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Resin composite adhesion to dentin using different curing lights and adhesive systems applied under electric current.
Carolina Menezes Maciel1, Marcelo Ferreira da Rosa Rinhel2, Gabriel Flores Abuna3
1School of Dentistry, University of Taubate, Taubate, SP, Brazil.
Clinical Oral Investigations
|February 9, 2021
Summary
Applying a low electric current (50μA) during dental adhesive application significantly enhances resin composite-tooth bond strength. This method improves impregnation and is safe for clinical use with various light-curing units.
Area of Science:
- Dental Materials Science
- Biomaterials Engineering
- Adhesion Science
Background:
- Dental adhesives are crucial for bonding restorative materials to tooth structure.
- Optimizing the bond strength and hybrid layer quality of adhesive systems is an ongoing challenge.
- Light-curing units (LCUs) play a vital role in adhesive polymerization and bond durability.
Purpose of the Study:
- To investigate the impact of applying a 50μA electric current on the microtensile bond strength (μTBS) of three different adhesive systems.
- To evaluate the effect of electric current on the hybrid layer morphology under different light-curing conditions.
- To compare the bond strength and failure modes of adhesive systems when applied with and without electric current.
Main Methods:
- Three adhesive systems (two-step etch-and-rinse, two-step self-etch, one-step self-etch) were tested on human molar teeth.
- Electric current (50μA) was applied during the application of adhesives, with control groups receiving conventional application.
- Microtensile bond strength (μTBS) was measured, and fracture patterns were analyzed. Hybrid layer quality was assessed using confocal laser scanning microscopy.
Main Results:
- Electric current application significantly increased the μTBS for all tested adhesive systems, regardless of the LCU used.
- The two-step self-etch system (CSE) demonstrated the highest μTBS when applied with electric current.
- Electric current application resulted in longer resin tags, indicating improved impregnation, and was deemed safe for dentin.
Conclusions:
- Applying a 50μA electric current during the application of dental adhesives enhances bond strength to tooth structure.
- This technique improves the impregnation of adhesive systems, leading to better bond durability.
- The use of electric current is a safe and effective adjunct for improving adhesive performance in restorative dentistry.
