Effect of acidic beverages on surface roughness and color stability of artificial teeth and acrylic resin

Abstract

PURPOSE. The aim was to evaluate the effect of four acidic beverages on the roughness (Ra) and color change (ΔE ab) of two brands of artificial teeth and a heat-polymerized acrylic resin (HPAR) for use in a prosthetic base. MATERIALS AND METHODS. All materials were divided into 5 groups, according to the used acidic beverage (artificial saliva-control, red wine, orange juice, coke-based, and lemon juice-based soft drink). The immersion process was divided into two stages: T1-immersion in the acidic solutions for 10 minutes for 14 days; T2-after T1, the samples were immersed in grape juice for 14 days. The Ra of the samples was evaluated in a rugosimeter and the ΔE ab in a spectrophotometer, before and after the immersions. The analysis of variance of one (ΔE ab) and two factors (Ra) and Tukey were performed (α=.05). RESULTS. There was a statistical difference for roughness after immersion (T1) for Trilux and Tritone teeth, regardless of the acid solution. For Trilux teeth, all acid solutions increased Ra (P<.05). For Tritone teeth, only the coke-based soft drink did not statistically change Ra. Grape juice (T2) altered Ra only of artificial teeth (P<.05). The color was changed for all materials, after T1 and T2. CONCLUSION. In general, the acidic solutions changed the Ra and ΔE ab of HPAR and artificial teeth after T1. The grape juice altered the roughness only of the artificial teeth, promoting a clinically acceptable color change in the materials.

Color stability of 3D-printed denture resins: effect of aging, mechanical brushing and immersion in staining medium

“… 50 Secondly, it is impractical to simulate the period that the beverage is in contact with artificial dentures inside the mouth before swallowing. 51 Finally, there was no substantial comparison of the present findings with previous data due to the limited number of studies concerning the properties of 3D-printed resins, such as watersorption, surface roughness, hardness before their inclusion in routine clinical practice.…”

Thermal-cycling, simulated brushing, and beverages induced color changes and roughness of CAD/CAM poly (methyl methacrylate) denture resins

“…The highest difference in Ra from pre to post-treatment were observed with specimens immersed in low pH acidic beverages, for both materials. The high Ra of these specimens could be related with mechanical brushing in conjunction with surface disintegration of polymers under acidic environment which could exhibit a rougher surface [26]. CAD/CAM PMMA blocks are highly condensed resins with improved polishability and less porosity compared to conventional PMMA, [40] and that possibly explains the lower Ra values of C-PMMA in this study.…”

“…The consumption of common beverages and their staining effects on the dentures base materials is welldocumented [13,17,24,26,27]. The sorption property of denture base resin results in expansion of the polymer matrix, separating the polymer chains.…”

“…The staining of the materials by cola and lemon juice could be due to their low pH, which impairs the surface integrity of polymers, thereby softening the polymer surface under acidic conditions. Surface dissolution of polymeric surfaces produced by acidic chemicals in Coca-Cola and lime, such as phosphoric acid and citric acid, results in lighter appearance of the polymeric materials [26].…”

“…A roughness values exceeding 0.2 μm have found to considerably increase the plaque retention and microbial adherence. However, the Ra for denture materials between studies have varied significantly [2,26,[42][43][44], which raises the question of an agreeable roughness values for acrylic denture base materials. The measured Ra values of the material groups in the current study at baseline and following surface treatment were above the clinical threshold level of 0.2 μm but within the range (3.4 and 7.6 μm) reported by Zissis et al [42].…”