Influence of Light Irradiation Through Zirconia on the Degree of Conversion of Composite Cements
Influence of Light Irradiation Through Zirconia on the Degree of Conversion of Composite Cements
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DOI：
10.3290/j.jad.a35842
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发表时间：
2016-01-01
影响因子：
3.3
通讯作者：
Van Meerbeek, Bart
中科院分区：
文献类型：
--
作者：
Inokoshi, Masanao;Pongprueksa, Pong;Van Meerbeek, Bart
目的：评估两种光固化装置的光辐照度（LI），并测量三种复合水泥和一种可流动复合材料在不同厚度的氧化锆或陶瓷贴面氧化锆板上固化时的转化率（DC）。材料与方法：研究了三种双固化复合水泥（Clearfil美学水泥、Panavia F2.0、G-CEM LinkAce）和一种光固化可流动复合水泥（G-aenial Universal Flo）。采用三种不同厚度的氧化锆（0.5 mm和1.5 mm厚的氧化锆，以及0.5 mm厚的氧化锆覆以1.0 mm厚的单板陶瓷）制备了9种不同的氧化锆板（YSZ: Aadva和KATANA； Ce-TZP/Al2O3: NANOZR）。将部分混合的复合水泥和可流动的复合材料置于光度计上测量LI，同时使用两个光固化单元（n = 5）通过氧化锆板光固化40 s。光固化后，获得复合膜在5和10 min、1和24 h以及1周时的微拉曼光谱，以确定DC。结果：氧化锆等级和氧化锆/单板厚度显著降低LI。增加的LI不增加DC。只有Ce-TZP/Al2O3 （NANOZR）氧化锆不透明，不能充分透光，导致DC明显降低。结论：虽然氧化锆基修复体会减弱光固化单元的LI，但通过YSZ氧化锆可以实现复合胶结物和可流动复合材料的光固化。通过Ce-TZP/Al2O3氧化锆的LI过低，需要使用自固化/双固化复合水泥。
Purpose: To assess the light irradiance (LI) delivered by two light-curing units and to measure the degree of conversion (DC) of three composite cements and one flowable composite when cured through zirconia or ceramic-veneered zirconia plates with different thicknesses.Materials and Methods: Three dual-curing composite cements (Clearfil Esthetic Cement, Panavia F2.0, G-CEM LinkAce) and one light-curing flowable composite (G-aenial Universal Flo) were investigated. Nine different kinds of zirconia plates were prepared from three zirconia grades (YSZ: Aadva and KATANA; Ce-TZP/Al2O3: NANOZR) in three different thicknesses (0.5- and 1.5-mm-thick zirconia, and 0.5-mm-thick zirconia veneered with a 1.0-mm-thick veneering ceramic). Portions of the mixed composite cements and the flowable composite were placed on a light spectrometer to measure LI while being light cured through the zirconia plates for 40 s using two light-curing units (n = 5). After light curing, micro-Raman spectra of the composite films were acquired to determine DC at 5 and 10 min, 1 and 24 h, and at 1 week.Results: The zirconia grade and the thickness of the zirconia/veneered zirconia plates significantly decreased LI. Increased LI did not increase DC. Only the Ce-TZP/Al2O3 (NANOZR) zirconia was too opaque to allow sufficient light transmission and resulted in significantly lower DC.Conclusion: Although zirconia-based restorations attenuate the LI of light-curing units, the composite cements and the flowable composite could be light cured through the YSZ zirconia. LI is too low through Ce-TZP/Al2O3 zirconia, necessitating the use of self-/dual-curing composite cements.