A study was conducted to see how different concentrations of sodium carbonate (Na₂CO₃) affect the adhesion between two layers of irreversible hydrocolloid impression material.
The researchers tested three different concentrations of Na₂CO₃ (0.1, 0.7, or 7.0 wt.%), plus a control group without Na₂CO₃, and analyzed the adhesion strength and failure modes using traction tests.
Results showed that the 0.7% Na₂CO₃ concentration significantly enhanced bond strength and adhesion energy compared to the other groups, and only cohesive failures occurred at this concentration, indicating better quality in dental impressions.