AI Article Synopsis
- This study aimed to investigate the impact of evaporation on the shelf life of a one-bottle universal adhesive called Scotchbond Universal (SBU).
- Three versions of the adhesive were tested: SBU0 (maximal evaporation), SBU50 (50% evaporation), and SBU100 (no evaporation), measuring their degree of conversion and bond strength to dentin.
- Results indicated that SBU100 had the highest degree of conversion, while SBU0 had greater ultimate microtensile strength but lower bond strength to dentin; notable negative effects on bond strength emerged only after over 50% evaporation.
Article Abstract
Objectives: The purpose of this study was to evaluate how evaporation affects the shelf life of a one-bottle universal adhesive.
Methods: Three different versions of Scotchbond Universal (SBU, 3M ESPE, Seefeld, Germany) were prepared using a weight-loss technique. SBU0 was left open to the air until maximal weight loss was obtained, whereas SBU50 was left open until 50% of evaporation occurred. In contrast, SBU100 was kept closed and was assumed to contain the maximum concentration of all ingredients. The degree of conversion (DC) was determined by using Fourier transform infrared spectroscopy on different substrates (on dentin or glass plate and mixed with dentin powder); ultimate microtensile strength and microtensile bond strength to dentin were measured as well.
Results: DC of the 100% solvent-containing adhesive (SBU100) was higher than that of the 50% (SBU50) and 0% (SBU0) solvent-containing adhesives for all substrates. DC of the adhesive applied onto glass and dehydrated dentin was higher than that applied onto dentin. Even though the ultimate microtensile strength of SBU0 was much higher than that of SBU50 and SBU100, its bond strength to dentin was significantly lower.
Conclusions: Evaporation of adhesive ingredients may jeopardize the shelf life of a one-bottle universal system by reducing the degree of conversion and impairing bond strength. However, negative effects only became evident after more than 50% evaporation.
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| http://dx.doi.org/10.2341/13-195 | DOI Listing |
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