Histopathological diagnostic services during the past 10 years in Department of Dentistry and Oral Surgery, Nagoya National Hospital(1978-1987). The types and frequency of the lesions.:The types and frequency of the lesions

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During the ten years from April, 1978 to December, 1987, the number of cases of pathological histology examination conducted at the Department of Dentistry and Oral Surgery in the National Nagoya Hospital ammounted to 610; 519 cases of disease were found. 1) The largest disease group was radicular cyst which accounted for 19.2% of all cases, followed by mucoceles (12.0%), squamous cell carcinoma (8.4%), fibroma (8.0%), periapical granuloma (6.3%), epulis (5.2%), and various others in lesser numbers. (2) The maximum number of the case of disease was radicular cyst, accounting for 20.7% of all cases of disease, followed next by the mucocele (13.0%), fibroma (8.1%), periapical granuloma (7.7%), postoperative Wangenzyste (6.3%), and others in lesser numbers.(3) The number of histological examinations for one case of disease was high in neoplastic diseases such as 3.3 cases for admantinoma, and 2.2 cases for the squamous cell carcinoma. (4) Cystic disease were by for the largest disease group accounting 39.8% for of all cases followed next by neoplasm (111 cases, 21.6%), paradentium diseases (83, 15.4%), oral mucosa cases (41, 7.9%), salivary gland cases (36, 7.0%), maxillary cases (16, 3.1%), and other cases (25, 4.8%).