Combined periodontic-endodontic lesions are localized, circumscribed areas of bacterial infection originating from either dental pulp, periodontal tissues surrounding the involved tooth or teeth or both.[1]
Combined periodontic-endodontic lesions take the form of abscesses and can originate from either or both of two distinct locations[1] and may be informally subclassified as follows:[citation needed]
Neither the prognosis, treatment nor expected treatment outcome depend on the source of the infection.[2]
A combined lesion may also be the result of a fractured tooth.
Treatment includes conventional endodontic therapy followed by conventional periodontal therapy. If the lesion is deemed too severe for treatment, the involved tooth may require extraction.[citation needed]