ABSTRACT
Diabetes mellitus is one of the most common disorders of endocrine glands, which causes various complications including the increase of susceptibility to many infections such as oral candidiasis. The purpose of the present study was to investigate the association between median rhomboid glossitis [MRG] and diabetes mellitus. In this descriptive study 200 patients were selected randomly from Khorasan diabetes mellitus research center. The data were collected through a questionnaire and oral examination. The data were analyzed using Mann Whitney test, Exact-Fisher test. In the present study, 19% of the diabetic patients male and 81% were female. The examination indicated that 7% of the diabetic patients had MRG. None of the males had MRG and 8.6% of the females had MRG. The highest frequency of MRG-infection was observed in patients over 40 years old, particularly in the age group of 70-79 years old prevalence of MRG was 14.3%. In this study the prevalence of MRG in diabetic patients was 7%