Influences of surface and solvent on retention of HEMA/mixture components after evaporation

Autor(es)

Garcia, Fernanda C. P. ^[1] ; Wang, Linda ^[2] ; Pereira, Lucia C. G. ^[3] ; de Andrade e Silva, Safira M. ^[4] ; Junior, Luiz M. ^[2] ; de Oliveira Carrilho, Marcela Rocha ^[5]

Afiliação do(s) autor(es)

^[1] Univ Brasilia, Dept Restorat Dent, Dent Mat Area, BR-70910900 Brasilia, DF - Brazil

^[2] Univ Sao Paulo, Bauru Sch Dent, Dept Operat Dent, Bauru, SP - Brazil

^[3] UniEvangelica, Anapolis Sch Dent, Goias, Go - Brazil

^[4] UNIME, Coll Hlth & Agrarian Sci, Lauro De Freitas, BA - Brazil

^[5] Univ Bandeirante Sao Paulo, GEO, Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Dentistry; v. 38, n. 1, p. 44-49, JAN 2010.
• Citações Web of Science: 12

Resumo

Objectives: This study examined the retention of solvents within experimental HEMA/solvent primers after two conditions for solvent evaporation: from a free surface or from dentine surface. Methods: Experimental primers were prepared by mixing 35% HEMA with 65% water, methanol, ethanol or acetone (v/v). Aliquots of each primer (50 mu l) were placed on glass wells or they were applied to the surface of acid-etched dentine cubes (2 mm x 2 mm x 2 mm) (n = 5). For both conditions (i.e. from free surface or dentine cubes), change in primers mass due to solvent evaporation was gravimetrically measured for 10 min at 51% RH and 21 degrees C. The rate of solvent evaporation was calculated as a function of loss of primers mass (%) over time. Data were analysed by two-way ANOVA and Student-Newman-Keuls (p < 0.05). Results: There were significant differences between solvent retention(%) and evaporation rate (%/min) depending on the solvent present in the primer and the condition for evaporation (from free surface or dentine cubes) (p < 0.05). For both conditions, the greatest amount of retained solvent was observed for HEMA/water primer. The rate of solvent evaporation for HEMA/acetone primer was almost 2- to 10-times higher than for HEMA/water primer depending whether evaporation occurred, respectively, from a free surface or dentine cubes. The rate of solvent evaporation varied with time, being in general highest at the earliest periods. Conclusions: The rate of solvent evaporation and its retention into HEMA/solvent primers was influenced by the type of the solvent and condition allowed for their evaporation. (C) 2009 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 01/06140-1 - Avaliação laboratorial da resistência adesiva de resinas compostas à dentina tratada com primers experimentais
• Beneficiário: Fernanda Cristina Pimentel Garcia
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 02/13981-5 - Avaliação da resistência adesiva de resinas compostas à dentina tratada com primers experimentais, utilizando-se solventes anidros
• Beneficiário: Elizandra Paccola Moretto
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica
• Processo FAPESP: 02/06682-1 - Avaliação da resistência de união de sistemas adesivos hidrofílicos e hidrofóbicos à dentina tratada com solventes anidros
• Beneficiário: Ricardo Marins de Carvalho
• Modalidade de apoio: Auxílio à Pesquisa - Regular