Introduction. This study aimed at evaluating the effects of mouthwash solutions upon color stability, surface roughness and microhardness of a polymethyl methacrylate (PMMA) and a bis‑acryl based provisional restorative material. Materials and methods. Forty cylindrical specimens of each acrylic type [PreVISION® Temp (KULZER) and Temdent (Schütz-Dental Co.)] were prepared in a stainless-steel mold (10 mm diameter x 2 mm thick). The samples of each material were divided into four groups (n=10), according to the mouthwashes: Distilled water (DW), Listerine, Colgate Plax and Vinegar. Color measurements were made by a spectrophotometer. Surface roughness was measured with a profilometer and microhardness – with a Vickers microhardness tester. All test measurements were performed at two different time intervals: before immersion (T0) and after immersed in mouthwashes, for 72 hours (T1) of immersion. Data was analyzed by Paired simple t-test, ANOVA, Bonferroni postHoc, Spearman’s Rank Correlation tests. Results and discussion. The highest significant roughness reduction was observed for PreVISION after immersion in Vinegar and Listerine (p<0.05). For Temdent, the most significant roughness change occurred after immersion in Vinegar, however no significant differences were observed among the other solutions. As to microhardness, both acrylics’ immersion in Vinegar showed the highest microhardness value reduction, with a statistically significant difference (p<0.05). The highest ΔE values were observed in Listerine and Vinegar for PreVISION and Vinegar for Temdent, respectively. Conclusions. The higher color stability of specimens was shown by polymethylmethacrylate, compared to bis-acryl resins. Mouthwashes promote a significant change in surface roughness increase and microhardness reduction of acrylic resin.
Keywords:- discoloration
- mechanical properties
- mouthwashes.
- provisional resins