Effect of different curing condition on material properties of acrylic resin for orthodontic appliances |
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| Authors: | Cíntia de Vasconcellos Machado Carmen Borges Fortes Fabrício Mezzomo Collares Maria Madalena de Camargo Forte Susana Maria Werner Samuel |
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| Institution: | 1. Department of Dental Materials, School of Dentistry, Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil;2. Department of Conservative Dentistry, School of Dentistry, Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil;3. School of Engineering, Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil;1. Faculty of Life Sciences, University of Manchester, Oxford Road, Manchester M13 9PT, UK;1. Research Group in Congenital & Perinatal Malformations, Dysmorphology and Clinical Genetics (MACOS),Universidad del Valle, Cali, Colombia;2. Departments of Morphology and Obstetrics & Gynecology, Universidad del Valle, Hospital Universitario Del Valle, Cali, Colombia;3. Department of Molecular Biosciences, University of California, Davis School of Veterinary Medicine, Davis, CA, USA;4. MIND Institute, University of California, Davis School of Medicine, Sacramento, CA, USA;5. Medicine and Surgery School, Universidad del Valle, Cali, Colombia;6. Department of Morphology, Universidad del Valle, Cali, Colombia;7. La Misericordia International Clinic, Barranquilla, Colombia;8. Instituto Superior de Estudios Psicológicos, Barcelona, Spain;9. Autonomous University of Barcelona–Sant Joan de Déu Hospital, Barcelona, Spain;10. Department of Biochemistry and Molecular Biology, Pennsylvania State University, University Park, PA 16802, USA;11. Department of Pediatrics and the MIND Institute, University of California, Davis Medical Center, Sacramento, CA, USA;12. Department of Biochemistry and Molecular Medicine, School of Medicine, University of California Davis, Davis, CA, USA;1. Department of Neurology, Mayo Clinic, Rochester, MN, USA;2. Department of Neuropathology, Mayo Clinic, Jacksonville, FL, USA;3. Department of Psychiatry and Psychology, Mayo Clinic, Jacksonville, FL, USA;4. Department of Health Sciences Research, Division of Biostatistics, Rochester, MN, USA;5. Department of Radiology, Mayo Clinic, Rochester, MN, USA;6. Department of Psychiatry and Psychology, Mayo Clinic, Rochester, MN, USA;1. The Key Laboratory of Plant Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, 20 Nanxincun, Xiangshan Road, Beijing 100093, China;2. Natural Product Center, School of Natural Resources and the Environment, The University of Arizona, 250 East Valencia Road, Tucson, AZ 85706, USA |
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| Abstract: | The aim of this study was to evaluate the influence of different curing conditions on degree of conversion, glass transition temperature (Tg), microhardness and impact strength of an autopolymerizing acrylic resin. Twenty-one acrylic resin baseplates with wire clasps simulating removable appliances were produced according to three curing conditions and allocated in three groups (n = 7): Group A—curing in air during 1 h at room temperature and pressure; Group M—treated as in Group A plus additional heating by microwave energy (500 W; 3 min); Group TP—curing in water at 50 °C, during 15 min under 20 psi pressure. Microhardness was measured using a Knoop microhardness indenter, and the degree of conversion and Tg were determined by differential scanning calorimetry (DSC). For impact strength test, 12 non-notched specimens were fabricated per group according to ASTM D256 standard. Data were analyzed statistically by one-way ANOVA and Tukey's test (p < 0.05). Group TP presented the highest microhardness means (p < 0.05), followed by Groups M and A. Group TP showed statistically significant differences on impact strength means (p < 0.05) compared to Groups M and A, which, in turn, did not differ significantly to each other (p > 0.05). No significant differences were found among the Tg values of the three groups (p > 0.05). A better performance may be expected when autopolymerizing acrylic resins are cured under controlled heat and pressure conditions. |
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