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There was no documented information about the subject of this survey    in the country. Regarding the importance of these lesions and their    pathologic changes and considering this epidemiologic survey as  a base    for future analytical researches , the survey seemed to be justified.           A cross - sectional descriptive study was designed and with a cluster –    random sampling the 350 patients selected in five zone of Hamadan, who    were interviewed, and clinically examined at their homes in 1997.              78.8% of the surveyed patients had at least one denture induced soft    tissue lesion. The most common lesion was inflammatory fibrous hyperplsia    (26.8%)and Angular chellitis had the least prevalence(2.5%). Other soft tissue    changes lied between these two rates.           The denture induced soft tissue lesions had considerably more    prevalence than any reports up to the time of survey which need more    investigation.