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Mechanical stability of resin-dentin bond components
Marcela Rocha de Oliveira Carrilho1, Franklin R Tay, David H Pashley
1Department of Restorative Dentistry, Dental Materials, Piracicaba School of Dentistry, University of Campinas, Piracicaba, SP, Brazil.
Summary
Long-term storage in water or oil significantly degrades the mechanical properties of resin composites and adhesive systems. Mineralized dentin remains unaffected, while demineralized dentin shows reduced properties when stored in oil.
Area of Science:
- Dental Materials Science
- Biomaterials Engineering
- Polymer Science
Background:
- Resin-dentin bonds are crucial for dental restorations.
- Understanding the long-term stability of these bonds is essential for clinical success.
- Mechanical properties of bond components can be affected by storage conditions.
Purpose of the Study:
- To assess the impact of long-term storage on the mechanical properties of resin composites, adhesive systems, and dentin substrates.
- To compare the effects of storage in distilled water versus mineral oil.
- To evaluate the durability of resin-dentin bond components over 12 months.
Main Methods:
- Resin composite and adhesive system specimens were prepared and stored at 37°C in distilled water or mineral oil for 12 months.
- Dentin specimens (mineralized and demineralized) were subjected to similar storage conditions.
- Tensile testing was performed to determine true stress (TS) and apparent modulus of elasticity (E).
- Statistical analysis included ANOVA and Tukey's test.
Main Results:
- Significant decreases in TS and E were observed for resin-based materials after 12 months in water, except for the TS of the Single Bond (SB) adhesive.
- Mineralized dentin showed no significant changes in mechanical properties regardless of storage.
- Demineralized dentin stored in water exhibited no significant changes, but storage in oil led to significant reductions in TS and E.
Conclusions:
- Storage duration and medium can negatively impact the mechanical integrity of resin-dentin bond components.
- These changes may compromise the long-term clinical performance and durability of dental restorations.
- Specific storage conditions, particularly oil, can be detrimental to demineralized dentin properties.