AI Article Synopsis
- 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.
Article Abstract
Purpose: This in vitro study evaluated the effect of sodium carbonate (Na₂CO₃) concentration on adhesion between two layers of irreversible hydrocolloid wash impression material.
Methods: The first layer of irreversible hydrocolloid was brushed with three concentrations (0.1, 0.7, or 7.0 wt.%) of Na₂CO₃. Irreversible hydrocolloid not brushed with Na₂CO₃ was used as a negative control. Adhesion between the two layers (bond strength and adhesion energy) was then evaluated using a traction test, and the fracture modes were identified. The results of traction test were analyzed with a one-way ANOVA followed by a Tukey post hoc test. Chi-square test was used for analyzed failure mode after testing (α= 0.05).
Results: The bond strength (0.034 ±0.005 MPa) and adhesion energy (60.240 ±12.817 J.m⁻ ²) of the 0.7% Na₂CO₃ group were significantly higher than those of the other groups (P< 0.05). The 0.7% Na₂CO₃ group displayed only cohesive failure (ײ= 16; P< 0.0001).
Clinical Significance: Conditioning the surface of the first layer of irreversible hydrocolloid with 0.7% sodium carbonate improved adhesion between the two layers and may help clinicians improve the quality of the preliminary impressions of removable complete dentures.
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