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Manhart/Trumm<br />
Fig 2 Scoring system for microleakage<br />
evaluation in enamel and dentin.<br />
consists of a C4 body with an alcohol group surrounded by 3<br />
methyl groups, making it totally miscible both with water and<br />
polymerizable resins. Although tert-butanol has a higher molecular<br />
weight than ethanol, the evaporation rate is almost the<br />
same, with a latent heat of vaporization of 41 kJ/mol for tertbutanol<br />
and 42 kJ/mol for ethanol. 15 Vapor pressure of the<br />
different kinds of solvents at 20°C is given as 2330 Pa for water,<br />
4133 Pa for tert-butanol, 5900 Pa for ethanol, and<br />
23,300 Pa for acetone. 14 The properties of tert-butanol make<br />
it possible to use a dappen dish and increase the resin content<br />
of the adhesive, which results in an increase of adhesive<br />
layer thickness and a higher degree of technique robustness<br />
as compared to acetone-based systems. The solvent used for<br />
etch-and-rinse adhesives is a major factor affecting handling<br />
characteristics and performance. 2,17<br />
CONCLUSIONS<br />
The two-step one-bottle tert-butanol-based XP Bond showed<br />
excellent microleakage results in both enamel and dentin,<br />
with the same quality as a well-established three-step etchand-rinse<br />
system.<br />
ACKNOWLEDGEMENTS<br />
This research was sponsored by <strong>Dentsply</strong> DeTrey, Konstanz, Germany<br />
.<br />
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Clinical relevance: The new tert- butanol- based XP<br />
Bond is expected to show good clinical results due to its<br />
chemical composition and technique robustness.<br />
264 The Journal of Adhesive Dentistry
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