二氧化锆色度和透光性与临床全瓷冠修复

Relationship between colorimetry and transparency of zirconia ceramic with clinical all-ceramic crown repair

目的比较2种二氧化锆的色度学指标和透光率，以指导临床修复。方法制作Vita In-CeramYZ二氧化锆试件共36块，分为6组。其中5组分别采用染色剂LLl～LL5号按照染色步骤进行染色，第6组为空白对照组，烧结后得到O．5mm厚度试件。制作厚度为0．5mm Sirona inCorisZI二氧化锆试件共30块，分为5组，每组6块。对1l组试件进行测色，指标包括L＊、a＊、b＊值和可见光积分透射比（值）。结果不论是Vita或是Sirona瓷块，随着瓷块号增加，其瓷块的明度（三＋）值亦随之下降。同时可见光积分透射比（植）亦随之下降。Vita In-Ceram YZ和Sirona InCorisZI不同颜色的二氧化锆透光率存在差异，颜色相近的瓷块透光率相似，但色度差较大。结论选择透明度高的二氧化锆材料可以更好地再现牙齿的颜色。

Objective To compare and study the colorimetry and transparency of Vita In-Ceram YZ and Sirona InCorisZI to divect clinical repair. Methods Six groups of Vita In-Ceram YZ samples were made. Five groups of samples were immersed in the Vita In-Ceram YZ staining fluid（LL1-LLS）, and the other group was the control. Five groups of Sirona InCorisZI samples were made. After sintering, the final thickness of samples was 0.5 mm. The chromatic value（L＊, a＊, b＊） and integral visible light transmittance ratio（z） of the 11 groups＇ samples were measured. Results With increasing label number, the values of L＊ and r decreased both in Vita and Sirona zirconia ceramic. Among Vita groups, there were significant differences（0 between Vita0 and Vita3, Vita4, and Vita5. Significant differences were also found between Vital and Vita3, Vita4, and Vita5. Among sirona groups, significant differences（z） were found between Sirona4.5 and Sirona0.5, Sironal, and Sirona2. Between the same and similar label numbers of Vita and Sirona zirconia ceramic, no significant difference was found in terms of the ~ value. Moreover, the AE was more than 2 NBS between the two groups, except for the Sirona4.5 and Vita4 groups. Conclusion In Vita groups or Sirona groups, the r value may differ according to the different label numbers. Between the same or similar label numbers of the two groups, no difference was found in terms of the z value. However, a difference in AE was found. High transparency zirconia materials that can better reproduce the color of teeth should be chosen for applications.