Letter to the Editor regarding "Depletion of water molecules during ethanol wet-bonding with etch and rinse dental adhesives".

I would like to comment on the above titled paper that recently published in Materials Science and Engineering C 33:21-27 (2013). I mentioned potential deficiencies in the study design. Then, I argued some statements made in the paper about interactions between bounded water around collagen molecules and resin infiltration, hence longevity of resin bonding. It is important to highlight these concerns regarding this paper so that readers are provided with another view of the ethanol wet-bonding concept.