Hardness of denture base and hard chair-side reline acrylic resins

Azevedo, Andrea; Machado, Ana Lúcia; Vergani, Carlos Eduardo; Giampaolo, Eunice Teresinha; Pavarina, Ana Cláudia

doi:10.1590/s1678-77572005000300017

Cited by 40 publications

(32 citation statements)

References 17 publications

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“…Several studies have reported the fracture toughness of denture base resins using the SENB, rather than CT test, because SENB specimens are easier to make 19,21) . The hardness test has been considered as simple and useful method to assess mechanical property for polymeric materials because it is very sensitive of monomer content of dental polymers 23,24) . Also, hardness has been known to correlate with mechanical properties for many metals such as tensile strength 25) .…”

Section: Introductionmentioning

confidence: 99%

Correlation in the mechanical properties of acrylic denture base resins

Lee

Asaoka

2012

Dent. Mater. J.

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The aim of the present study was to measure various mechanical properties of acrylic denture base resins, including flexural modulus, flexural strength, fracture toughness, Barcol and Vickers hardness and their related properties, and to investigate correlations between different mechanical properties. Resin specimens were prepared according to manufacturers' recommended instructions. The mechanical properties were measured under specified standards. Data from the mechanical tests were examined using correlation tests. In general, the mean results for mechanical properties of each specimen group were differently ranked depending on the tested mechanical property. The flexural modulus value showed strong or reasonable positive correlation with those of proportional limit, flexural strength, and surface hardness. In contrast, fracture toughness revealed strong negative correlations with the flexural parameters and hardness values. Results of correlation tests for the different parameters can be used for estimation of mechanical performance of acrylic denture bases in clinical situation and for quality control purposes.

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Section: Introductionmentioning

confidence: 99%

Correlation in the mechanical properties of acrylic denture base resins

Lee

Asaoka

2012

Dent. Mater. J.

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“…The hardness test has been considered a simple and useful method to determine the mechanical properties of polymer-based materials due to its high sensitivity to the amount of monomer in dental polymers (Azevedo et al, 2005). Hardness is important in preventing abrasion and wearing of the PMMA denture base (Consani et al, 2016).…”

Section: Discussionmentioning

confidence: 99%

Effect of Henna Addition on the Surface Roughness and Hardness of Polymethylmethacrylate Denture Base Material: An In-vitro Study

Nawasrah¹,

Gad²,

Zayat³

2017

Preprint

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Statement of problem:Henna has been added to polymethylmethacrylate (PMMA) as a new type of antifungal agent; however, its effect on the latter's physical properties has not been investigated. Purpose:This study aimed to evaluate the effect of the addition of various henna concentrations on the surface roughness and hardness of PMMA denture base material. Materials and Methods:A total of 99 specimens of rectangular-shaped (10×20×3 mm 3 ) acrylic specimens were prepared from heat-cured acrylic resin. Specimens were divided into one control group without the addition of henna and five test groups, which were prepared by adding Yamani henna powder to acrylic powder at concentrations of 1wt%, 2.5wt%, 5wt%, 7.5wt%, and 10wt%. The polymer was added to the monomer before being mixed, packed, and processed using the conventional water bath method. After processing, specimens were finished and polished, then kept in distilled water for 48+2 h. A profilometer and Vickers hardness tester were used to measure surface roughness and hardness respectively. Statistical data analysis was conducted via SPSS version 20.0 (IBM, USA). Results:The addition of henna at varying concentrations significantly increased surface roughness values (P ≤ 0.01) while decreasing hardness (P ≤ 0.0001). The most favorable addition value was 1% henna between all henna groups. Conclusion:The addition of henna to the acrylic resin may negatively affect the surface properties of PMMA acrylic denture base.

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“…Acrylic resin-based materials display differences in their surface hardness levels (Parr & Rueggeberg, 2002;Azevedo et al, 2005;Bindo et al, 2009 andPinto et al, 2010). Denture base surfaces with different hardness levels, in turn, may be influenced differently by mechanical and chemical cleaning procedures.…”

Section: Discussionmentioning

confidence: 99%

Surface Hardness of Acrylic Resins Exposed to Toothbrushing, Chemical Disinfection and Thermocycling

Lira¹,

Leonardo

Consani³

et al. 2014

DENT

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The aim of this study is to investigate the effect of the toothbrushing, chemical disinfection and thermocycling treatments on the surface hardness of acrylic resins used for denture bases. The Classico (conventional), Onda Cryl (microwaved) and QC-20 (boiled) thermoactivated acrylic resins were used to prepare specimens. Prior to and after cleaning procedures, the specimens were submitted to a hardness test in an indenter (HMV-2000 Shimadzu), employing a load of 50 gf for 10 s. Three-way ANOVA and Tukey's test (α=0.05) were used to analyze the data. Prior to thermocycling, statistical differences were found among treatments for Onda Cryl, with greater hardness values observed for Efferdent and hypochlorite; lower hardness value was obtained after toothbrushing, and intermediate value was found for the control. Differences were found among resins for the control treatment, with higher value for QC-20 resin, lower value for the Classico, and intermediate value for the Onda Cryl. Following thermocycling, differences were observed among treatments for Onda Cryl, with control specimens presenting higher values, lower value for toothbrushing and intermediate values for Efferdent and hypochlorite. Differences were also found for QC-20, with Efferdent and hypochlorite presenting higher values, lower value for control and intermediate value for toothbrushing. Differences were found among resins for the control treatment, with higher value for Onda Cryl resin, lower value for the QC-20, and intermediate value for the Classico. The QC-20 resin showed higher value for control prior to thermocycling and Onda Cryl after thermocycling. Different effects on the surface hardness of acrylic resins used for denture bases were observed when associating thermocycling with toothbrushing or chemical disinfections.

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Hardness of denture base and hard chair-side reline acrylic resins

Abstract: In general, the hardness of the materials evaluated increased during dry storage and decreased after immersion in water.

Cited by 40 publications

References 17 publications

Correlation in the mechanical properties of acrylic denture base resins

Correlation in the mechanical properties of acrylic denture base resins

Effect of Henna Addition on the Surface Roughness and Hardness of Polymethylmethacrylate Denture Base Material: An In-vitro Study

Surface Hardness of Acrylic Resins Exposed to Toothbrushing, Chemical Disinfection and Thermocycling

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