AI Article Synopsis
- - The study examined how high-pressure polymerization affects the mechanical properties of PMMA resins used in dentures, comparing it to conventional methods and digital denture materials.
- - Three types of PMMA blocks were tested for various mechanical and physical properties using statistical analysis to identify significant differences among them.
- - Results showed that while high-pressure polymerization improved certain properties like elastic modulus and density, it did not significantly enhance the overall mechanical properties compared to conventional methods.
Article Abstract
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 thermopolymerization 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 (σ ), elastic modulus (E ), hardness, density (ρ), flexural deformation at maximal flexural stress, flexural load energy (U ) and viscoelastic properties (E', E'', Tanδ, T ) were analyzed using one-way ANOVA (α = 0.05), Scheffé multiple means comparisons (α = 0.05) and Weibull statistics (for σ ). SEM images of the fractured surfaces were obtained.
Results: E , E', E'' and density of HP polymerized Probase hot were significantly higher than conventional heat polymerized Probase Hot, whereas T was significantly lower and σ , Tanδ, hardness, flexural deformation at maximal flexural stress, U were not significantly different. The highest values for σ , flexural deformation at maximal flexural stress, U and Weibull modulus were obtained with Ivobase CAD.
Conclusion: HP polymerization does not significantly increase the mechanical properties of denture base resins.
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| http://dx.doi.org/10.1111/jopr.13231 | DOI Listing |
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