1. Abouassi T, Wolkewitz M, Hahn P (2011) Effect of carbamide peroxide and hydrogen peroxide on enamel enamel surface: an in vitro study. Clin Oral Investig 15:673–680
2. Ake-Linden L (1968) Microscopic observations of fluid flow through enamel in vitro. Department of Oral Histopathology, Karolinska Institute, School of Dentistry, Stockholm, Sweden Report Nr Op.R(4).
3. Al-Saleni SK, Wood DJ, Hatton PV (2007) The effect of 24h non-stop hydrogen peroxide concentration on bovine enamel and dentin mineral content and microhardness. J Dent 35:845–850
4. Albers H (1991) Lightening natural teeth. ADEPT Report 2:1–24
5. Arcari GM, Baratieri LN, Maia HP, De Freitas SF (2005) Influence of the duration of treatment using a 10% carbamide peroxide bleaching gel on dentin surface microhardness: an in situ study. Quintessence Int 36:15–24