Evaluation of the level of residual monomer in acrylic denture base materials having different polymerization properties

Kalipçilar, Betül; Karaağaçlioğlu, Lale; Hasanreisoğlu, U

doi:10.1111/j.1365-2842.1991.tb01684.x

Cited by 35 publications

(19 citation statements)

References 5 publications

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“…This technique is a non-destructive method of analysis, which does not modify the specimen. In addition, all procedures are carried out in the liquid at room temperature, thus eliminating heat and yielding more accurate results (Kalipçilar et al, 1991).…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, the reduction of residual monomer content could improve the properties and reduce the cytotoxicity effects of the polymerized acrylic resins, and some post-polymerization treatments have been suggested, such as microwave irradiation and immersion in hot water (Tsuchiya et al, 1994;Yunus et al, 1994;Blagojevic and Murphy, 1999;Machado et al, 2002). Different techniques have been used for the determination of residual monomer in acrylic resins, among them high-performance liquid chromatography (HPLC) (Shim and Watts, 1999;Lassila and Vallittu, 2001;Lee et al, 2002), which has been used to evaluate the level of residual monomer in conventional autopolymerizing and heat-polymerizing acrylic resins polymerized under a variety of methods (Kalipçilar et al, 1991;Lassila and Vallittu, 2001). However, there are no studies in which HPLC was used to determine the residual monomer content in hard chair-side reline resins.…”

Section: Introductionmentioning

confidence: 98%

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Development and application of methods for determination of residual monomer in dental acrylic resins using high performance liquid chromatography

Urban

Cass

Oliveira

et al. 2005

Biomedical Chromatography

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Two high-performance liquid chromatographic methods for determination of residual monomer in dental acrylic resins are described. Monomers were detected by their UV absorbance at 230 nm, on a Nucleosil C18 (5 microm particle size, 100 A pore size, 15 x 0.46 cm i.d.) column. The separation was performed using acetonitrile-water (55:45 v/v) containing 0.01% triethylamine (TEA) for methyl methacrylate and butyl methacrylate, and acetonitrile-water (60:40 v/v) containing 0.01% TEA for isobutyl methacrylate and 1,6-hexanediol dimethacrylate as mobile phases, at a flow rate of 0.8 mL/min. Good linear relationships were obtained in the concentration range 5.0-80.0 microg/mL for methyl methacrylate, 10.0-160.0 microg/mL for butyl methacrylate, 50.0-500.0 microg/mL for isobutyl methacrylate and 2.5-180.0 microg/mL for 1,6-hexanediol dimethacrylate. Adequate assay for intra- and inter-day precision and accuracy was observed during the validation process. An extraction procedure to remove residual monomer from the acrylic resins was also established. Residual monomer was obtained from broken specimens of acrylic disks using methanol as extraction solvent for 2 h in an ice-bath. The developed methods and the extraction procedure were applied to dental acrylic resins, tested with or without post-polymerization treatments, and proved to be accurate and precise for the determination of residual monomer content of the materials evaluated.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Development and application of methods for determination of residual monomer in dental acrylic resins using high performance liquid chromatography

Urban

Cass

Oliveira

et al. 2005

Biomedical Chromatography

View full text Add to dashboard Cite

show abstract

“…Multifunctional monomers used for dental restorations typically exhibit final double bond conversion of 50 to 75% [7-9]. Furthermore, researchers have found at least 6% residual monomer in BisGMA/TEGDMA resin systems after curing [10], which can be heightened by cyclization [11] or lower conversion.…”

Section: Introductionmentioning

confidence: 99%

Investigation of thiol-ene and thiol-ene–methacrylate based resins as dental restorative materials

Cramer¹,

Couch²,

Schreck³

et al. 2010

Dental Materials

117

103

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Objectives-The objective of this work was to evaluate thiol-norbornene and thiol-enemethacrylate systems as the resin phase of dental restorative materials and demonstrate their superior performance as compared to dimethacrylate materials.Methods-Polymerization kinetics and overall functional group conversions were determined by Fourier transform infrared spectroscopy (FTIR). Flexural strength and modulus were determined with a 3-point flexural test. Polymerization-induced shrinkage stress was measured with a tensometer.Results-Thiol-ene polymer systems were demonstrated to exhibit advantageous properties for dental restorative materials in regards to rapid curing kinetics, high conversion, and low shrinkage and stress. However, both the thiol-norbornene and thiol-allyl ether systems studied here exhibit significant reductions in flexural strength and modulus relative to BisGMA/TEGDMA. By utilizing the thiol-ene component as the reactive diluent in dimethacrylate systems, high flexural modulus and strength are achieved while dramatically reducing the polymerization shrinkage stress. The methacrylate-thiol-allyl ether and methacrylate-thiol-norbornene systems both exhibited equivalent flexural modulus (2.1 ± 0.1 GPa) and slightly reduced flexural strength (95 ± 1 and 101 ± 3 MPa, respectively) relative to BisGMA/TEGDMA (flexural modulus; 2.2 + 0.1 GPa and flexural strength; 112 ± 3 MPa). Both the methacrylate-thiol-allyl ether and methacrylate-thiol-norbornene systems exhibited dramatic reductions in shrinkage stress (1.1 ± 0.1 and 1.1 ± 0.2 MPa, respectively) relative to BisGMA/TEGDMA (2.6 ± 0.2 MPa).Significance-The improved polymerization kinetics and overall functional group conversion, coupled with reductions in shrinkage stress while maintaining equivalent flexural modulus, result in a superior overall dental restorative material as compared to traditional bulk dimethacrylate resins.

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“…Water sorption and solubility are closely related to toxicity and dimensional instability, affecting the clinical behavior of acrylic resin (12). According to the results of this study, the solubility and sorption values obtained for all the specimens of groups of different resins, self-cured and heat-polymerized, was below the maximum allowed by the ISO1567 specification (11).…”

Section: Discussionmentioning

confidence: 95%

Influence of peracetic acid at acrylic resin properties

Hehn¹,

Macedo²,

Collares³

et al. 2012

Rev. odonto ciênc.

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Purpose: To evaluate the influence of peracetic acid immersion on water sorption, solubility and microhardness of heat and self-cured acrylic resins.Methods: Thirty specimens of each type of acrylic resin were produced for sorption, solubility and microhardness evaluation. Sorption and solubility were evaluated based on ISO1567. For the microhardness test, specimens (20.0×5.0×10.0 mm) were made and evaluated under a 100 g load for 15 s. The test groups were submitted to a peracetic acid 0.2% immersion for 10 minutes. Data of sorption and solubility were analyzed by two way ANOVA and, hardness values, by paired t-test.Results: Values of sorption and solubility were in agreement with ISO1567 requirements to both groups and ranged, in μg/mm 3 , for sorption from 22.28 (±4.40) to 24.25 (±3.27), and from 1.09 (±0.16) to 1.29 (±0.10) for solubility. Solubility showed a statistically significant difference between the two types of resin at test group. There was no statistical significant difference at the microhardness values.Conclusion: In this study, immersion in peracetic acid solution 0.2% showed no alterations at acrylic resin properties tested.Peracetic acid could be recommended to replace the conventional agents for the disinfection of acrylic resin devices.Key words: Acrylic resin; denture cleanser; prosthodontics ResumoObjetivo: Avaliar a influência da imersão em ácido peracético sobre a sorção, solubilidade e microdureza de resinas acrílicas termo e autopolimerizada.Metodologia: Trinta corpos de prova de cada resina acrílica foram confeccionados para avaliação da sorção, solubilidade e microdureza. A sorção e a solubilidade foram avaliadas de acordo com a ISO 1567. Para a determinação da microdureza, os corpos de prova (20×5×10 mm) foram confeccionados e avaliados com uma carga de 100 g por 15 s. Os grupos teste foram imersos em ácido peracético 0,2% por 10 minutos. Os dados de sorção e solubilidade foram analisados com ANOVA de duas vias e de dureza por teste t pareado.Resultados: Os valores de sorção e solubilidade ficaram de acordo com as especificações da ISO 1567 para ambos os grupos e no ensaio de sorção variaram entre 22,28 (±4,40) até 24,25 (±3,27), e de 1,09 (±0,16) até 1,29 (±0,10) para solubilidade, em μg/mm 3 . A solubilidade apresentou diferença estatisticamente significativa entre os dois tipos de resina após imersão em ácido peracético. Os valores de microdureza não apresentaram diferença estatisticamente significativa entre os grupos.Conclusão: A imersão em ácido peracético 0,2% não alterou as propriedades avaliadas das resinas acrílicas.

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Evaluation of the level of residual monomer in acrylic denture base materials having different polymerization properties

Cited by 35 publications

References 5 publications

Development and application of methods for determination of residual monomer in dental acrylic resins using high performance liquid chromatography

Development and application of methods for determination of residual monomer in dental acrylic resins using high performance liquid chromatography

Investigation of thiol-ene and thiol-ene–methacrylate based resins as dental restorative materials

Influence of peracetic acid at acrylic resin properties

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