The impacted third molar.
D003803:Dentigerous Cyst / Q000209:etiology; D006801:Humans; D008963:Molar / Q000601:surgery; D010497:Pericoronitis / Q000209:etiology; D010510:Periodontal Diseases / Q000209:etiology; D014081:Tooth Extraction / Q000009:adverse effects; D014091:Tooth Resorption / Q000209:etiology; D014095:Tooth, Impacted / Q000150:complications* / Q000601:surgery