The intent of this grant continuation is to focus on investigating the interface between the resin matrix and the glass filler. X-ray tomography will be used to obtain two-dimensional crack fronts of Dental composite and through image analysis construct three-dimensional representations of the crack surface interface. Also investigated will be the effect of aging in artificial saliva with and without enzymes on the leaching of ions from the glass filler. This will be accomplished using transmission electron microscopy (TEM) with microanalysis. Modeling the micro level stresses and strains in Dental composites will be used to predict the material properties of Dental composites, e.g., fracture toughness, at the macroscopic level. In addition, effects such as environmental loading (in this case artificial saliva and salivary enzymes) and aging (thermal and load cycling) can be modeled at the microscopic level to predict failure patterns of Dental composites under various loading conditions. Finally, a simple chemical model will be prepared and tested by mass spectrometry (MS) to represent the silane coupling agent and its attachment to the resin matrix and the glass filler. This model will also use MS to examine the chemical effect of aging in artificial saliva with and without enzymes. These three Aims are interrelated in that the silane bonding model will be used to help model the microstructure, the ion leaching will be utilized in the micro and chemical model, and the three dimensional crack tomography will be used to validate both models.
The Specific Aims of this grant continuation are: 1) To determine the three-dimensional crack path of Dental composites and human teeth using tomography at the Advanced Photon Source at Argonne National Laboratory and to determine the inorganic leached components from the glass fillers using TEM microanalysis; 2) To model microstructural damage and failure of Dental composites; and 3) To correlate the degradation of resin-silane-bonds in Dental composite materials to their fracture during aging.

Agency
National Institute of Health (NIH)
Institute
National Institute of Dental & Craniofacial Research (NIDCR)
Type
Research Project (R01)
Project #
5R01DE007979-10
Application #
7006985
Study Section
Oral, Dental and Craniofacial Sciences Study Section (ODCS)
Program Officer
Lumelsky, Nadya L
Project Start
1995-09-30
Project End
2008-11-30
Budget Start
2005-12-01
Budget End
2006-11-30
Support Year
10
Fiscal Year
2006
Total Cost
$428,906
Indirect Cost
Name
University of Illinois at Chicago
Department
Dentistry
Type
Schools of Dentistry
DUNS #
098987217
City
Chicago
State
IL
Country
United States
Zip Code
60612
Patki, Amol S; Vural, Murat; Gosz, Mike (2011) Confined compression of dental composites for Class I restorations. J Compos Mater 45:1863-1872
Lin, Lihong; Drummond, James L (2010) Cyclic loading of notched dental composite specimens. Dent Mater 26:207-14
Akhmetov, Artem; Moore, Jerry F; Gasper, Gerald L et al. (2010) Laser desorption postionization for imaging MS of biological material. J Mass Spectrom 45:137-45
Aydin Sevinc, Berdan; Hanley, Luke (2010) Antibacterial activity of dental composites containing zinc oxide nanoparticles. J Biomed Mater Res B Appl Biomater 94:22-31
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Drummond, J L (2008) Degradation, fatigue, and failure of resin dental composite materials. J Dent Res 87:710-9
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Zhou, Manshui; Wu, Chunping; Akhmetov, Artem et al. (2007) 7.87 eV laser desorption postionization mass spectrometry of adsorbed and covalently bound bisphenol A diglycidyl methacrylate. J Am Soc Mass Spectrom 18:1097-108
Al-Turki, Lulwa I; Drummond, James L; Agojci, Majlinda et al. (2007) Contact versus flexure fatigue of a fiber-filled composite. Dent Mater 23:648-53

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