目的：评估高明度 ND1代型材料表面4种全瓷底冠光学参数 CIE L*a*b*值、透射比，烧结 A2体瓷后与 A2色片色差ΔE。方法：制作 ND1色基牙，分别戴入 Procera 氧化铝、Procera 氧化锆、Lava 氧化锆、IPS E．max 低透铸瓷底冠，分光光度比色仪拍摄并在颈1／3、体1／3、切1／3随机选点测色。4组底冠烧结 A2体瓷粉后再戴入 ND1色基牙（总瓷层厚度控制1．5 mm），分光光度比色仪测色，数据进行单因素方差分析、Bonferroni 多重均数比较。结果：4组底冠均提高基牙的 L*值，彩度a*值下降、b*值变化不一致，多数组间 L*a*b*值有统计学差异。烧结体瓷后各组冠 L*值明显下降，彩度 a*、b*值上升。各部分与 A2总体色差减小（ΔE ＝1．27～4．17）。4组底冠透光率均值依次为 E．max-LT A2＞Pro-Alu ＞Lava-Zir ＞Pro-Zir。结论：ND1基牙戴入 4组全瓷底冠后明度、彩度差异大。底冠烧结体瓷后明度差异减少，彩度差异较大。Lava-Zir 和IPS E．max 体瓷组色差超过临床可接受度。铸造陶瓷和氧化铝底冠通透性高于2种氧化锆底冠。%Objective:To evaluate the optical property of the light color core substructure ND1 overlaid by 4 different all-ceramic crowns respectively and to study the color difference between the crowns and target tab.Methods:Light color(ND1)substructures were made and were respectively tried in 4 groups of all-ceramic crowns (Procera alumina,Procera zirconia,Lava zirconia and IPS E.max glass-ceramic lithium disilicate-reinforced monolithic,n =10).The CIE L*,a*,b* values of the cervical part,body and incisal site of the samples were recorded and analyzed by a spectrophotometer before and after veneer.The color difference between the all-ceramic crowns and target A2 dentin tab was evaluated.The spectral integral transmittance of the 4 copings was measured by a spectrophotometer.Results:The L* values of the abutments was increased by all-ceramic copings of the 4 groups,a*values were decreased but b* changed inconsistently.After veneer,the L* values of all the copings declined significantly,the values of a* and b* increased.When compared with A2 tab,the ΔE of the crowns was 1.27 ~4.17.The mean value range of the transmittance of the coping was:E.max-LT A2 >Pro-Alu >Lava-Zir >Pro-Zir.Conclusion:The lightness,hue and light transmittance of the 4 ceramic copings are different.After veneer with A2 dentine,the difference of the lightness is declined but the difference of the hue is signifi-cant.The color difference of the Lava-Zir and IPS E.max is clinically unacceptable.
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