Effect of Disposable Sheaths on the Vickers Microhardness of Resin Composites

Authors : Meltem TEKBAŞ ATAY, Mediha BÜYÜKGÖZE DİNDAR, Neslihan OZVEREN

Pages : 393-398

Doi:10.33808/clinexphealthsci.752555

View : 44 | Download : 9

Publication Date : 2021-09-27

Article Type : Research Paper

Abstract :Objective: The aim of this study was to evaluate the effect of disposable sheaths on microhardness of resin composites. Methods: A total of 40 resin composite specimens were fabricated with perspex molds insert ignore into journalissuearticles values(5x2 mm);. Specimens were divided into 4 groups: Irradiated by 1-Elipar LCU only insert ignore into journalissuearticles values(EL);, 2-Elipar LCU with sheath insert ignore into journalissuearticles values(ELS);, 3-Valo LCU only insert ignore into journalissuearticles values(VL);, 4-Valo LCU with sheath insert ignore into journalissuearticles values(VLS);, insert ignore into journalissuearticles values(n=10);. The specimens were subjected to surface microhardness insert ignore into journalissuearticles values(SMH); test insert ignore into journalissuearticles values(Tronic, Digital Microhardness Tester DHV-1000); on the top and bottom surfaces under 200 g load applied for 10 s with a Vickers indenter. The specimens were stored in the distilled water at 37 °C for 24 hours and the same measurements were repeated. One-way ANOVA test, Tukey and Tamhane post-hoc tests were used for intergroup comparisons. Also paired sample t-test was used for comparisons of the different time results. Results: According to the 1st-hour data from the top and bottom SMH measurements, EL and VL groups gave significantly higher microhardness values than VLS and ELS groups insert ignore into journalissuearticles values(p<0.05);. There was a dependent change in the top surface measurements with the time insert ignore into journalissuearticles values(p=0.000);, but also interaction with the LCU insert ignore into journalissuearticles values(p=0.000);. All groups showed significant microhardness loss from 1st to 24th-hour for both top and bottom values insert ignore into journalissuearticles values(p<0.05); except for top SMH of VLS group insert ignore into journalissuearticles values(p=0.151);. Conclusion: Disposable sheaths decreased the light output of the LCU’s and caused reduction in the SMH. Although they are effective in preventing cross-infection, they significantly reduced the polymerization efficiency, thereby mechanical properties of resin composites.
Keywords : Dental Curing Lights, Hardness, Composite Resins

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