Influence of chemical and mechanical polishing on water sorption and solubility of denture base acrylic resins

Autor(es)

Juliana Saab Rahal ^[1] ; Marcelo Ferraz Mesquita ^[2] ; Guilherme Elias Pessanha Henriques ^[3] ; Mauro Antonio Arruda Nóbilo ^[4]

Afiliação do(s) autor(es)

^[1] Paranaense University. Department of Prosthodontics - Brasil

^[2] State University of Campinas. School of Dentistry of Piracicaba. Department of Prosthodontics and Periodontology - Brasil

^[3] State University of Campinas. School of Dentistry of Piracicaba. Department of Prosthodontics and Periodontology - Brasil

^[4] State University of Campinas. School of Dentistry of Piracicaba. Department of Prosthodontics and Periodontology - Brasil

• Tipo de documento: Artigo Científico
• Fonte: Brazilian Dental Journal; v. 15, n. 3, p. 225-230, 2004-12-00.

Resumo

Influence of polishing methods on water sorption and solubility of denture base acrylic resins was studied. Eighty samples were divided into groups: Clássico (CL), and QC 20 (QC) - hot water bath cured; Acron MC (AC), and Onda Cryl (ON) - microwave cured; and submitted to mechanical polishing (MP) - pumice slurry, chalk powder, soft brush and felt cone in a bench vise; or chemical polishing (CP) - heated monomer fluid in a chemical polisher. The first desiccation process was followed by storage in distilled water at 37 ± 1ºC for 1 h, 1 day, 1, 2, 3 and 4 weeks. Concluding each period, water sorption was measured. After the fourth week, a second desiccation process was done to calculate solubility. Data were submitted to analysis of variance, followed by Tukey test (p<0.05). Means of water sorption (%) and solubility (%), respectively, were: CL-MP: 1.92 and 0.02; CL-CP: 1.98 and 0.52; QC-MP: 2.31 and -0.05; QC-CP: 2.32 and 0.25; AC-MP: 2.45 and -0.07; AC-CP: 2.43 and 0.41; ON-MP: 2.32 and -0.06; ON-CP: 2.34 and 0.27. Mechanical polishing promoted significantly lower solubility of acrylic resins; initially, water sorption values were higher for chemically polished samples, however, after 4 weeks all groups were similar. (AU)

• Processo FAPESP: 99/03344-3 - Influencia das tecnicas de polimerizacao e polimentos de resinas acrilicas ativadas termicamente sobre as propriedades de rugosidade superficial e absorcao de agua, em varios periodos de armazenagem.
• Beneficiário: Juliana Saab Rahal
• Modalidade de apoio: Bolsas no Brasil - Mestrado