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Bonding to ground dentin by a phenyl-P self-etching primer
I Watanabe1, N Nakabayashi, D H Pashley
1Division of Organic Materials, Tokyo Medical and Dental University, Japan.
Journal of Dental Research
|June 1, 1994
Summary
This study found that 20% Phenyl-P in 30% HEMA effectively conditions dentin, enhancing adhesive resin bonding. This single-step system creates a hybrid layer by demineralizing and incorporating the smear layer into the resin.
Area of Science:
- Dental Materials Science
- Biomaterials Engineering
Background:
- Traditional dentin bonding systems often involve multiple steps.
- Smear layers can impede effective adhesion of restorative materials.
Purpose of the Study:
- To evaluate the efficacy of Phenyl-P in 30% HEMA as a single-step dentin conditioner and primer.
- To optimize the concentration of Phenyl-P for maximum bond strength.
Main Methods:
- Investigated varying concentrations of Phenyl-P in 30% HEMA.
- Assessed bond strength using mechanical testing.
- Utilized transmission electron microscopy (TEM) to examine dentin surface and hybrid layer formation.
Main Results:
- Maximum bond strength of 10.4 MPa achieved with 20% Phenyl-P in 30% HEMA.
- TEM revealed partial dissolution of mineral crystals around collagen and smear layer incorporation.
- Formation of a hybrid layer containing the original smear layer was observed.
Conclusions:
- 20% Phenyl-P in 30% HEMA acts as an effective single-step conditioner/primer for dentin.
- This system improves adhesive resin bonding by creating a robust hybrid layer.
- Offers advantages over multi-step bonding systems.