Mechanical properties of visible light-cured resins reinforced with hydroxyapatite for dental restoration
| Autor: | Concepción Domingo Pascual, Manuel Toledano, A. López-Macipe, Maria Alejandra Fanovich, Jaime Murtra, Raul W Arcı́s, Estrella Osorio, Rafael Rodríguez-Clemente |
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| Rok vydání: | 2001 |
| Předmět: |
Dental composite
Materials science Light Surface Properties medicine.medical_treatment Statistics as Topic Malates Methacrylate Mechanics Composite Resins Citric Acid Polyethylene Glycols chemistry.chemical_compound Dental Materials Flexural strength Polymethacrylic Acids Hardness Adhesives Materials Testing medicine Humans General Materials Science Bisphenol A-Glycidyl Methacrylate Composite material Dental Restoration Permanent Pliability General Dentistry Analysis of Variance Elasticity Durapatite Methacrylic acid chemistry Acrylates Mechanics of Materials Vickers hardness test Microscopy Electron Scanning Surface modification Methacrylates Dental restoration |
| Zdroj: | Dental materials : official publication of the Academy of Dental Materials. 18(1) |
| ISSN: | 0109-5641 |
| Popis: | Objectives: The purpose of this study was to measure and analyze the mechanical properties of several composite materials designed for dental restoration. Methods: The materials were composed of a visible light-curing monomer mixture (either Bis-GMA+TEGDMA or Bis-GMA+HEMA) as a matrix and hydroxyapatite (either microscopic or nanoscopic particles) as a reinforcing filler. The surface of the hydroxyapatite particles was modified by using a coupling agent (citric, malic, acrylic or methacrylic acid). Five specimens of 14 different composites were prepared for each mechanical test: flexural strength, Young's modulus and Vickers hardness. Mean values and standard deviations were calculated, and ANOVA and Student Newman Keuls multiple comparison tests were applied (P Results: The addition of 50–60 wt% of hydroxyapatite particles to the unfilled monomer mixtures led to the increase of both Young's modulus and surface hardness of the material, while the flexural strength decreased. In general, when microscopic instead of nanoscopic hydroxyapatite was used as a reinforcing filler, mechanical properties were favored. The mechanical properties were also improved by adding citric, acrylic or methacrylic acid as a coupling agent. Conclusions: An adequate surface modification of the hydroxyapatite particles conferred enhanced mechanical properties to the final dental composite. Microscopic-hydroxyapatite particles are preferred to nanoscopic ones. |
| Databáze: | OpenAIRE |
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