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

Brazilian Dental Journal

Juliana Saab Rahal²  Marcelo Ferraz Mesquita¹  Guilherme Elias Pessanha Henriques¹  Mauro Antonio Arruda Nóbilo¹ 

[1] ,Paranaense University Department of Prosthodontics Umuarama PR ,Brazil

关键词: acrylic resin;    water sorption;    solubility;    chemical polishing;    mechanical polishing;   

DOI  :  10.1590/S0103-64402004000300012

来源: SciELO

【 摘 要 】

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.

【 授权许可】

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