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:
Lateral periodontal abscess
Acute apical abscess
Acute serous pulpitis
Chronic ulcerative pulpitis
Acute suppurative pulpitis
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