Abstract
Abstract Introduction The staining of artificial teeth can be related to the acrylic resin abrasion caused by brushing, resulting in higher deposition of dyes from the beverage, and consequently higher aesthetic damage. Objective The aim of this in vitro study was to evaluate methods for removal of stains from acrylic denture teeth using spectrophotometric analysis. Material and method Artificial teeth were divided into twelve groups (n=10) according to the type of treatment (re-polishing - Re or immersion in Corega Tabs - Sp), staining solutions, coffee (Cf) and Coca-Cola® (Cc) or water (W) and with/without toothbrushing (B). The Sp specimens were submitted to seven immersion cycles (5 min each). The Re specimens were polished with pumice stone followed by Spain white paste. Color differences (ΔE) were captured by a spectrophotometer: T0 (baseline), T1 (after brushing/immersion in solutions) and T2 (after Re or Sp). Result Statistically significant color change between T1 and T2 (paired T-test; α =.05) was observed for the group CfSp (p=.032); and for the groups BWRe (p=.000), BCfRe (p=.049) and CcRe (p=.042). Higher color changes were observed for the specimens submitted to toothbrushing (ANOVA two way; p<.001). Conclusion It could be concluded that the immersion in sodium perborate (Corega Tabs) can be used for removal of coffee stains from denture teeth, and re-polishing for removal of Coca-Cola® stains. Still, toothbrushing produced greater color changes on denture teeth, regardless of the immersion solution.
Highlights
The staining of artificial teeth can be related to the acrylic resin abrasion caused by brushing, resulting in higher deposition of dyes from the beverage, and higher aesthetic damage
The toothbrushing test was performed in a testing machine (MAVTEC, comércio e serviços de desenvolvimento para laboratório, Ribeirão Preto, SP, Brazil), where 11,000 brushing cycles were performed on the buccal face of the artificial tooth, simulating one year of brushing[13,14]
The color change observed among the periods evaluated (T0, T1 and T2) suggests that the treatment of removing stains by immersion in Corega Tabs solution presented positive results only in the group of teeth submitted to immersion in coffee (Group CfSb)
Summary
Acrylic resin artificial teeth are frequently used for dentures fabrication due to several advantages, such as the chemical bond to the denture base, improved aesthetics and the ease of adjustment[1,2]. Clinical discoloration and extrinsic staining in acrylic resin teeth can be affected by many factors, including the type of denture tooth, dietary habits and oral hygiene of patients[2]. The staining of acrylic resin denture teeth may be removed by mechanical or chemical denture cleansing regimens[8]. Few studies evaluated methods for removing stains from beverages in acrylic resin denture teeth[8]. The aim of this study was to evaluate, by means of spectrophotometric analysis, methods for removal of stains from acrylic denture teeth. The null hypothesis was that color stability of the denture teeth would not be influenced by the procedures for removing stains during the proposed period. It was hypothesized that toothbrushing would not affect the color change of the denture teeth, regardless of the coloring beverage
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