Influence of High-Pressure Polymerization on Mechanical Properties of Denture Base Resins
| Autor: | Jean-François Nguyen, O Hüe, Amélie Mainjot, Michaël Sadoun, José Becerra |
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| Rok vydání: | 2020 |
| Předmět: |
Denture Bases
Materials science Weibull modulus Surface Properties 0206 medical engineering 030206 dentistry 02 engineering and technology 020601 biomedical engineering Viscoelasticity Polymerization 03 medical and health sciences 0302 clinical medicine Flexural strength Hardness High pressure Elastic Modulus Materials Testing Denture base Polymethyl Methacrylate Deformation (engineering) Composite material Pliability General Dentistry Elastic modulus |
| Zdroj: | Journal of prosthodontics : official journal of the American College of ProsthodontistsReferences. 30(2) |
| ISSN: | 1532-849X |
| Popis: | Purpose The purpose of this study was to study the influence of high-pressure (HP) polymerization on the mechanical properties of denture base PMMA resins compared with conventional thermo- polymerization and PMMA discs for digital dentures. Materials and methods Three groups of blocks were prepared: Probase Hot (Ivoclar Vivadent, Lichtenstein) conventionally heat polymerized at 100°C, Probase Hot heat polymerized at 100°C under HP (200 MPa) and Ivobase CAD (Ivoclar Vivadent, Lichtenstein). Samples for mechanical/physical (n = 30) and samples for viscoelastic (n = 10) characterizations were cut from the blocks. Flexural strength (σf ), elastic modulus (Ef ), hardness, density (ρ), flexural deformation at maximal flexural stress, flexural load energy (Ur ) and viscoelastic properties (E', E'', Tanδ, Tg ) were analyzed using one-way ANOVA (α = 0.05), Scheffe multiple means comparisons (α = 0.05) and Weibull statistics (for σf ). SEM images of the fractured surfaces were obtained. Results Ef , E', E'' and density of HP polymerized Probase hot were significantly higher than conventional heat polymerized Probase Hot, whereas Tg was significantly lower and σf , Tanδ, hardness, flexural deformation at maximal flexural stress, Ur were not significantly different. The highest values for σf , flexural deformation at maximal flexural stress, Ur and Weibull modulus were obtained with Ivobase CAD. Conclusion HP polymerization does not significantly increase the mechanical properties of denture base resins. This article is protected by copyright. All rights reserved. |
| Databáze: | OpenAIRE |
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