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Microtensile dentin adhesive bond strength under different positive pulpal pressures
John H Purk1, Vladimir Dusevich, Jared Atwood
1Department of Restorative Dentistry, School of Dentistry, University of Missouri-Kansas City, 650 East 25th Street, Kansas City, Missouri 64108, USA. purkj@umkc.edu
American Journal of Dentistry
|February 25, 2010
Summary
Clearfil-SE demonstrated superior dentin microtensile bond strength under hydrostatic pulpal pressure compared to other tested adhesives. Bond strength decreased with increasing water pressure for most adhesives, except Clearfil-SE at higher pressures.
Area of Science:
- Dental Materials Science
- Adhesive Dentistry
- Biomaterials Engineering
Background:
- Hydrostatic pulpal pressure can affect the integrity of dental restorations.
- Understanding adhesive performance under varying pressures is crucial for clinical success.
Purpose of the Study:
- To evaluate the in vitro dentin microtensile bond strength of four established dental adhesives.
- To assess the influence of different hydrostatic pulpal pressures (0.0, 5.0, and 15.0 cm water) on bond strength.
Main Methods:
- Four adhesives (Clearfil-SE, One-Step Plus, Peak-SE, PQ1) were tested on human molars.
- Teeth were subjected to three hydrostatic water pressure levels during restoration.
- Microtensile bond strength was measured after 24 hours, and failure modes were analyzed.
Main Results:
- A significant interaction was found between adhesive type and water pressure (P < 0.001).
- Clearfil-SE exhibited higher bond strength than other adhesives at 5.0 and 15.0 cm water pressure.
- Bond strength generally decreased with increased water pressure for One-Step Plus, Peak-SE, and PQ1.
Conclusions:
- Clearfil-SE shows promising bond strength under hydrostatic pulpal pressure.
- Clinical application of adhesives may be influenced by intra-pulpal pressure.
- Further research is needed to optimize adhesive strategies for varying physiological conditions.
