Dolve Eran, Ben-Izhack Gil, Meirowitz Avi, Erel Hadar, Rosner Ofir, Biadsee Ameer, Lugassy Diva, Shely Asaf
Department of Oral Rehabilitation, the Maurice and Gabriela Goldschleger School of Dental Medicine, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv 6997801, Israel.
Materials (Basel). 2023 Mar 2;16(5):2057. doi: 10.3390/ma16052057.
The purpose of the study was to evaluate the changes of light reflection% on two materials (monolithic zirconia and lithium disilicate) after using two external staining kits following by thermocycling.
Specimens were sectioned from monolithic zirconia (n = 60) and lithium disilicate ( = 60) then divided into six groups ( = 20). Two different types of external staining kits were used and applied to the specimens. The light reflection% was measured before staining, after staining and after thermocycling using a spectrophotometer.
The light reflection% of zirconia was significantly higher compared to lithium disilicate at the beginning of the study ( = 0.005), after staining with kit 1 ( = 0.005) and kit 2 ( = 0.005) and after thermocycling ( = 0.005). For both materials, the light reflection% was lower after staining with Kit 1 compared to kit 2 ( < 0.043). After thermocycling, the light reflection% of lithium disilicate increased ( = 0.027) and was unchanged with Zirconia ( = 0.527).
There is a difference between the materials regarding light reflection% as the monolithic zirconia showed higher light reflection% comparing lithium disilicate throughout the entire experiment. For lithium disilicate, we recommend using kit 1 as we found that, after thermocycling, the light reflection% of kit 2 was increased.
本研究的目的是评估在热循环后使用两种外部染色试剂盒对两种材料（整体式氧化锆和二硅酸锂）进行染色后光反射率的变化。
从整体式氧化锆（n = 60）和二硅酸锂（n = 60）上切取标本，然后分为六组（每组n = 20）。使用两种不同类型的外部染色试剂盒并应用于标本。在染色前、染色后和热循环后使用分光光度计测量光反射率。
在研究开始时（P = 0.005）、用试剂盒1染色后（P = 0.005）、用试剂盒2染色后（P = 0.005）以及热循环后（P = 0.005），氧化锆的光反射率显著高于二硅酸锂。对于两种材料，与试剂盒2相比，用试剂盒1染色后光反射率较低（P < 0.043）。热循环后，二硅酸锂的光反射率增加（P = 0.027），而氧化锆的光反射率无变化（P = 0.527）。
在整个实验过程中，整体式氧化锆的光反射率高于二硅酸锂，两种材料在光反射率方面存在差异。对于二硅酸锂，我们建议使用试剂盒1，因为我们发现热循环后试剂盒2的光反射率增加。
