Influence of mouthwashes on the physical properties of orthodontic acrylic resin

  • Fabrício Mezzomo Collares
  • Flavia Veronezi Rostirolla
  • Érika de Oliveira Dias de Macêdo
  • Vicente Castelo Branco Leitune
  • Susana Maria Werner Samuel


Aim: The aim of this study was to evaluate the influence of acrylic resin immersion in different mouthwashes on hardness, roughness and color. Methods: Specimens of an orthodontic selfcured acrylic resin (Orto Clas®) were produced and immersed in five mouthwashes: Plax®Classic (Colgate®); Plax® alcohol-free (Colgate®); Listerine® (Johnson & Johnson®); Periogard® (Colgate®) and Periogard® alcohol-free (Colgate®). Nine different immersion times were studied: 1, 2, 4, 6, 8, 10, 12, 24 h and 7 days, totalizing 45 groups. The specimens were evaluated before and after immersion by Knoop microhardness (n=5), roughness in Ra parameter (n=5), and colorimetric analysis, CIElab (n=3). Results: All mouthwashes softened the acrylic resins after 7 days of immersion. PlaxÒ alcohol-free showed no statistically significant difference of softening between the immersion times. Listerine® showed softening after immersion at all times. Plax®alcohol-free and Listerine® showed significantly increased values of roughness after 12 h of immersion (p<0.05). Listerine® presented a significant increase in color variation after 12 h of immersion. Conclusions: Immersion in mouthwashes could influence acrylic resin hardness, roughness and color.


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How to Cite
COLLARES, Fabrício Mezzomo et al. Influence of mouthwashes on the physical properties of orthodontic acrylic resin. Brazilian Journal of Oral Sciences, [S.l.], p. 203-208, dec. 2016. ISSN 1677-3225. Available at: <>. Date accessed: 17 july 2019.
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