Nakamura T, Nakajima H, Salimee P, Hino T, Maruyama T
Department of Fixed Prosthodontics and Occlusion, Faculty of Dentistry, Osaka University, Japan.
Asian J Aesthet Dent. 1993 Jan;1(1):25-8.
Vital bleaching is considered effective for reduction of tooth discolouration. This evaluation was to measure colour changes before and after bleaching of vital tetracycline-discoloured teeth in three patients. Vital bleaching of their anterior maxillary teeth was performed five times at weekly intervals. Tooth colour was measured with a small-area colorimeter before, immediately and two, four and six months after bleaching. The results were expressed in the CIE Lab* colour system. The L* value, a lightness variable, increased after bleaching. The a* value changed only negligibly, but the b* value decreased after bleaching showing changes in the tooth colour from yellow to blue. The colour differences before treatment and six months after bleaching was visually perceivable.
