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Interfacial failure of a dental cement composite bonded to glass substrates.

AbstractOBJECTIVES:
To measure the interfacial fracture toughness and investigate failure mechanisms of dental cements bound to soda-lime glasses elastically equivalent to dental ceramics, as loading angle changes from 0 to 20 degrees .
METHODS:
Two half-circle glass discs received surface treatment were bound using dental cement (3M RelyXTM ARC BLBL) to make Brazil-nut sandwich specimens for interfacial toughness testing. Before bonding the two half-circle glass disks, 8% hydrofluoric acid (HF) was applied on the surfaces to bond for 2 min, washed thoroughly for 1 min under tap water and air dried. The surfaces were further treated using silane primer Monobond-s (Vivadent, Liechtenstein) for 60s and air dried. Interfacial toughness as a function of mode mixity was measured using an Instron testing machine by changing loading angels from 0 to 20 degrees . The interfacial fracture surfaces were examined using SEM and EDX to determine the failure modes when loading angles change.
RESULTS:
Interfacial toughness increases from approximately 1 to 8 J/m/m when loading angle increases from 0 to approximately 20 degrees . Increasing deformation and fracture in dental cement occur when loading angle increases.
SIGNIFICANCES:
Increasing interfacial toughness can be attributed to more deformation and fracture of dental cement when loading angle increases. Brazil-nut sandwich samples are shown to provide a promising alternative method to evaluate bond strength and interfacial failure for dental restoration. Research was supported by NIH (NYU/PHS No. F5262-07).
AuthorsJ Zhou, M Huang, F Sagnang, W O Soboyejo
JournalDental materials : official publication of the Academy of Dental Materials (Dent Mater) Vol. 22 Issue 6 Pg. 585-91 (Jun 2006) ISSN: 0109-5641 [Print] England
PMID16229885 (Publication Type: Journal Article, Research Support, N.I.H., Extramural, Research Support, U.S. Gov't, Non-P.H.S.)
Chemical References
  • Calcium Compounds
  • Composite Resins
  • Dental Cements
  • Monobond S
  • Oxides
  • Polymethacrylic Acids
  • RelyX ARC
  • Resin Cements
  • Polyethylene Glycols
  • Bisphenol A-Glycidyl Methacrylate
  • soda lime
  • Sodium Hydroxide
  • Hydrofluoric Acid
Topics
  • Acid Etching, Dental
  • Bisphenol A-Glycidyl Methacrylate (chemistry)
  • Calcium Compounds (chemistry)
  • Ceramics (chemistry)
  • Composite Resins (chemistry)
  • Dental Bonding
  • Dental Cements (chemistry)
  • Dental Stress Analysis (instrumentation)
  • Elasticity
  • Electron Probe Microanalysis
  • Glass (chemistry)
  • Humans
  • Hydrofluoric Acid (chemistry)
  • Materials Testing
  • Microchemistry
  • Microscopy, Electron, Scanning
  • Oxides (chemistry)
  • Polyethylene Glycols (chemistry)
  • Polymethacrylic Acids (chemistry)
  • Resin Cements (chemistry)
  • Sodium Hydroxide (chemistry)
  • Stress, Mechanical
  • Surface Properties

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