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

  • Ismael Henry Yevenes Universidad de Chile
  • Maria Olga Baltra
  • Iván Urzua
  • Juan Reyes
  • Ljubica Petrasic
Keywords: Stability, solvent, dentin adhesive

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

Author Biographies

Ismael Henry Yevenes, Universidad de Chile
Químico-Farmacéutico, Profesor Responsable de los cursos de Química Básica y Química Oral de la Facultad de Odontología de la Universidad de Chile. Investigador en las áreas de caries, fluoruro y colutorios antiplaca. Investigador Responsable para proyectos del Ministerio de Salud de Chile en Caries y Fluorosis y Excreción Urinaria de Fluoruros.
Maria Olga Baltra
Department of Operative Dentistry, Faculty of Dentistry, University of Chile, Santiago, Chile
Iván Urzua
Department of Operative Dentistry, Faculty of Dentistry, University of Chile, Santiago, Chile
Juan Reyes
Department of Chemistry, Faculty of Dentistry, University of Chile, Santiago, Chile
Ljubica Petrasic
Department of Operative Dentistry, Faculty of Dentistry, University of Chile, Santiago, Chile
Published
2008-06-22
Section
Original Article