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


Autoria(s): REGIS, Romulo Rocha; ZANINI, Ana Paula; VECCHIA, Maria P. Della; SILVA-LOVATO, Claudia Helena; PARANHOS, Helena Freitas Oliveira; SOUZA, Raphael Freitas de
Contribuinte(s)

UNIVERSIDADE DE SÃO PAULO

Data(s)

19/10/2012

19/10/2012

2011

Resumo

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.

Fundacao de Amparo a Pesquisa do Estado de Sao Paulo-FAPESP[2007/05245-0]

Fundacao de Amparo a Pesquisa do Estado de Sao Paulo-FAPESP[2008/02725-4]

Fundacao de Amparo a Pesquisa do Estado de Sao Paulo-FAPESP[2009/06614-5]

Identificador

JOURNAL OF PROSTHODONTICS-IMPLANT ESTHETIC AND RECONSTRUCTIVE DENTISTRY, v.20, n.5, p.372-379, 2011

1059-941X

http://producao.usp.br/handle/BDPI/26368

10.1111/j.1532-849X.2011.00719.x

http://dx.doi.org/10.1111/j.1532-849X.2011.00719.x

Idioma(s)

eng

Publicador

WILEY-BLACKWELL

Relação

Journal of Prosthodontics-implant Esthetic and Reconstructive Dentistry

Direitos

restrictedAccess

Copyright WILEY-BLACKWELL

Palavras-Chave #Local anti-infectious agents #denture bases #quaternary ammonium compounds #acrylic resins #mechanical stress #surface properties #DENTURE BASE RESIN #ANTIBACTERIAL ACTIVITY #COLOR STABILITY #DENTIN PRIMER #MDPB #COMPOSITE #CANDIDA #ADHESIVE #SURFACE #CYTOTOXICITY
Tipo

article

original article

publishedVersion