Flexural strength of acrylic resin repairs processed by different methods: water bath, microwave energy and chemical polymerization

Filho, João Neudenir Arioli; Butignon, Luís Eduardo; Pereira, Rodrigo de Paula; Lucas, Matheus Guilherme; Mollo, Francisco de Assis

doi:10.1590/s1678-77572011000300013

Cited by 23 publications

(15 citation statements)

References 26 publications

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“…Moreover, the patient spends less time without a denture during the repair process. 17 Unfortunately, the low surface properties and porosity of cold-cured repair resin increase the susceptibility to Candida adhesion. 18 Şahin et al tested the effect of heat-polymerized, cold-cured, microwave-cured, and light-cured repair materials for flexural strength and Candida adhesion, and they found that the repair materials were highly susceptible to C. albicans adhesion.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, various studies have investigated the effect of reinforcement materials and surface treatment on the physical properties of repaired dentures. 17,21 Some applications of cold-cured acrylic resin include interim removable prostheses, maxillofacial prostheses, orthodontic removable appliances, and implant-supported fixed interim prostheses. 16,17,21,24 All prosthetic replacements must be carefully designed, properly executed, meticulously cleaned, and preserved during the intended service time of the temporary restoration.…”

Section: Introductionmentioning

confidence: 99%

“…17,21 Some applications of cold-cured acrylic resin include interim removable prostheses, maxillofacial prostheses, orthodontic removable appliances, and implant-supported fixed interim prostheses. 16,17,21,24 All prosthetic replacements must be carefully designed, properly executed, meticulously cleaned, and preserved during the intended service time of the temporary restoration. 25 The interim removable prosthesis is a prosthesis designed to enhance esthetics, stabilization, and/or function for a limited period of time, which can be replaced later by a definite prosthesis.…”

Section: Introductionmentioning

confidence: 99%

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Inhibitory effect of zirconium oxide nanoparticles on <em>Candida albicans</em> adhesion to repaired polymethyl methacrylate denture bases and interim removable prostheses: a new approach for denture stomatitis prevention

Gad¹,

Al‐Thobity²,

Shahin³

et al. 2017

IJN

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Background Despite drawbacks, cold-cured acrylic resin is still the most common material used in denture repair. Zirconia nanoparticles were among the reinforcements added to increase the strength of the resin. The effect on Candida due to the addition of zirconia nanoparticles to the resin has not been investigated. Purpose The aim of this study was to evaluate the effect of zirconia nanoparticles added to cold-cured acrylic resin on Candida albicans adhesion. Materials and methods A total of 120 acrylic resin specimens with dimensions measuring 22×10×2.5 mm 3 were prepared and divided into two equal groups. One group (repair) comprised heat-polymerized specimens that were sectioned at the center and prepared to create a 2 mm repair area that was repaired with cold-cured resin reinforced with 0% wt, 2.5% wt, 5% wt, and 7.5% wt zirconia nanoparticles. The second group contained intact cold-cured acrylic resin specimens reinforced with 0% wt, 2.5% wt, 5% wt, and 7.5% wt zirconia nanoparticles. Specimens were incubated at 37°C in artificial saliva containing C. albicans , and the effect of zirconia nanoparticles on C. albicans was assessed using two methods: 1) a slide count method and 2) a direct culture test. Variations in the number of living Candida were observed in relation to the different concentrations of zirconia nanoparticles. Analysis of variance (ANOVA) and post hoc Tukey’s tests were performed for data analysis. If the P -value was ≤0.05, then the difference was considered as statistically significant. Results It was found that C. albicans adhesion to repaired specimens was significantly decreased by the addition of zirconia nanoparticles ( P <0.00001) in comparison with the control group. Intact cold-cured groups and groups repaired with cold-cured resin reinforced with 7.5% wt zirconia nanoparticles showed the lowest Candida count. Tukey’s test showed a significant difference between the repaired group and the intact cold-cured group, while the later demonstrated a lower Candida count. Conclusion The addition of zirconia nanoparticles to cold-cured acrylic resin is an effective method for reducing Candida adhesion to repaired polymethyl methacrylate (PMMA) denture bases and cold-cured removable prosthesis. Clinical significance Based on the results of the current study, zirconia nanoparticles have an antifungal effect, which could be incorporated in the repair material for repairing denture bases and in PMMA removable prostheses as a possible approach for denture stomatitis prevention.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Inhibitory effect of zirconium oxide nanoparticles on <em>Candida albicans</em> adhesion to repaired polymethyl methacrylate denture bases and interim removable prostheses: a new approach for denture stomatitis prevention

Gad¹,

Al‐Thobity²,

Shahin³

et al. 2017

IJN

View full text Add to dashboard Cite

show abstract

“…Denture repair depends on many variables including material type, material reinforcement, surface design, and surface treatment [ 2 ]. Several materials have been used to repair fractured denture bases, including autopolymerized, visible light polymerized, heat polymerized, or microwave polymerized acrylic resin [ 4 , 5 ]. Most (86%) of denture base repairs are made with autopolymerized acrylic resin [ 6 ] because it is easy to manipulate and fast and can be used chair-side [ 7 ].…”

Section: Introductionmentioning

confidence: 99%

The Reinforcement Effect of Nano-Zirconia on the Transverse Strength of Repaired Acrylic Denture Base

Gad

ArRejaie

Abdel-Halim

et al. 2016

International Journal of Dentistry

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Objective. The aim of this study was to evaluate the effect of incorporation of glass fiber, zirconia, and nano-zirconia on the transverse strength of repaired denture base. Materials and Methods. Eighty specimens of heat polymerized acrylic resin were prepared and randomly divided into eight groups (n = 10): one intact group (control) and seven repaired groups. One group was repaired with autopolymerized resin while the other six groups were repaired using autopolymerized resin reinforced with 2 wt% or 5 wt% glass fiber, zirconia, or nano-zirconia particles. A three-point bending test was used to measure the transverse strength. The results were analyzed using SPSS and repeated measure ANOVA and post hoc least significance (LSD) test (P ≤ 0.05). Results. Among repaired groups it was found that autopolymerized resin reinforced with 2 or 5 wt% nano-zirconia showed the highest transverse strength (P ≤ 0.05). Repairs with autopolymerized acrylic resin reinforced with 5 wt% zirconia showed the lowest transverse strength value. There was no significant difference between the groups repaired with repair resin without reinforcement, 2 wt% zirconia, and glass fiber reinforced resin. Conclusion. Reinforcing of repair material with nano-zirconia may significantly improve the transverse strength of some fractured denture base polymers.

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“…However, laboratory packing and flasking procedures for heat polymerized resins are time-consuming and present risk of denture deformation by heat. [ 3 ]…”

Section: Introductionmentioning

confidence: 99%

A comparative evaluation of effect of reinforced autopolymerizing resin on the flexural strength of repaired heat-polymerized denture base resin before and after thermocycling

Kumar¹,

Kumar²,

Sehgal³

et al. 2017

J Int Soc Prevent Communit Dent

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Aims and Objective:Denture fractures are a common problem in clinical practice. Despite the use of different reinforcement materials (metal wires, metal plates, and various types of fibers) for denture repairs, recurrent fractures are still common. The purpose of this study was to compare the maximum flexural loads of the heat-polymerized denture base resin when repaired with autopolymerizing resin reinforced with relatively smaller diameter metal wires and glass fibers, before and after thermocycling.Materials and Methods:Heat polymerized rectangular specimens were fabricated and repaired with autopolymerized resin and different reinforcement materials. Stainless steel wires, coaxial wires, beta-titanium wires, and glass fibers were used as reinforcement materials. Metal wires were sandblasted before placing in the center of the specimen along with autopolymerizing resin. Control specimens were repaired without any reinforcements. Intact heat- and self-cure specimens were also prepared for comparison. Half of the specimens of each group were subjected to thermocycle stressing (5°C and 55°C, 30 s dwell time) for 2000 cycles. All the specimens, nonthermocycled as well as thermocycled, were then tested for flexural strength by using 3 point flexural test in Lloyd's Universal testing machine at 5 mm/min crosshead speed. The maximum flexural loads (N) for each specimen were recorded. The readings, thus obtained, were subjected to statistical analysis using two-way ANOVA and Tukey's multiple comparison test.Results:The metal wire reinforcements increased the flexural strength of repaired specimens, whereas, glass fiber reinforcement produced slightly lower flexural strength when compared to those of control specimens, i.e., repair without any reinforcement. The highest flexural strength was demonstrated by specimens repaired with coaxial wire reinforcements (50.01 and 43.77 N before and after thermocycling, respectively). The increase in flexural strength with the use of stainless steel wire (45.12 and 41.56 N) and beta-titanium wire reinforcements (45.54 and 42.61N) was insignificant.Conclusions:Coaxial wire reinforcement produced significantly higher flexural loads than control. Increase in strength with stainless steel wire and beta-titanium wire was insignificant, whereas glass fiber reinforcement reduced the strength.

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Flexural strength of acrylic resin repairs processed by different methods: water bath, microwave energy and chemical polymerization

Cited by 23 publications

References 26 publications

Inhibitory effect of zirconium oxide nanoparticles on <em>Candida albicans</em> adhesion to repaired polymethyl methacrylate denture bases and interim removable prostheses: a new approach for denture stomatitis prevention

Inhibitory effect of zirconium oxide nanoparticles on <em>Candida albicans</em> adhesion to repaired polymethyl methacrylate denture bases and interim removable prostheses: a new approach for denture stomatitis prevention

The Reinforcement Effect of Nano-Zirconia on the Transverse Strength of Repaired Acrylic Denture Base

A comparative evaluation of effect of reinforced autopolymerizing resin on the flexural strength of repaired heat-polymerized denture base resin before and after thermocycling

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