Surface properties of multilayered, acrylic resin artificial teeth after immersion in staining beverages

Abstract

Objective To evaluate the effect of staining beverages (coffee, orange juice, and red wine) on the Vickers hardness and surface roughness of the base (BL) and enamel (EL) layers of improved artificial teeth (Vivodent and Trilux).Material and Methods Specimens (n=8) were stored in distilled water at 37°C for 24 h and then submitted to the tests. Afterwards, specimens were immersed in one of the staining solutions or distilled water (control) at 37°C, and the tests were also performed after 15 and 30 days of immersion. Data were analyzed using 3-way ANOVA and Tukey’s test (α=0.05).Results Vivodent teeth exhibited a continuous decrease (p<0.0005) in hardness of both layers for up to 30 days of immersion in all solutions. For Trilux teeth, similar results were found for the EL (p<0.004), and the BL showed a decrease in hardness after 15 days of immersion (p<0.01). At the end of 30 days, this reduction was not observed for coffee and water (p>0.15), but red wine and orange juice continuously reduced hardness values (p<0.0004). Red wine caused the most significant hardness changes, followed by orange juice, coffee, and water (p<0.006). No significant differences in roughness were observed for both layers of the teeth during the immersion period, despite the beverage (p>0.06).Conclusions Hardness of the two brands of acrylic teeth was reduced by all staining beverages, mainly for red wine. Roughness of both layers of the teeth was not affected by long-term immersion in the beverages.

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

“…19 The roughness also influences optical properties and microbial adhesion, causing an increase of the surface area, favoring the mechanical retention of pigments and biofilm. 6,11 In the present study, roughness results after immersion in the coke-based soft drink were found statistically equal to the initial for the Tritone teeth. However, it is important to note that, in the initial period, the Tritone teeth was rougher (mean of 1.86 μm).…”

“…10 The low pH of these beverages can be responsible for the degradation of the artificial teeth and the acrylic base, inducing color changes, wear and surface irregularities, consequently reducing the prosthesis life. 11 The surface smoothness acts not only on the esthetic characteristics but also on the durability since the irregularities make it difficult for the cleaning procedure, promoting staining and eventually a decrease of the mechanical properties. 9 The use of potentially aggressive beverages should be identified, and the patient should be informed to avoid or reduce the frequency of their consumption, to extend the longevity of these prostheses.…”

The Effect of a Continuous Mechanical Polishing Protocol on Surface Roughness, Biofilm Adhesion, and Color Stability of Acrylic Resin Artificial Teeth

“…Polymer solubility may be affected by alimentary and hygiene solutions depending on pH, polarity of liquids, time of contact with materials, and the presence of specific pigments, These aqueous solutions act through the process of absorption, causing a plasticizing effect on the surface, forming micro‐cracks, thus leading to structural degradation over time . Furthermore, denture brushes and toothpastes have the potential to damage the material surface by means of attrition and abrasion generated during brushing, thereby, increasing the roughness of the surfaces, regardless of the quality of polishing and initial smoothness …”

“…However, acrylic resin's low abrasion resistance and color stability may lead to an occlusal imbalance and esthetic problems . Daily brushing, chewing, the use of hygiene solutions and the consumption of common drinks such as coffee, tea, soda, wine, and juices, can degrade the acrylic resin, damaging important properties such as color and surface roughness, subsequently reducing the lifespan of the prosthesis both esthetically and functionally, as well as decreasing the hygiene effectiveness of its users.…”

Effect of immersion in various disinfectant solutions on the properties of a heat-cured acrylic resin

“…The polymerization cycle consisted of heating to 100°C the water in the container used for the heat-curing, turning off the flame, placing the kiln in water and leaving it for 15 minutes. Afterwards, the heat was once again turned on until it reached 100°C and the kiln was kept in place for a further 20 minutes [12]. The microwave remained immersed in water until it had cooled to room temperature.…”