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Effect of dentin surface roughness on shear bond strength.
P M McInnes1, S L Wendt, D H Retief
1Louisiana State University, School of Dentistry, New Orleans.
Summary
Dentin surface roughness, created using various grit sizes of silicon carbide (SiC) and aluminum oxide (Al2O3), did not significantly impact the shear bond strength of dental bonding agents. This finding suggests grit size is not a critical factor for bond strength in this context.
Area of Science:
- Dental Materials Science
- Biomaterials Engineering
- Adhesive Dentistry
Background:
- Dentin surface preparation is crucial for achieving durable adhesive bonds in restorative dentistry.
- Understanding the influence of surface roughness on bond strength is essential for optimizing clinical outcomes.
- Previous research indicates varying effects of surface treatments on dentin- এর bond strength.
Purpose of the Study:
- To investigate the impact of different dentin surface roughness levels on the shear bond strength (SBS) of a specific dentin bonding agent.
- To compare the SBS of dentin prepared with various grit sizes of silicon carbide (SiC) and alternative finishing methods.
Main Methods:
- Seventy-five dentin samples were prepared using five distinct surface treatments, including different grit sizes of SiC and combinations with aluminum oxide (Al2O3) or carbide burs.
- Dentin surfaces were treated with primer and bonding agent, followed by composite resin application and light-curing.
- Shear bond strength was evaluated using a mechanical testing machine, and data were analyzed with Weibull analysis.
Main Results:
- The study found that most grit sizes used for dentin preparation did not significantly affect shear bond strength.
- The group prepared with 600-grit SiC followed by Al2O3 showed a potential, though not definitively significant, difference in bond strength compared to other groups.
- Weibull analysis provided shape factors and characteristic levels for each preparation group, indicating the reliability of the bond strength data.
Conclusions:
- Dentin surface roughness, within the range tested, generally does not significantly influence the shear bond strength of the evaluated dentin bonding agent.
- Clinical protocols for dentin surface preparation may not require stringent control over specific grit sizes for optimal bonding.
- Further research could explore the long-term stability and effects of these surface preparations under different clinical conditions.