Characterization of low-shrinkage dental composites containing methacrylethyl-polyhedral oligomeric silsesquioxane (ME-POSS)
| Autor: | Carlos Eduardo Fellows, Ingrid Kimberly Bezerra dos Santos, Eduardo Moreira da Silva, Talita Angelina Tavares Canellas, Aline de Almeida Neves, Amanda Ramos Pereira de Rezende |
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| Rok vydání: | 2019 |
| Předmět: |
Dental composite
Materials science Surface Properties Diffusion Biomedical Engineering 02 engineering and technology Composite Resins Polymerization Biomaterials 03 medical and health sciences chemistry.chemical_compound 0302 clinical medicine Flexural strength Hardness Materials Testing Organosilicon Compounds Composite material Mechanical Phenomena Shrinkage Aqueous solution Flexural modulus 030206 dentistry 021001 nanoscience & nanotechnology Silsesquioxane Solubility chemistry Mechanics of Materials 0210 nano-technology |
| Zdroj: | Journal of the Mechanical Behavior of Biomedical Materials. 90:566-574 |
| ISSN: | 1751-6161 |
| DOI: | 10.1016/j.jmbbm.2018.10.028 |
| Popis: | The aim of this study was to characterize low-shrinkage dental composites containing methacrylethyl-polyhedral oligomeric silsesquioxane (ME-POSS). Four experimental composites were manufactured, two of which contained organic matrixes of BisGMA-TEGDMA (70/30 wt% - BGC) and BisEMA-TEGDMA (80/20 wt% - BEC). The two other experimental composites replaced BisGMA and BisEMA with 25 wt% of ME-POSS (BGP and BEP). The composites also contained 70 wt% of 0.7 µm silanized BaBSi particles. The following properties were evaluated: Degree of conversion (DC%), volumetric polymerization shrinkage (VS%), polymerization shrinkage stress (Pss), flexural strength (FS), Flexural modulus (FM), hardness (KHN), water sorption (Wsp), water solubility (Wsl), diffusion coefficient (D), and wear. The DC% was not influenced by the presence of ME-POSS, with BEC (75.6%) and BEP (74.8%) presenting higher DC% than BGC (60.6%) and BGP (55.6%). The ME-POSS-containing composites (BGP and BEP) presented significantly lower VS% and Pss. The FS ranged from 92.7 to 142.0 MPa and the FM from 3.6 to 10.3 GPa. ME-POSS did not influence the KHN. BEC and BEP presented lower Wsp and Wsl when compared to BGC and BGP. D ranged from 1.0 × 10−6 to 7.4 × 10−6 cm2 m−1. Incorporation of ME-POSS significantly decreased the wear for both binary matrices (p |
| Databáze: | OpenAIRE |
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