Authors: Harrington GW, Natkin E.
Title: External resorption associated with bleaching of pulpless teeth.
Journal: J Endod
Date: Nov 1979
Citation: 5(11):344-8
Category: Bleaching/Tooth Whitening
Evidence-based Ranking: 4
Purpose/ Objectives: To suggest that external resorption of cervical crown and root structure may be produced by bleaching the crowns of endodontically treated pulpless teeth.

Discussion: Before bleaching, a distinction in interpretation must be made between the possible presence of early cervical resorption and cervical radiolucency. Case histories all present the following common characteristics: 1) In all cases, a caustic bleaching agent and a heat source were used for bleaching procedures. 2) In all cases, the resorptive lesions occurred in the cervical third of the root with no evidence of resorption elsewhere on the root. 3) All patients denied a history of trauma after the initial traumatic incidents that devitaized these teeth. Hypothesis of cervical resorptions: 1) either initial trauma or trauma to these teeth after bleaching. 2) Superoxol could initiate an inflammatory resorptive process by diffusing through patent dentinal tubules. 3) Resporptive process may be related to injury to the periodontium by the heat from the heat lamp.

ReviewerÂ’s Comments: This study is probably one of the first to report the cervical resorptions related to internal bleaching since the introduction of the technique in 1963 by Nutting and Poe.