Retrocuspid papilla
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Retrocuspid papilla (RCP) is a small elevated nodules mostly behind the lower canine teeth in humans(Fig.1,2).[1] It is sometimes associated with reactive arthritis.[2]
The RCP are first reported in 1947 and 1965.[3][4] In a Swedish population it was first reported 1994. Among 1150 consecutively examined patients aged 20 –75 years, 10 showed RCP. Among 2000 biopsy cases from 1989 - 1992 in Department of Oral Pathology Lund University, 15 biopsies met the criteria of RCP. [5]
Clinical appearance
The lesions are bilaterally situated in the attached gingiva or close to the border of the mucosa lingual to the two mandibular canines (Fig.1).[6]
However, they could in a few individuals also be seen simultaneously in the molar region and on the lingual side (Fig.2).[7] They were 2–3 mm wide and high and covered with normal mucosa. Their tips were erected or could be folded down, mimicking the entrance of a periodontal abscess, but no duct was present.
Radiographs showed no bone destruction and the depths of the periodontal pockets could not explain the presence of the lesions. They were nonsymptomatic and were not noticed by the patients.[8]
