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Published on: December 11, 2014
Durability of composite repair using different surface treatments
Thays Regina Ferreira da Costa1, Alexandra Mena Serrano, Allbens Picardi Faria Atman
1School of Dentistry, State University of Ponta Grossa, School of Dentistry, Av. General Carlos Cavalcanti, 4748 Ponta Grossa, Paraná CEP 84030-900, Brazil.
Aluminum oxide sandblasting significantly enhances composite repair strength, likely due to increased surface area. Hydrophobic bonding agents are recommended for durable composite repairs, as hydrophilic agents showed early degradation signs.
Area of Science:
- Dental Materials Science
- Surface Engineering
- Polymer Chemistry
Background:
- Composite resin restorations are prone to wear and fracture, necessitating effective repair strategies.
- Surface treatment of existing composite is crucial for achieving durable repairs.
- The role of bonding agent hydrophilicity in repair strength requires further investigation.
Purpose of the Study:
- To evaluate the impact of different surface treatments and bonding agent hydrophilicity on composite repair strength.
- To assess silver nitrate uptake, surface roughness, and surface area following various treatments.
- To determine the optimal surface preparation for reliable composite repairs.
Main Methods:
- Fifty resin blocks underwent five surface treatments: no treatment, diamond burs (fine, medium, coarse), and aluminum oxide sandblasting.
- Hydrophobic and hydrophilic bonding agents were applied, followed by composite placement.
- Tensile bond strength was tested immediately and after 6 months; silver nitrate uptake, surface roughness, and surface area were also evaluated.
Main Results:
- Aluminum oxide sandblasting yielded the highest composite repair strength for both adhesive types.
- No treatment resulted in the lowest repair strength, regardless of storage time.
- Hydrophilic bonding agents showed early degradation signs after 6 months of water storage.
Conclusions:
- Aluminum oxide sandblasting is the most effective surface treatment for enhancing composite repair strength, likely due to increased surface area.
- While bonding agent hydrophilicity did not significantly affect immediate repair strength, hydrophilic agents showed signs of degradation over time.
- For durable composite repairs, roughening with aluminum oxide followed by a hydrophobic bonding agent is recommended.
