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Introduction: There is a high concern regarding air contamination in the dental clinics and offices. For the reason that the most risking factor is the presence of floating particles in the clinics containing different disease-causing microorganisms and in order to provide a better strategy to improve the condition, the present article takes into consideration the study of the air inside the medical centers affected by the microbial and fungal contamination. Methods: A descriptive study (from 1391 to 1392) was conducted in clinics and dental offices in Kerman. Among the 14 clinics in the city of Kerman, two state dental clinics, three private clinics, a semi- private clinic, a charity - based clinic and from the totality of 143 dental offices throughout the city, 52 were chosen. Random sampling method was used. Sampling was done by sedimentation. The medium used nutrient agar, blood agar, nutrient agar and Sabouroud dextrose agar . Gram stain and culture of bio-chemical environment and culture slides were used for detection. Sampling Sit characteristics such as size, number of units, size of space, time, travel, type of service and the turbine were recorded. Chi-square test and Fisher’s exact test was used for statistical analysis. Results: Of the the samples surveyed, 89% showed fungal and bacterial contamination. The bacterial species found included: gram positive cocci 60.2%, gram negative cocci 24.1%, basillus gram positive bacillus 11.2%, gram negative bacillus 2.4%, and also fungi 1.2%.There was a significant relationship between contamination rate, number of clients, space (clinics and dental offices, users, non working and working shifts). Conclusion: Degree of microbial contamination of air clinics and dental offices of Kerman, ranked according to AMI, shows bad condition. There is a necessity to rank the dental clinics and offices from good to bad. The ventilation system improvement needs a high consideration.

Keywords: dental, contamination, microbial, fungal, Kerman

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