PMID- 19655475 OWN - Quintessenz Verlags-GmbH CI - Copyright Quintessenz Verlags-GmbH OCI - Copyright Quintessenz Verlags-GmbH TA - Int J Esthet Dent JT - International Journal of Esthetic Dentistry IS - 2198-591X (Print) IP - 1 VI - 1 PST - ppublish DP - 2006 PG - 52-61 LA - en TI - Nonvital Bleaching: General Considerations and Report of Two Failure Cases FAU - Dietschi, Didier AU - Dietschi D CN - AB - This paper describes the rationale and procedures for noninvasive treatment of discolored nonvital teeth using the walking bleach technique. The limitations of this procedure and, in particular, the unpredictable color stability following nonvital bleaching are discussed and illustrated with two cases of rapid discoloration relapse. The possible reasons for treatment failure are examined and show that current knowledge regarding the origin and prevention of discoloration is limited. AID - 851921