The effect of over-the-counter mouthrinses on physical properties of nanohybrid and microfilled dental composites
Idriss, Zahra Faris
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The daily use of mouthrinses may affect the optical and mechanical properties of dental composite materials. The aim of this ex vivo study was to analyze the effects of mouthrinses with different chemical compositions on the gloss, color, and hardness of two different resin composite materials (Nanohybrid and Microfilled) stored in natural human saliva. Methods: Sixty rectangular (17x7x3) mm shade A3 composite specimens (30 Tetric EvoCeram (Nanohybrid) and 30 Heliomolar (Microfilled) were cured with an LED curing light with standard high mode and a light intensity above 800 mw/cm 2 . Specimens of each composite group were arbitrary divided into three groups: the first group was stored in human pooled saliva; the second was stored in Listerine Cool Mint (containing alcohol) mixed with saliva; the third was stored in Listerine Total Care Zero (no alcohol) mixed with saliva. For a period of 1 month, the specimens were immersed for 1 minute twice daily in 10 ml of mouthrinse mixed with 1 ml saliva. In between the exposures, all specimens were re-stored in the saliva. Changes in gloss, color, and hardness of specimens between baseline and one month were evaluated. Result: A statistically significant reduction from baseline to 1 month in gloss of all groups was found. Although Listerine Cool mint caused the greatest reduction, Tetric EvoCeram showed more gloss reduction than Heliomolar overall for each mouthrinse. Also, all composite groups showed a statistically significant change in color from baseline to 1 month but the changes were not clinically predictable (Δ E ≤ 3.3) and no statistically significant difference was found in change of color for composite materials or for the mouthrinses. Hardness evaluation showed a statistically significant difference in change of hardness of the composite materials and among the mouthrinses. Heliomolar specimens showed reductions in the hardness in all three groups, but the reduction in hardness caused by Listerine Cool Mint was the most significant. In contrast, Tetric EvoCeram showed a statistically significant increase in hardness for the control and Listerine Total Care Zero mouthrinses. In conclusionmaterial types, chemicals of mouthrinses, saliva, and other factors could contribute to the alteration of composite materials' properties.