External Root Resorption of the Mandibular Second Molar Associated with Completely Impacted Third Molar: A Case Report and Review of the Literature

Abstract

External root resorption (ERR) of permanent teeth is believed to result from mechanical or inflammatory factors, such as the force pressure of orthodontic appliances, dental trauma, cysts or tumours, chronic apical periodontitis, and poor regeneration of the periodontium in reimplanted or transplanted teeth. Another factor frequently associated with ERR of second molars is an unerupted third molar close to the root of the second molar. This type of root resorption has been observed at the site of contact with the impacted tooth, indicating that the impacted tooth's pressure participates in the resorption process. Though this resorption mechanism is not yet apparent, some investigators deem it similar to the mechanism involved in the resorption of primary teeth. This case report aims to describe a second molar resorption case triggered by an impacted third molar and perform a literature review. Key Words External Root Resorption, Mandibular third molar, Pressure resorption,