In vitro assessment of solvent evaporation from commercial adhesive systems compared to experimental systems.
Solvents should be properly evaporated after application to dental substrates. The aim of this study was to assess the evaporation of commercial, experimental and neat solvents. The tested null hypotheses were that there are no differences in solvent evaporation regardless of its formulation and over time. Evaporation from commercial adhesive systems (Scotchbond Multipurpose Primer, Scotchbond Multipurpose Adhesive, Prime & Bond NT, Multi Bond, Excite, Single Bond 2, Adhese Primer, Adhese Bond, Xeno III A and Xeno III B) and experimental primers (35% HEMA plus 65% acetone or ethanol or water v/v) were compared to neat solvents (acetone, ethanol and water). Samples (10 microL) of these products were dripped into glass containers placed on a digital precision balance. Evaporation was assessed at 0, 5, 10, 15, 30, 60, 120, 300 and 600 s times to calculate mass loss. Data were analyzed statistically by ANOVA and Bonferroni's correction (a=0.05). Acetone-based products exhibited a remarkable capacity to evaporate spontaneously over time. Neat acetone evaporated significantly more than the HEMA-mixtures and the commercial formulations (p<0.05). The incorporation of monomers and other ingredients in the commercial formulations seem to reduce the evaporation capacity. Solvent evaporation was time and material-dependent.
Nihi
Fabio Mitugui
FM
Department of Dentistry, University North of Paraná, Londrina, PR, Brazil.
Fabre
Hebert Samuel Carafa
HS
Garcia
Georges
G
Fernandes
Karen Barros Parron
KB
Ferreira
Flaviana Bombarda de Andrade
FB
Wang
Linda
L
D000096:Acetone / Q000737:chemistry; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D000431:Ethanol / Q000737:chemistry; D008422:Materials Testing; D019279:Resin Cements / Q000737:chemistry*; D012997:Solvents / Q000737:chemistry*; D013997:Time Factors; D014835:Volatilization; D014867:Water / Q000737:chemistry
D017220:Dentin-Bonding Agents; D019279:Resin Cements; D012997:Solvents; D014867:Water; D000096:Acetone; D000431:Ethanol