜色不匹配,过渡生硬。各层试件半透性随着厚度增加而降低;0.5mm厚度的三层之间的半透性相似,随着厚度增加,各层之间半透性存在显著性差异。2.上饰瓷后的双层结构试件各层之间色差减小,随着饰瓷厚度增加到1.0mm,临床上各层颜色更为匹配。上饰瓷后,过渡层和牙本质层的半透性提高。3.各层氧化锆试件的三点弯曲强度相似,各层的双轴弯曲强度相似。各层颜色及半透性的差异并未对其强度产生明显影响。更多还原

【Abstract】 [Objective]To explore the optical and mechanical properties of each layer of KATANA Super Translucent Multi-Layered zirconia,and compare color feature and the translucency of monolithic and bilayered specimens of the same thickness,providing a reliable reference for the clinical application of this material.[Material and methods]Cylindrical zirconia blocks with diameter of 10mm,rectangular zirconia blocks of 25×4mm and cylindrical zirconia blocks with diameter of 12mm were cut from the pre-formed zirconia discs by CAD/CAM system according to the manufacturer’s shrinkage ratio.Cut and separated each layer in proportion.Sintered according to the manufacturer’s sintering procedure.Polished with SiC sandpapers.Specimens with thickness of 0.5、0.7、1.0、1.5mm each layer were obtained for color measurement,the standard three-point bending specimens of 25×4×3mm and standard biaxial bending specimens with diameter of 12mm and thickness of 1.2mm were obtained for strength test.1.The color parameters L*a*b*of each group were measured by spectrophotometer(n=6),and TP(Translucency parameter)values,color difference(ΔE)values between each layer were calculated,and the ΔE and TP values between each group of specimens were compared respectively.One of the prepared zirconia specimens was randomly selected for Energy dispersive spectrometry to obtain the element content of each layer.2.The porcelain was layered on the zirconia specimens with thickness of 0.5,0.7,1.0,1.5mm to obtain the bilayered specimens with the final thickness of 1.5 mm.The porcelain specimens with a thickness of 1.5mm were prepared.The color parameters L*a*b*were measured by spectrophotometer.The TP values of each group and the ΔE between each layer were compared between the monolithic and bilayered specimens with 1.5 mm thickness of each layer.3.Three point bending strength test and biaxial bending strength test were carried out for each layer of specimens(n=10),and the bending strength of each layer were calculated according to the corresponding formula.Using SPSS 22.0 software to test the normality and homogeneity of variance of each group of data,the TP values of each group of specimens were analyzed by Two-way ANOVA,and the bending strength of each layer were analyzed by One-way ANOVA.The test level was α=0.05.[Results]1.Composition and optical properties of KATANA Super Translucent Multi-Layered zirconiaAs the thickness increased,L*values decreased,a*and b*values increased accordingly.L*values of EL、TL、DL layers decreased in turn,a*and b*values increased in turn.The color difference between the TL and DL of 1.0mm was the smallest,ΔE=2.14.The average TP values in EL group from 0.5 to 1.5mm were 17.49±0.52,16.28±0.39,13.95±0.38,11.03±0.28;TL group were 17.59±0.43,15.88±0.10,13.14±0.40,10.51 ±0.43;DL group were 17.67±0.20,15.41 ±0.36,13.04±0.26,9.95±0.47.There were significant differences in TP values between different layers(P<0.05).There were no statistical difference among the three layers of EL,TL and DL in 0.5mm(P>0.05),neither between the TL and DL(P>0.05).The yttrium content of EL was 10.55±0.42 wt%,TL:10.34±0.16 wt%,DL:10.22±0.34 wt%.By statistical analysis,the yttrium content of each layer of zirconia was similar(P>0.05).2.Comparison of optical properties between monolithic and bilayered specimens of KATANA Super Translucent Multi-Layered zirconiaWith the increase of porcelain thickness,the L*values had no obvious change,the a*and b*values increased in turn.Under the same thickness,the color difference between the TL and DL layer was the smallest,ΔE=0.89.The color difference between the layers decreased after the porcelain was layered.The TP values of P0 from EL to DL were 11.03±0.28,10.51 ±0.43,9.95±0.47;P0.5 were 11.07±0.50,11.54±0.30,10.55±0.42;P0.8 were 10.79±0.52,11.05±0.30,11.09±0.64;P1.0 were 11.00±0.32,11.10±0.49,11.08±0.61;P1.5 was 13.12±0.32.Under the same thickness of porcelain,there was statistical difference in TP values between P0 and P0.5 specimens.With the increase of thickness of porcelain,TP values among different layers tended to be similar.For the same layer,the thickness of veneering porcelain had no significant effect on the TP values of EL,but the TP values of TL and DL with different thickness of veneering porcelain were different.3.Research on flexural strength of each layer of KATANA Super Translucent Multi-Layered zirconiaThe mean three-point bending strength of EL was 724.33±55.36MPa,TL was 710.30±40.71MPa,DL was 688.47±73.07MPa.There was no significant difference among the three layers(P>0.05).The mean biaxial bending strength of EL was 627.54±47.81MPa,TL was 591.70±73.54MPa,DL was 617.74±46.03MPa.There was also no significant difference among the three layers(P>0.05).[Conclusion]1.The yttrium content of each layer of KATANA Super Translucent Multi-Layered zirconia was similar.From EL to DL,the lightness decreased and turned red and yellow.With the increase of the thickness,the surface lightness of the specimens decreased and turned red and yellow,the color difference between EL and TL,DL were all exceed the clinically acceptable range for each thickness.The translucency of each layer decreased with the increase of thickness;with the increase of thickness,the translucency of each layer had significant difference.2.The color difference between the layers of bilayered specimens was reduced,but can still be distinguished.The translucency of TL and DL were improved,tended to similar to that of EL with the same thickness.3.Bending strength of each layer was similar.The difference of color and translucency of each layer had no obvious influence on its strength.更多还原