The occurrence of porosity in reline acrylic resins. Effect of microwave disinfection
| Autor: | Polyanna Maria Rocha Novais, Carlos Eduardo Vergani, Ana Lucia Machado, Eunice Teresinha Giampaolo, Ana Cláudia Pavarina, Janaina Habib Jorge |
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| Rok vydání: | 2009 |
| Předmět: |
Denture Bases
Time Factors Surface Properties Scanning electron microscope Acrylic Resins Dental Materials Sem micrographs Materials Testing Denture Rebasing Image Processing Computer-Assisted Humans Medicine Composite material Microwaves Porosity General Dentistry Acrylic resin business.industry Temperature Water Disinfection Microwave heating visual_art Microscopy Electron Scanning Silicone Elastomers visual_art.visual_art_medium Methacrylates Denture base Geriatrics and Gerontology business Microwave |
| Zdroj: | Gerodontology. 26:65-71 |
| ISSN: | 1741-2358 0734-0664 |
| Popis: | Background: Microwave energy has proved to be an effective method for disinfecting acrylic dentures. However, the effect of microwave heating on the porosity of autopolymerising denture reline resins has not been investigated. Objective: The purpose of the study was to determine the effect of microwave disinfection on the porosity of autopolymerised denture reline materials (Kooliner-K, New Truliner-NT, Tokuso Rebase Fast-TR and Ufi Gel Hard-UGH) and a conventional heat-polymerised denture base resin (Lucitone 550-L). Material and methods: Specimens (10 mm × 20 mm × 1 mm) were obtained from the impression surface of the palatal mucosa in a single person and divided into four groups (n = 5). The porosity was evaluated after polymerisation (C1), after two cycles of microwave disinfection (MW2), after seven cycles of microwave disinfection (MW7) and after 7 days storage in water at 37°C (C2). Specimens from group MW7 were exposed to microwave disinfection daily being stored in water at 37°C between exposures. All the replicas were sputter coated with gold and micrographs/digital images were taken of each replica using scanning electron microscopy at magnification × 100. The SEM micrographs were then examined using an image analyser to determine the number of pores. Comparison between materials and groups were made using Kruskal–Wallis tests. Results: MW7 resulted in a significant increase in the number from the pores of material K, but decreased in number in reline material TR and UGH reline resin. The number of pores in materials NT and L remained unaffected following microwave disinfection. Conclusion: Differences in the porosity amongst the materials and for different experimental conditions were observed following microwave disinfection. |
| Databáze: | OpenAIRE |
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