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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Physical Properties of an Acrylic Resin after Incorporation of an Antimicrobial Monomer

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Regis, Romulo Rocha [1] ; Zanini, Ana Paula ; Della Vecchia, Maria P. [1] ; Silva-Lovato, Claudia Helena [1] ; Oliveira Paranhos, Helena Freitas [1] ; de Souza, Raphael Freitas [1]
Total Authors: 6
[1] Univ Sao Paulo, Ribeirao Preto Dent Sch, Dept Dent Mat & Prosthodont, Ribeirao Preto - Brazil
Total Affiliations: 1
Document type: Journal article
Web of Science Citations: 15

Purpose: This study evaluated the effect of the incorporation of the antimicrobial monomer methacryloyloxyundecylpyridinium bromide (MUPB) on the hardness, roughness, flexural strength, and color stability of a denture base material. Materials and Methods: Ninety-six disk-shaped (14-mm diameter x 4-mm thick) and 30 rectangular (65 x 10 x 3.3 mm(3)) heat-polymerized acrylic resin specimens were divided into three groups according to the concentration of MUPB (w/w): (A) 0%, (B) 0.3%, (C) 0.6%. Hardness was assessed by a hardness tester equipped with a Vickers diamond penetrator. Flexural strength and surface roughness were tested on a universal testing machine and a surface roughness tester, respectively. Color alterations (Delta E) were measured by a portable spectrophotometer after 12 and 36 days of immersion in water, coffee, or wine. Variables were analyzed by ANOVA/Tukey HSD test (alpha = 0.05). Results: The following mean results (+/-SD) were obtained for hardness (A: 15.6 +/- 0.6, B: 14.6 +/- 1.7, C: 14.8 +/- 0.8 VHN; ANOVA: p = 0.061), flexural strength (A: 111 +/- 17, B: 105 +/- 12, C: 88 +/- 12 MPa; ANOVA: p = 0.008), and roughness (A: 0.20 +/- 0.11, B: 0.20 +/- 0.11, C: 0.24 +/- 0.08 mu m; ANOVA: p = 0.829). Color changes of immersed specimens were significantly influenced by solutions and time (A: 9.1 +/- 3.1, B: 14.8 +/- 7.5, C: 13.3 +/- 6.1 Delta E; ANOVA: p < 0.05). Conclusions: The incorporation of MUPB affects the mechanical properties of a denture base acrylic resin; however, the only significant change was observed for flexural strength and may not be critical. Color changes were slightly higher when resin containing MUPB was immersed in wine for a prolonged time; however, the difference has debatable clinical relevance. (AU)

FAPESP's process: 08/02725-4 - Effect of the incorporation of an antiseptical monomer on color stability of a denture base acrylic resin
Grantee:Ana Paula Zanini
Support type: Scholarships in Brazil - Scientific Initiation
FAPESP's process: 07/05245-0 - Incorporation of an antiseptic monomer in a denture base acrylic resin
Grantee:Raphael Freitas de Souza
Support type: Regular Research Grants