Document Detail


Nanofiller loading level: Influence on selected properties of an adhesive resin.
MedLine Citation:
PMID:  19203819     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
OBJECTIVES: To evaluate the effect of the filler content in the cohesive strength (sigma), Weibull modulus (m) and degree of conversion (DC) of an experimental adhesive system. METHODS: A HEMA/Bis-GMA/TEGDMA-based adhesive was formulated and filled with silica nanofillers in the following weight percentages (wt%): R0=0%; R1=1%; R3=3%; R5=5% and R10=10%. The adhesive of Adper Scotchbond Multi-Purpose (SBMP) system was used as a commercial reference. Twenty dumbbell-shaped specimens with cross-sectional area of 0.5mm(2) were made per group and tensile tested with a crosshead speed of 0.5mm/min until fracture. The cohesive strength was calculated in MPa. DC was obtained through FTIR after light curing for 25s. Data were submitted to one-way ANOVA and Tukey's test (alpha=0.05) and to Weibull analysis. RESULTS: Mean sigma results were: R0=65.4+/-8.4; R1=73.2+/-8.8; R3=72.0+/-8.4; R5=73.1+/-9.7; R10=85.5+/-13.1 and SBMP=79.0+/-11.0MPa. R10 presented the highest sigma, while R0 showed the lowest. R5 and SBMP did not differ significantly (p<0.05). Weibull analysis revealed no significant difference in structural reliability between groups. The experimental adhesives presented similar results of DC, which, in turn, were significantly higher than the SBMP. CONCLUSIONS: The addition of 10% filler in weight improves the cohesive strength of the adhesive, not interfering in the structural reliability or the degree of conversion.
Authors:
M C M Conde; C H Zanchi; S A Rodrigues-Junior; N L V Carreño; F A Ogliari; E Piva
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Publication Detail:
Type:  Evaluation Studies; Journal Article; Research Support, Non-U.S. Gov't     Date:  2009-02-08
Journal Detail:
Title:  Journal of dentistry     Volume:  37     ISSN:  1879-176X     ISO Abbreviation:  J Dent     Publication Date:  2009 May 
Date Detail:
Created Date:  2009-03-30     Completed Date:  2009-07-07     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0354422     Medline TA:  J Dent     Country:  England    
Other Details:
Languages:  eng     Pagination:  331-5     Citation Subset:  D; IM    
Affiliation:
Biomaterials Development and Control Center, Federal University of Pelotas, RS, Brazil.
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MeSH Terms
Descriptor/Qualifier:
Adhesiveness
Bisphenol A-Glycidyl Methacrylate
Dental Bonding, Light-Cured
Dental Stress Analysis*
Hardness
Materials Testing
Methacrylates
Nanocomposites
Particle Size
Phase Transition
Polyethylene Glycols
Polymethacrylic Acids
Resin Cements* / chemistry
Silicon Dioxide
Spectroscopy, Fourier Transform Infrared
Survival Analysis
Chemical
Reg. No./Substance:
0/Methacrylates; 0/Polyethylene Glycols; 0/Polymethacrylic Acids; 0/Resin Cements; 109-16-0/triethylene glycol dimethacrylate; 1565-94-2/Bisphenol A-Glycidyl Methacrylate; 7631-86-9/Silicon Dioxide; 868-77-9/hydroxyethyl methacrylate

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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