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Journal of Dental Research
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Biomaterials & Bioengineering

In vitro Performance of Nano-heterogeneous Dentin Adhesive

Q. Ye1, J.G. Park1, E. Topp2, Y. Wang3, A. Misra1,4 and P. Spencer1,5,*

1 Bioengineering Research Center, University of Kansas, 1530 W. 15th Street, Lawrence, KS 66045, USA;
2 Department of Pharmaceutical Chemistry, University of Kansas, Lawrence, KS;
3 University of Missouri-Kansas City, School of Dentistry, Kansas City, MO;
4 Department of Civil Engineering, University of Kansas, Lawrence, KS; and
5 Department of Mechanical Engineering, University of Kansas, Lawrence, KS

Correspondence: * corresponding author, pspencer{at}ku.edu

Water is ubiquitous in the mouths of healthy individuals and routinely interferes with efforts to bond restorations to dental tissues. Our previous studies using tapping-mode atomic force microscopy (TMAFM) have shown that nanophase separation is a general feature of cross-linked polymethacrylates photocured in the presence of water. To explore the relationship between nanophase separation in dentin adhesives and their long-term mechanical properties, we evaluated model adhesives after 3 months of aqueous storage. The degree of contrast in the TMAFM phase image depended on the formulations used, ranging from ‘not observable’ to ‘very strong’. Correspondingly, the mechanical properties of these model adhesives varied from ‘minimal change’ to ‘significant depreciation’. The results support the hypothesis that a high degree of heterogeneity at the nano-scale is associated with poor mechanical durability in these model adhesives.

Key Words: dentin adhesive • durability • degree of nano-heterogeneity • phase contrast • aqueous storage

Journal of Dental Research, Vol. 87, No. 9, 829-833 (2008)
DOI: 10.1177/154405910808700911
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