A patient experiences pain and some gingival swelling in the anterior segment of the mandible. The mandibular lateral incisor has a shallow restoration, is tender to percussion and gives a positive response to the electric pulp tester. There is some mobility. The most likely diagnosis is

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   oneguy

   A lateral periodontal abscess is a result of rapidly-growing bacteria within a periodontal pocket. Pain characteristics of a lateral periodontal abscess are very similar to those acute periapical periodontitis. The pain is continuous, and well localized and is exacerbated by biting on the affected tooth. The swelling is usually located more coronally than in acute periapical lesions. The tooth is sensitive to percussion and may be mobile and slightly extruded. The tooth pulp is usually vital.

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