For the purpose of correct diagnosis. Appropriate treatment planning and improvement of prediction in prognosis of squamous cell carcinomas arising at the mandibular gingiva, evaluation on the prognosis according to the radiographic bone
resorption
feature and extent of the gingival squamous cell carcinomas of the mandible was performed with 54cases of squamous cell carcinomas arising the mandibular gingiva among the 197 intraoral squamous cell carcinomas to have been diagnosed and
followed-up in
the Department of Oral and Maxillofacial Surgery, Seoul National university Hospital from the 1st of January, 1983 to the 31th of December, 1992.
@ES The results were as follows:
@EN 1. In the classification according to the feature 15 cases were erosive type and 30 cases were invasive type. According to the extent of bone resorption of mandible, cases extended to the inferior alveolar canal(D) was 27 cases(50.0%), cases
above
the inferior alveolar canal(C) was 10 cases, cases of no bone involvement(A) was 9 cases and cases limited to alveolar portion was 8 cases.
overall 5-year survival rate of all patients was 19.4% and in the treated cases regardless of methods, 5-year survival rate was 24.5%.
In the cases of invasive type bone resorption, 5-year survival rate was 12.0%, in contrast with 30.8% of invasive type.
Comparison between the extent of bone resorption, in the cases of no bone resorption(A) 5-year survival rate was 26.0%, in the cases of bone resorption above the inferior alveolar canal(C) and 14.3% in the cases of the bone resorption extended
beyond
the canal(D).
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