Abstract | OBJECTIVES: 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).
|
Authors | J Zhou, M Huang, F Sagnang, W O Soboyejo |
Journal | Dental 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 |
PMID | 16229885
(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
|