Viscoelastic properties of denture base resins obtained by underwater test

Hiromori, K.; Fujii, Koichi; Inoue, Kouichi

doi:10.1046/j.1365-2842.2000.00545.x

Cited by 30 publications

(20 citation statements)

References 15 publications

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“…It is important because it causes plasticization, lowering of the glass transition temperature (Tg) and may affect the mechanical properties and dimensional stability [30]. It also subjects the material to internal stresses that may result in crack formation and, eventually, fractures [31]. Based on the results of this study, Parylene-C coated PMMA presented with statistically reduced Wsp compared to uncoated PMMA.…”

Section: Water Sorptionmentioning

confidence: 78%

The Effect of Parylene-C Coating on the Surface Free Energy, Water Sorption, Solubility and Staining of PMMA

2014

J Chem Appl

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Background and objective: Parylenes are conformal protective polymer coating materials utilized in various biomedical applications since they are chemically and biologically inert and stable. Acrylic resins, used in the manufacturing of different types of intra-oral prostheses, are vulnerable to fluid sorption and solubility and consequently alteration of different physical and mechanical properties. This study investigated the effect of surface coating of polymethyl methacrylate (PMMA) with Parylene-C, on surface free energy, water sorption, solubility, and staining.Methods: Specimens were fabricated using heat-polymerizing PMMA, half were randomly chosen to be coated with Parylene-C and various groups were created for testing as follows: 24 specimens were subjected to water sorption and solubility tests in distilled water according to ISO 20795-1:2008 for denture base polymers. 48 specimens underwent staining tests by soaking in distilled water or coffee solution for one week. Discoloration was measured by comparing total colour differences (ΔE) and lightness values (L*) across groups after obtaining CIE L*a*b* values of all samples using a digital camera imaging and appropriate image analysis software. A further 40 samples were subjected to contact angle readings using deionized water and glycerol followed by surface free energy calculations. Nonparametric Mann-Whitney tests were used for statistical analysis (P<0.01).Results: Coated PMMA specimens demonstrated significantly less water sorption and lower surface free energy compared to noncoated (P <0.001), while no significant difference was found in solubility (P= .028). The coating did not have a significant effect on ΔE values after the staining tests, but the L* values in coated samples were significantly higher compared to the uncoated ones.Significance: This study forms part of a series of experiments on the effect of Parylene coating of PMMA. The modified surface properties of coated PMMA may prolong the lifetime of intraoral prostheses and possibly reduce biofilm formation.

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Section: Water Sorptionmentioning

confidence: 78%

The Effect of Parylene-C Coating on the Surface Free Energy, Water Sorption, Solubility and Staining of PMMA

2014

J Chem Appl

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“…The water taken up in polymer acts as plasticizer and leads to decreased mechanical properties. (9,19,20) The results also showed that the microwave curing method gave a higher surface hardness value (112.137±3.02 for Major and 113.175±1.54 for QD) than the water bath curing method for the control groups, without relining (109.85±3.93 for Major and 111.312±2.339 for QD). These results were in agreement with other authors.…”

Section: Surface Hardness Testmentioning

confidence: 82%

Effect of Relining Curing Methods on Some Properties of Acrylic Resin Denture Base (Part II)

Hatim¹,

AL-Omari²

2013

RDENTJ

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Aims: To investigate the effect of relining by using two curing methods (water bath, or microwave) on some properties ( surface hardness, color property, residual monomer, and porosity) of relined acrylic resin denture base. Materials and methods: The study was done by preparing 320 samples, divided into two parts, the first part involved studying surface hardness, color property, residual monomer, and porosity of samples representing a denture base cured by water bath curing method, and the samples of second part cured by microwave curing method, then the effect of relining by the two curing methods (water bath, and microwave) were evaluated. Samples with dimensions of 30×15×3 ± 0.03mm for the indentation hardness test, 45×10×2.5mm for the color property test, 20×20×3mm for residual monomer test were prepared in this study. Analysis of variance (ANOVA) and Duncan's multiple range tests were used for statistical analysis. Results: surface hardness of denture base cured by microwave was significantly higher (at P=0.05) than denture base cured by water bath, all the relined samples has significant higher absorbance, and showed that the elusion of monomer was higher at the 1 st day. Conclusions: Surface hardness, color property and residual monomer of the acrylic resin denture base were affected by relining. Microwave curing method gave better mechanical, and physical properties of the relined acrylic resin denture base, the amount of residual monomer was less in the microwave curing method. Both curing methods gave samples free from porosities.

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“…On this note, Hiromori et al 29) stated that PMMA denture base polymer reaches saturation about 30 days after immersion.…”

Section: Discussionmentioning

confidence: 99%

Deformation and Flexural Properties of Denture Base Polymer Reinforced with Glass Fiber Sheet

Kanie

Arikawa

Fujii

et al. 2005

Dental Materials Journal

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The purpose of this study was to investigate the deformation and flexural properties of acrylic and urethane polymers reinforced with glass fiber sheet. Four types of specimen -self-curing resin plate (R) , light-curing oligomer plate containing a reinforcement (GO) , and self-curing resin plate containing a reinforcement on one (GR) or both (GRG) sides -were prepared with three thicknesses: 1.5, 2.4, and 3.0 mm. Gaps between polymerized test specimen and a standard metal plate were measured at the corner (C) , middle of the long sides (LS) , and middle of the short sides (SS) . The gaps for R were 0-2.0 pm. GO and GR markedly deformed at Points C, LS, and SS, and the degree of deformation increased as GO became thinner. Flexural strength was significantly increased by the reinforcement (p<0.05) . The flexural moduli of 3.0-mm thick R, GO, and GR were significantly smaller than that of 1.5-mm thick specimens.

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Viscoelastic properties of denture base resins obtained by underwater test

Cited by 30 publications

References 15 publications

The Effect of Parylene-C Coating on the Surface Free Energy, Water Sorption, Solubility and Staining of PMMA

The Effect of Parylene-C Coating on the Surface Free Energy, Water Sorption, Solubility and Staining of PMMA

Effect of Relining Curing Methods on Some Properties of Acrylic Resin Denture Base (Part II)

Deformation and Flexural Properties of Denture Base Polymer Reinforced with Glass Fiber Sheet

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