Rapid curing of acrylic denture-base materials

Jerolimov, Vjekoslav; Brooks, S.C.; Huggett, R; Bates, J.F.

doi:10.1016/0109-5641(89)90086-9

Cited by 46 publications

(44 citation statements)

References 5 publications

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“…[7] Jerolimov et al .,[8] reported that occurrence of porosity is dependent on the concentration of the initiator, generally benzoyl peroxide in the polymer. Depending on the polymerization conditions, 11% porosities have been associated with decreased mechanical properties, poor esthetics, potential harboring of organisms, and retention of fluids.…”

Section: Discussionmentioning

confidence: 99%

Comparative evaluation of surface porosities in conventional heat polymerized acrylic resin cured by water bath and microwave energy with microwavable acrylic resin cured by microwave energy

2013

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Background:Conventional heat cure poly methyl methacrylate (PMMA) is the most commonly used denture base resin despite having some short comings. Lengthy polymerization time being one of them and in order to overcome this fact microwave curing method was recommended. Unavailability of specially designed microwavable acrylic resin made it unpopular. Therefore, in this study, conventional heat cure PMMA was polymerized by microwave energy.Aim and Objectives:This study was designed to evaluate the surface porosities in PMMA cured by conventional water bath and microwave energy and compare it with microwavable acrylic resin cured by microwave energy.Materials and Methods:Wax samples were obtained by pouring molten wax into a metal mold of 25 mm × 12 mm × 3 mm dimensions. These samples were divided into three groups namely C, CM, and M. Group C denotes conventional heat cure PMMA cured by water bath method, CM denotes conventional heat cure PMMA cured by microwave energy, M denotes specially designed microwavable acrylic denture base resin cured by microwave energy. After polymerization, each sample was scanned in three pre-marked areas for surface porosities using the optical microscope. As per the literature available, this instrument is being used for the first time to measure the porosity in acrylic resin. It is a reliable method of measuring area of surface pores. Portion of the sample being scanned is displayed on the computer and with the help of software area of each pore was measured and data were analyzed.Results:Conventional heat cure PMMA samples cured by microwave energy showed maximum porosities than the samples cured by conventional water bath method and microwavable acrylic resin cured by microwave energy. Higher percentage of porosities was statistically significant, but well within the range to be clinically acceptable.Conclusion:Within the limitations of this in-vitro study, conventional heat cure PMMA can be cured by microwave energy without compromising on its property such as surface porosity.

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Section: Discussionmentioning

confidence: 99%

Comparative evaluation of surface porosities in conventional heat polymerized acrylic resin cured by water bath and microwave energy with microwavable acrylic resin cured by microwave energy

2013

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“…Recently, Fourier transform infrared spectrometry (FTIR) has become a popular tool for the analysis of the extent of conversion in dental resins ( Ferracane & Greener, 1984). The literature is replete with conflicting information regarding the varied residual monomer content under different polymerization modes ( Austin & Basker, 1982; Huggett et al ., 1984 ; DeClerck, 1987; Al Doori et al , 1988 ; Truong & Thomasz, 1988; Jerolimov et al ., 1989 ; Harrison & Huggett, 1992; Yunus, Harrison & Huggett, 1994). This investigation used FTIR to compare the residual monomer levels for three materials, each involving a different curing method: Lucitone 199® (conventional long‐cure), Accelar 20® (rapid cure), and Acron MC® (microwave cure).…”

Section: Introductionmentioning

confidence: 99%

Degree of conversion in denture base materials for varied polymerization techniques 1

Bartoloni¹,

Murchison

Wofford³

et al. 2000

J of Oral Rehabilitation

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New processing techniques for denture base acrylic resins have been introduced which have not comparatively quantified the residual monomer content. While proper processing keeps the residual monomer in a tolerable range for most patients, tissue irritation and reaction due to potentially higher residual monomer in these alternative techniques could be a clinical concern. Decreased degree of conversion may influence physical properties as well as biocompatibility. This investigation evaluated the residual monomer content of acrylic resins cured by three different polymerization modes. Materials (polymerization system) evaluated were: Lucitone 199 (conventional process), Accelar 20 (rapid boil-out), and Acron MC (microwave). Fourier transform infrared spectrometry (FTIR) was employed to determine the degree of conversion. All curing methods produced similar results (Lucitone 199 = 92.7% (0.21), Acron MC = 92.6% (0.57), Accelar 20 = 90.9% (0-73). Conversion for Accelar 20 (rapid boil-out technique), though statistically different (P < 0.05, ANOVA) from the other two materials and polymerization techniques, was only slightly less. It is unlikely that the rapid boil-out technique would induce more adverse tissue responses than the other techniques included in this study.

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“…During the polymerization reaction, there is increased monomer activity which is produced by this motion 10. For conventional heat polymerization, concentration of the initiator, generally benzoyl peroxide influences the polymerization rate, in the polymer 11. Polymerization is initially performed at 60℃ to consume all of the free monomer, and then the temperature is increased to approximately 100℃ crosslinking the polymer 12.…”

Section: Introductionmentioning

confidence: 99%

The effect of acrylamide incorporation on the thermal and physical properties of denture resins

2013

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PURPOSEPolymethyl methacrylate (PMMA) is the most commonly used denture base material despite typically low in strength. The purpose of this study was to improve the physical properties of the PMMA based denture base resins (QC-20, Dentsply Ltd., Addlestone, UK; Stellon, AD International Ltd, Dentsply, Switzerland; Acron MC; GC Lab Technologies Inc., Alsip, Japan) by copolymerization mechanism.MATERIALS AND METHODSControl group specimens were prepared according to the manufacturer recommendations. In the copolymer groups; resins were prepared with 5%, 10%, 15% and 20% acrylamide (AAm) (Merck, Hohenbrunn, Germany) content according to the moleculer weight ratio, respectively. Chemical structure was characterized by a Bruker Vertex-70 Fourier transform infrared spectroscopy (FTIR) (Bruker Optics Inc., Ettlingen, Germany). Hardness was determined using an universal hardness tester (Struers Duramin, Struers A/S, Ballerup, Denmark) equipped with a Vickers diamond penetrator. The glass transition temperature (Tg) of control and copolymers were evaluated by Perkin Elmer Diamond DSC (Perkin Elmer, Massachusetts,USA). Statistical analyses were carried out using the statistical package SPSS for Windows, version 15.0 (SPSS, Chicago, IL, USA). The results were tested regarding the normality of distribution with the Shapiro Wilk test. Data were analyzed using ANOVA with post-hoc Tukey test (P<.01).RESULTSThe copolymer synthesis was confirmed by FTIR spectroscopy. Glass transition temperature of the copolymer groups were higher than the control groups of the resins. The 10%, 15% and 20% copolymer groups of Stellon presented significantly higher than the control group in terms of hardness. 15% and 20% copolymer groups of Acron MC showed significantly higher hardness values when compared to the control group of the resin. Acrylamide addition did not affect the hardness of the QC-20 resin significantly.CONCLUSIONWithin the limitation of this study, it can be concluded that copolymerization of PMMA with AAm increased the hardness value and glass transition temperature of PMMA denture base resins.

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Rapid curing of acrylic denture-base materials

Cited by 46 publications

References 5 publications

Comparative evaluation of surface porosities in conventional heat polymerized acrylic resin cured by water bath and microwave energy with microwavable acrylic resin cured by microwave energy

Comparative evaluation of surface porosities in conventional heat polymerized acrylic resin cured by water bath and microwave energy with microwavable acrylic resin cured by microwave energy

Degree of conversion in denture base materials for varied polymerization techniques 1

The effect of acrylamide incorporation on the thermal and physical properties of denture resins

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