Abstract
Epulis is a benign polypoid lesion of the gingiva, that is histopathologically classified as epulis granulomatosa, epulis fibrosa, epulis hemangioma, epulis osteoplastica, and epulis giant cell tumor. In particular, epulis osteoplastica is relatively rare. In the present study, we retrospectively evaluated the clinical data of 116 cases of epuli（s 47 males and 69 females）diagnosed in the Division of Oral and Maxillofacial Reconstructive Surgery, Department of Oral and Maxillofacial Surgery, Kyushu Dental College over the past 20 years. The cases were classified into groups on the basis of histopathological type, following which the site of involvement , size of the mass, and duration between awareness of the presence of the mass and the first examination were evaluated. In addition, we retrospectively evaluated the histopathological data of epulis osteoplastica cases.
Of the 116 cases, 44 were those of epulis granulomatosa（average age; 59.3 years）, 61 of epulis fibrosa
（average age; 57.0 years）, and 11 of epulis osteoplastica（average age; 50.7 years）. Epulis granulomatosa and epulis fibrosa were mostly located in the anterior part of the maxilla, whereas epulis osteoplastica was mainly located in the anterior part of the mandible. The average length of epulis granulomatosa lesions
（major axis）was 10.8 mm, that of fibrosa lesions was 11.5 mm, and that of osteoplastica lesions was 14.5 mm as observed by the naked eye. The average duration between awareness of the presence of the mass and the first examination was 82 days for epulis granulomatosa, 569 days for epulis fibrosa, and 795 days epulis osteoplastica.
Analysis of clinicohistopathological data of the epulis osteoplastica cases revealed a correlation between patientʼs age and bone formation ratio.
This study suggested that the time change epulis organization for epulis osteoplastica.
https://ror.org/03bwzch55 
