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A clinical scanning electron microscope study of tooth surface preparation and bonding
G P Bloxham1, J D Dennison, G T Charbeneau
1King Saud University, Riyadh, Kingdom of Saudi Arabia.
Australian Dental Journal
|August 1, 1990
Summary
Surface treatments significantly impact dentine bonding. Citric acid and polyacrylic acid effectively removed smear layers, but dentine fluid interfered with Creation Bond System adhesion, unlike Scotchbond on pumiced surfaces.
Area of Science:
- Dental Materials Science
- Biomaterials Engineering
- Adhesive Dentistry
Background:
- The smear layer on dentine, a byproduct of preparation, can impede adhesive bonding.
- Effective removal or modification of the smear layer is crucial for successful dentine bonding systems.
Purpose of the Study:
- To evaluate the influence of different dentine surface treatments on the performance of two dentine bonding systems: Creation Bond System and Scotchbond.
- To investigate the interaction between surface preparation, bonding agents, and dentine fluid under scanning electron microscopy.
Main Methods:
- Cut dentine surfaces were subjected to various treatments: tungsten carbide bur preparation, pumicing, polyacrylic acid etching, and citric acid etching.
- The Creation Bond System and Scotchbond were applied to the treated dentine surfaces.
- Specimens were examined using scanning electron microscopy (SEM) to assess smear layer removal, resin tag formation, and surface interactions.
Main Results:
- Tungsten carbide bur preparation created a smear layer; pumicing retained this layer and plugged tubules.
- Polyacrylic acid and citric acid effectively removed the smear layer.
- Creation Bond System application on polyacrylic acid-treated dentine resulted in hollow depressions.
- Creation Bond System on citric acid-treated dentine showed limited resin tags and hollow depressions, indicating interference from dentine fluid.
- Scotchbond applied to pumiced dentine did not exhibit similar contamination issues.
Conclusions:
- Dentine surface treatment significantly affects the efficacy of dentine bonding systems.
- Dentine fluid can interfere with resin-dentine contact, compromising bond strength, particularly with the Creation Bond System.
- Scotchbond demonstrated better performance on a pumiced surface compared to the Creation Bond System's interaction with acid-etched surfaces in this study.