The Use of Different Photoinitiator Systems in Photopolymerizing Resin Cements Through Ceramic Veneers

作者：Anyi Gaemil Schmuck Delgado, EM Castellanos, MAC Sinhoreti, DC Oliveira, Nader F. Abdulhameed, Saulo Geraldeli, TA Sulaiman, Roulet Jf · 发表于：Operative Dentistry · 年份：2018 · DOI：10.2341/17-263-l · 被引用次数：43 · 研究领域：Dental materials and restorations、Photopolymerization techniques and applications、Ocular Disorders and Treatments

SUMMARY Objective: To evaluate the effect of different photoinitiator systems on photopolymerizing resin cements through ceramic veneers with different thickness on microshear bond strength (μSBS), flexural strength (FS), and ultimate tensile strength (UTS) and verify the light attenuation through these ceramic veneers. Methods and Materials: Four photopolymerizing experimental resin cements were produced with the same resin matrix and associated with four different photoinitiator systems: camphorquinone (CQ), diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide (TPO), Ivocerin, and TPO + Ivocerin. Eighty disc-shaped ceramic veneers (IPS Empress Esthetic, Ivoclar Vivadent) were fabricated (10-mm diameter) in two different thicknesses: 0.7 and 1.5 mm. A previously characterized multiwave LED (Bluephase G2, Ivoclar Vivadent) was standardized for 40 seconds of photoactivation. Light transmittance through each ceramic veneer thickness (n=5) was measured using a spectrometer (USB 2000, Ocean Optics). The μSBS of each resin cement (n=15) to the ceramic veneer was evaluated using 0.5-mm cylinders with 0.7-mm diameters photoactivated through the different ceramic veneer thicknesses. Samples for FS and UTS tests were made either with or without ceramics veneers (0.7 and 1.5 mm) fixed to the light-curing tip. Data were submitted to two-way analysis of variance and the Tukey test (α=0.05). Results: The multiwave LED emitted higher irradiance into the blue wavelength spectra than into the vio...