Document Detail

Effect of cross-sectional design on the modulus of elasticity and toughness of fiber-reinforced composite materials.
MedLine Citation:
PMID:  16126074     Owner:  NLM     Status:  MEDLINE    
STATEMENT OF PROBLEM: Many current fabrication protocols for dental fiber-reinforced composites use hand lay-up techniques and technician design input. Little information exists regarding how the manipulation of the cross-sectional design of a prosthesis might affect the modulus of elasticity and toughness. PURPOSE: The aim of this study was to determine the effect of simple and complex cross-sectional designs on the modulus of elasticity and toughness of fiber-reinforced composite used for dental prostheses. MATERIAL AND METHODS: Two particulate composites (BelleGlass HP and Targis) were reinforced with ultra-high-molecular-weight polyethylene fiber ribbon (Connect), woven E-glass fibers (Vectris Frame), or unidirectional R-glass fibers (Vectris Pontic). A range of fiber positions, orientations, or geometries were incorporated into the rhombic specimens (2 x 2 x 25 mm(3)) to achieve simple and complex experimental cross-sectional designs. The control specimen did not contain fiber reinforcement. Specimens (n=6) were stored 1 week in distilled water at 37 degrees C prior to 3-point load testing to determine the modulus of elasticity (GPa) and toughness (MPa). The data within each main fiber group were subjected to 1-way analysis of variance and a Tukey post hoc test (alpha=.05). Cross-sections of randomly selected test specimens (n=2) were made for scanning electron microscope (SEM) analysis of the fiber distribution. RESULTS: The mean modulus of elasticity varied from 8.7 +/- 2.0 GPa (Targis control) to 21.6 +/- 1.4 GPa (2 unidirectional glass fiber reinforcements, 1 each at the tension side and the compression side). Mean toughness varied from 0.07 +/- 0.02 MPa (unidirectional glass fiber positioned at the compression side) as the lowest mean, to 4.53 +/- 0.89 MPa (unidirectional glass fiber positioned at the tension side) as the highest. Significant differences were identified between specimen groups in each main category (all groups P<.001, except modulus of elasticity of the woven E-glass groups, where P=.003). SEM micrographs showed fiber distribution in the cross section of test specimens to correspond with the intended fiber geometry. CONCLUSION: The modulus of elasticity of the composite specimens increased when 1 or more glass fiber groups were located at the compression side of the specimen. Toughness was most effectively increased when 1 or more fiber groups were located at the tension side of the specimen.
Scott R Dyer; Lippo V J Lassila; Mikko Jokinen; Pekka K Vallittu
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  The Journal of prosthetic dentistry     Volume:  94     ISSN:  0022-3913     ISO Abbreviation:  J Prosthet Dent     Publication Date:  2005 Sep 
Date Detail:
Created Date:  2005-08-29     Completed Date:  2005-10-04     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0376364     Medline TA:  J Prosthet Dent     Country:  United States    
Other Details:
Languages:  eng     Pagination:  219-26     Citation Subset:  D; IM    
Department of Restorative Dentistry, Division of Biomaterials and Biomechanics, Oregon Health and Science University, 611 SW Campus Drive, Portland, OR 97239, USA.
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MeSH Terms
Analysis of Variance
Composite Resins / chemistry*
Compressive Strength
Dental Stress Analysis
Glass Ionomer Cements
Materials Testing
Microscopy, Electron, Scanning
Silicate Cement
Tensile Strength
Reg. No./Substance:
0/Composite Resins; 0/Connect resin; 0/Glass Ionomer Cements; 0/Methacrylates; 0/Polyethylenes; 0/belleGlass; 0/dental polyglass; 0/fiberglass; 0/ultra-high molecular weight polyethylene; 1327-39-5/Silicate Cement

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

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