Effects of Postpolymerization Microwave Irradiation on Provisional Dental Acrylics: Physical and Mechanical Properties

Özkömür, Ahmet; Fortes, Carmen Beatriz Borges

doi:10.5301/jabfm.5000279

Cited by 5 publications

(6 citation statements)

References 14 publications

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“…On the other hand, the acrylate double-bond band at 810 cm −1 decreases considerably during the MW treatment: this can be attributed to the reaction between the C=C double-bonds with primary/secondary amines, but also to the thermal contribution related to the microwave radiation which induce bond opening, as already reported in literature, [32,33] and as detailed in Figure S3, Supporting Information. Differences in kinetics were found for the different amine structures, but the trend is identical for all.…”

Section: Microwave-assisted Surface Modificationsupporting

confidence: 75%

A Facile and Green Microwave‐Assisted Strategy to Induce Surface Properties on Complex‐Shape Polymeric 3D Printed Structures

González

Arévalo

Chiappone

et al. 2023

Macro Materials & Eng

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Light‐ induced polymeric 3D printing is becoming a well‐established fabrication method, showing manifold advantages such as control of the local chemistry of the manufactured devices. It can be considered a green technology, since the parts are produced when needed and with minimum amount of materials. In this work 3D printing is combined with another green technology, microwave‐assisted reaction, to fabricate objects of complex geometry with controllable surface properties, exploiting the presence of remaining functional groups on the surface of 3D printed specimens. In this context, surface functionalization with different amines is studied, optimizing formulations, reaction times, and avoiding surface deterioration. Then, two different applications are investigated. MW‐functionalized filter‐type structures have been tested against Staphylococcus aureus bacteria, showing high bactericidal activity on the surface along all areas of the complex‐shaped structure. Second, a fluidic chip composed of three separated channels is 3D printed, filled with different amine‐reactive dyes (dansyl and eosine derivatives), and made to react simultaneously. Complete and independent functionalization of the surface of the three channels is achieved only after 2 min of irradiation. This study demonstrates that light induced 3D printing and microwave‐induced chemistry can be used together effectively, and used to produce functional devices.

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Section: Microwave-assisted Surface Modificationsupporting

confidence: 75%

A Facile and Green Microwave‐Assisted Strategy to Induce Surface Properties on Complex‐Shape Polymeric 3D Printed Structures

González

Arévalo

Chiappone

et al. 2023

Macro Materials & Eng

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“…High degree of MC of provisional restorations may help to ensure adequate physical and mechanical properties for the restorations. 21 Additionally, it was expected that the high conversion could also reduce the risk of unreacted monomer release that may cause cytotoxic effects. 22 It is known that monomer with low glass transition temperature (Tg) and high flexibility could contribute to high degree of MC of the polymer.…”

Section: Degree Of Monomer Conversionmentioning

confidence: 99%

Effects of Different Amine Activators on the Monomer Conversion, Biaxial Flexural Strength, and Color Stability of Experimental Provisional Dental Restorations

et al. 2021

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Objective The aim was to assess the effect of different amine activators including N, N-dimethyl-p-toluidine (DMPT) or Na-N-tolyglycine glycidyl methacrylate (NTGGMA) on chemical-activated monomer conversion, biaxial flexural strength (BFS), and color stability of composites for provisional dental restorations. Materials and Methods Two formulations of composites containing either DMPT (D-temp) or NTGGMA (N-temp) were prepared. The degree of monomer conversion was assessed. The BFS of the materials was tested using the ball-on-ring testing jig. The color difference (∆E00) of the materials after immersion in water was also determined. The commercial comparisons were Unifast (UF), Protemp (PT), Luxacrown, and Luxatemp (LT). Results The monomer conversion of D-temp (57.4 ± 1.3%) was comparable to that of N-temp (59.0 ± 1.3%). The conversion of both D-temp and N-temp were higher than that of PT (48.1 ± 3.4%) and LT (48.0 ± 1.6%). BFS of both D-temp (164.2 ± 18.1 MPa) and N-temp (168.6 ± 8.9 MPa) were comparable but higher than that of UF (119.8 ± 13.6 MPa). ∆E00 of D-temp (2.7 ± 0.7) and N-temp (2.5 ± 0.8) were comparable but higher than that of other commercial materials (0.6–1.2). Conclusion The use of DMPT or NTGGMA showed negligible effect on monomer conversion, BFS, and color stability of the experimental provisional restorations. The conversion and BFS of the experimental materials were in the range of that obtained from commercial bis-acryl-based materials. However, the color stability of the experimental materials was lower than that of commercial materials.

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“…The acrylic resin is available in two main forms as regards to the material polymerization method: heat-cured acrylic resin using hot water or microwave energy and self-cured acrylic resin. During the polymerization, occurs the conversion of the monomer (methyl methacrylate (MMA)) into polymer (polymethyl methacrylate (PMMA)) [ 2 , 6 ]. However, this conversion is not complete, which results in an amount of residual monomer, which can directly affect the structural integrity of the polymer compromising its flexural strength, hardness, and biocompatibility [ 2 , 7 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Thermocycling, Teeth, and Polymerization Methods on Bond Strength Teeth-Denture Base

Freitas

Brandt

Miranda

et al. 2018

International Journal of Dentistry

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Objective To evaluate the shear bond strength between different artificial teeth and denture base polymerized by two polymerization methods submitted to thermocycling. Materials and Methods Two acrylic resins were selected according to the polymerization method (water-bath and microwave), and four different artificial teeth (Biotone, Dentsply; Trilux, Vipi Dent; Premium 8, Heraeus Kulzer; Soluut PX, Yamahachi) were also tested. The polymerization of the acrylic resin was performed by using conventional cycle (8 h at 74°C) in water-bath and using two cycles (20 min at 270 W + 5 min at 360 W) by the microwave method. The shear bond strength was evaluated after 24 h of water storage at 37°C (immediately) and after the thermocycling test (5,000 cycles, 5–55°C). The shear bond strength (n=10) was performed using a universal testing machine (Instron 4411) at a crosshead speed of 1.0 mm/min. Modes of failures were classified as cohesive and adhesive. The data (MPa) were statistically analyzed by three-way ANOVA, and the mean values were compared by the Tukey test (α = 0.05). Results In general, the polymerization by microwave showed the highest shear bond strength values, and Trilux artificial teeth had the lowest bond strength values (p < 0.05). Thermocycling did not affect the shear bond strength (p < 0.05). There was a predominance of cohesive failures for all groups. Conclusions The chemical composition of the artificial teeth affects the bond strength, and the microwave method is preferable to perform the acrylic resin polymerization.

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Effects of Postpolymerization Microwave Irradiation on Provisional Dental Acrylics: Physical and Mechanical Properties

Abstract: It is concluded that mechanical and physical properties are positively influenced by microwave irradiation.

Cited by 5 publications

References 14 publications

A Facile and Green Microwave‐Assisted Strategy to Induce Surface Properties on Complex‐Shape Polymeric 3D Printed Structures

A Facile and Green Microwave‐Assisted Strategy to Induce Surface Properties on Complex‐Shape Polymeric 3D Printed Structures

Effects of Different Amine Activators on the Monomer Conversion, Biaxial Flexural Strength, and Color Stability of Experimental Provisional Dental Restorations

Effect of Thermocycling, Teeth, and Polymerization Methods on Bond Strength Teeth-Denture Base

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