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Influence of High-Pressure Polymerization on Mechanical Properties of Denture Base Resins.
- Source :
-
Journal of prosthodontics : official journal of the American College of Prosthodontists [J Prosthodont] 2021 Feb; Vol. 30 (2), pp. 128-134. Date of Electronic Publication: 2020 Sep 06. - Publication Year :
- 2021
-
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.<br />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 <subscript>f</subscript> ), elastic modulus (E <subscript>f</subscript> ), hardness, density (ρ), flexural deformation at maximal flexural stress, flexural load energy (U <subscript>r</subscript> ) and viscoelastic properties (E', E'', Tanδ, T <subscript>g</subscript> ) were analyzed using one-way ANOVA (α = 0.05), Scheffé multiple means comparisons (α = 0.05) and Weibull statistics (for σ <subscript>f</subscript> ). SEM images of the fractured surfaces were obtained.<br />Results: E <subscript>f</subscript> , E', E'' and density of HP polymerized Probase hot were significantly higher than conventional heat polymerized Probase Hot, whereas T <subscript>g</subscript> was significantly lower and σ <subscript>f</subscript> , Tanδ, hardness, flexural deformation at maximal flexural stress, U <subscript>r</subscript> were not significantly different. The highest values for σ <subscript>f</subscript> , flexural deformation at maximal flexural stress, U <subscript>r</subscript> and Weibull modulus were obtained with Ivobase CAD.<br />Conclusion: HP polymerization does not significantly increase the mechanical properties of denture base resins.<br /> (© 2020 by the American College of Prosthodontists.)
Details
- Language :
- English
- ISSN :
- 1532-849X
- Volume :
- 30
- Issue :
- 2
- Database :
- MEDLINE
- Journal :
- Journal of prosthodontics : official journal of the American College of Prosthodontists
- Publication Type :
- Academic Journal
- Accession number :
- 32744368
- Full Text :
- https://doi.org/10.1111/jopr.13231