| Nano-porous thermally sintered nano silica as novel fillers for dental composites. | |
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MedLine Citation:
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PMID: 22137937 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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OBJECTIVES: The study evaluates properties of an experimental dental composite consisting of a porous thermally sintered nano-silica as filler. The properties are compared with those of an experimental composite containing micro fillers and a commercially available nano-composite, Filtek Supreme(®) Translucent. Different models are used to predict the elastic modulus and strength of the composites. METHODS: Nano-silica with primary particles of 12nm was thermally sintered to form nanoporous filer particles. The experimental composites were prepared by incorporating 70wt.% of the fillers into a mixture of Bis-GMA and TEGDMA as matrix phase. Having added photoinitiator system the composites were inserted into the test molds and light-cured. The microfiller containing composites were also prepared using micron size glass fillers. Degree of conversion (DC%) of the composites was measured using FTIR spectroscopy. Diametral tensile strength (DTS), flexural strength, flexural modulus and fracture toughness were measured. SEM was utilized to study the cross section of the fractured specimens. The surface topography of the specimens was investigated using atomic force microscopy (AFM). The specific surface area of the sintered nano silica was measured using BET method. The data were analyzed and compared by ANOVA and Tukey HSD tests (significance level=0.05). RESULTS: The results showed improvements in flexural modulus and fracture toughness of the composites containing sintered filler. AFM revealed a lower surface roughness for sintered silica containing composites. No significant difference was observed between DTS, DC%, and flexural strength of the sintered nanofiller composite and the Filtek Supreme(®). The results also showed that the modulus of the composite with sintered filler was higher than the model prediction. SIGNIFICANCE: The thermally sintered nano-porous silica fillers significantly enhanced the mechanical properties of dental composites introducing a new approach to develop materials with improved properties. |
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Authors:
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Mohammad Atai; Ayoub Pahlavan; Niloofar Moin |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-12-2 |
Journal Detail:
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Title: Dental materials : official publication of the Academy of Dental Materials Volume: - ISSN: 1879-0097 ISO Abbreviation: - Publication Date: 2011 Dec |
Date Detail:
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Created Date: 2011-12-5 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8508040 Medline TA: Dent Mater Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Copyright Information:
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Copyright © 2011 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved. |
Affiliation:
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Iran Polymer and Petrochemical Institute (IPPI), P.O. Box 14965/115, Tehran, Iran. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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