Chemical stability of two dentin single-bottle adhesives as a function of solvent loss

Ismael Henry Yevenes, Maria Olga Baltra, Iván Urzua, Juan Reyes, Ljubica Petrasic

Abstract


Purpose: Two single-bottle dentin adhesive systems, Single-Bond and Prime and Bond NT, containing ethanol-water or acetone as solvents, respectively, were investigated for their chemical stability regarding solvent loss.
Methods: Stability was measured by the adhesive weight changes in accelerated degradation tests under higher room temperature and relative humidity (RH) than normal conditions over 15 days: 25±2ºC / 60±5% RH, 30±2ºC / 65±5% RH, 40±2ºC / 70±5% RH, and 50±2ºC / 75±5% RH. For each temperature the slope and the constant rate for weight loss were recorded to obtain the Arrhenius plot. Water content in Single Bond was determined by K Fisher Titration, and total solvent amount was obtained by subtraction from total weight.
Results: The results for Single Bond indicated water content of 5.90±0.08% and alcohol content of 39.14±1.19%. For Prime and Bond NT the acetone percentage was 43.08±1.15%. Weight changes after the accelerated degradation tests revealed that solvent loss in Single-Bond adhesive was lower than in Prime and Bond NT adhesive.
Conclusion: The results suggest that chemical stability of adhesives containing ethanolwater is greater than formulations containing acetone.
Key words: Stability; solvent; dentin adhesive

Keywords


Stability; solvent; dentin adhesive

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e-ISSN: 1980-6523

ISSN-L: 0102-9460

 

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