The effect of immersion in beverages and dental bleaching agents on the surface roughness of resin composites

Abstract

Introduction: Composite materials may be exposed to chemicals in food and beverages in the oral cavity, which can lead to changes in surface roughness. The aim of this in vitro study was to evaluate the surface roughness of two restorative materials after exposure to coffee and green tea followed by a dental bleaching procedure. Methods: For nanofilled composite and microhybrid composite, 15 samples each were fabricated. Five specimens from each composite were stored in instant coffee and green tea for 4 h a day. After 30 days of immersion, specimens received dental at-home bleaching, using 16% carbamide peroxide (CP), for 7 h a day. The control group was stored in deionized water for 30 days. Surface roughness was determined by profilometry 24 h after polymerization, after 30 days of immersion, and after bleaching. The data were analyzed using a t-test for paired samples and mixed analysis of variance, at a 0.05 significance level. Results: Neither beverages nor CP treatment significantly altered the surface roughness of the composites. There was no difference between the tested composite materials regarding roughness. Conclusion: Surface roughness of the microhybrid and nanohybrid composites was not modified by coffee, green tea, and subsequent whitening treatment.

Surface Roughness of Bis-GMA Free Resin Composite in Comparison With Bis-GMA Containing Resin Composite (In-vitro Study)

“…Every day, the same amount of immersion solutions were replaced to maintain consistency and prevent microbial growth. To simulate a person's consumption of a beverage 12 , the specimens were submerged in it for 15 minutes three times a day at a specific time. After that, the samples were rinsed in water and stored in artificial saliva for the study's duration in a 37°C incubator.…”

“…After that, the samples were rinsed in water and stored in artificial saliva for the study's duration in a 37°C incubator. 6,11,12 measurement of surface roughness was done after 24 hours (T1), 2 weeks (T2) and one month (T3). 6,9,10,11 Assessment of Surface Roughness:…”