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The aim of the study was to find the way of distribution of dental chairs in Duhok City and to evaluate the need for replacement of the damage parts. In addition to that to compare the efficiency of dental units in the College of dentistry with those in poly clinic in Duhok City.100 dental chairs were involved in this study, questioner was prepared for this reason and was filled by taking the information from the engineer responsible for maintaining the unit. A scores were chosen to measure the no. of the damage parts selected previously .the result showed that the distribution of the units were from different companies due to their import in different time interval, and the Aedic dental chairs (USA) showed the largest distribution and better performance. In conclusion one can say Aedic dental chairs need the least replacement.

Distribution of Dental Chairs in Duhok City According to their Manufacture Origin, And Their Need to Replace the Failure Parts