Properties of a New Nanofiber Restorative Composite
Autor: | John Brewster, E M Yancey, C S Nuttall, Kraig S. Vandewalle, Wen Lien, Howard W. Roberts |
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Rok vydání: | 2018 |
Předmět: |
Materials science
Surface Properties 0206 medical engineering Composite number Nanofibers Modulus 02 engineering and technology medicine.disease_cause Composite Resins Polymerization 03 medical and health sciences 0302 clinical medicine Flexural strength Mold Elastic Modulus Flexural Strength Materials Testing medicine Composite material General Dentistry Elastic modulus Shrinkage Light-Curing of Dental Adhesives Universal testing machine Flexural modulus 030206 dentistry 020601 biomedical engineering Microscopy Electron Scanning |
Zdroj: | Operative dentistry. 44(1) |
ISSN: | 1559-2863 |
Popis: | SUMMARY A new nanofiber-reinforced hybrid composite (NovaPro Fill, Nanova) was recently introduced with reportedly improved mechanical properties. The purpose of this study was to compare the properties (flexural strength/modulus, degree of conversion [DC], depth of cure, and polymerization shrinkage) of the nanofiber composite to those of traditional hybrid composites (Filtek Z250, 3M ESPE; Esthet-X HD, Dentsply). To determine flexural strength and modulus, composite was placed in a rectangular mold, light-cured, stored for 24 hours, and then fractured in a universal testing machine. For degree of conversion, composite was placed in a cylindrical mold, light-cured, and stored for 24 hours. Measurements were made at the top and bottom surfaces using Fourier Transform Infrared Spectroscopy. To determine depth of cure, composite was placed in a cylindrical mold and light-cured. Uncured composite was scraped until polymerized resin was reached. Remaining composite was measured and divided by two. Polymerization shrinkage was determined by placing the composite material on a pedestal in a video-imaging device while light-curing. Shrinkage was determined after 10 minutes. Data were analyzed with one-way analysis of variance and Tukey post hoc test per property (α=0.05). Compared to Filtek Z250, NovaPro Fill had significantly lower flexural strength and modulus, greater volumetric shrinkage, and similar depth of cure, but greater top and bottom DC. Compared to Esthet-X HD, NovaPro Fill had similar flexural strength, shrinkage, and top and bottom DC, but significantly greater depth of cure and flexural modulus. |
Databáze: | OpenAIRE |
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