Correlation in the mechanical properties of acrylic denture base resins

Lee, Hae‐Hyoung; Lee, Chung-Jae; Asaoka, Kenzo

doi:10.4012/dmj.2011-205

Cited by 71 publications

(65 citation statements)

References 29 publications

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“…The flexural strength (FS) and flexural modulus (FM) were calculated using the equations that have appeared in the literature 20) . Work of fracture (WOF, kJ/m 2 ) was calculated by dividing the area under the load-deflection curve by the cross-sectional area of the specimen [31][32][33] .…”

Section: Methodsmentioning

confidence: 99%

“…After light curing under transparent strip, hardness measurements were performed after 20 min post-curing without further polishing. Barcol hardness was measured using the digital Barcol hardness tester (HHP-2001, Bareiss, Oberdischingen, Germany) mounted on a test stand with an electronic display unit 33) . The Barcol hardness number (BH; 0-100) for specimens was averaged from five indentations on each disk (n=6).…”

Section: Methodsmentioning

confidence: 99%

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Investigation of the correlation between the different mechanical properties of resin composites

et al. 2013

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The aim of this study was to investigate the relationship between the different mechanical properties with the filler fraction of various resin composites. Mechanical properties of eighteen different resin composites were investigated in this study; flexural strength (FS), flexural modulus (FM), fracture toughness (FT), compressive strength (CS), diametral tensile strength (DTS), Barcol hardness (BH), Vickers hardness (HV), and Knoop hardness (HK). The mean values of mechanical properties and the filler fractions (V f ) obtained from the literature and the manufacturer were analyzed using Pearson's correlation test at p<0.01. The relationships were compared with the data retrieved from previous studies. Strong correlations between V f and BH/HV/HK and V f and FM were evident in the results of the present study and these results were supported by the retrieved data from previous studies. The other relationships between mechanical properties, such as that between FS and FM and between CS and HV were not significant.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Investigation of the correlation between the different mechanical properties of resin composites

et al. 2013

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“…Mechanical strength of resin is usually evaluated by the three-point bending test, compression test, tensile test, impact test, general hardness test (Vickers, Knoop, Mohs and Brinell), and others 17) ; however, these tests require a large standardized specimen. Therefore, the micro-Vickers hardness test was adopted in this study to evaluate specimens of used dentures with small and rounded surfaces.…”

Section: Hardness Testmentioning

confidence: 99%

Deterioration of polymethyl methacrylate dentures in the oral cavity

Matsuo

Suenaga

Takahashi

et al. 2015

Dental Materials Journal

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Polymethyl methacrylate (PMMA)-made prostheses used in the oral cavity were evaluated by multimodal assessment in order to elucidate the biodeterioration of PMMA. In used dentures (UD), the micro-Vickers hardness of the polished denture surface and denture basal surface was lower than that of the torn surface (p<0.05), whereas the shaved surface approximately 100 µm from the polished surface showed a similar value to the torn surface. By contrast, there were no differences among these surfaces in new resin (NR). The volatile content of UD was higher than that of NR (p<0.05). Component analysis by ATR-FTIR showed specific spectra (1,700-1,400 cm −1 ) only in UD. This study revealed that PMMA deteriorated during long-term use in the oral cavity in terms of hardness and volatile content with component alteration, and suggests the involvement of biodeterioration, possibly due to saliva and oral microbiota.

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“…25 There is a correlation between conversion and polymerization rate of a resin material and micro surface hardness of the material during the polymerization, and it gives information about monomer conversion. 26 Also, mixing conditions of adhesive resin cement polymerization and additional materials in an environment have an effect on polymerization reaction. 27 The present study evaluated the effects of the desensitizers on the contact side of resin cement's hardness during polymerization.…”

Section: Discussionmentioning

confidence: 99%