Epidemiologic Evaluation of Malocclusion in primary teeth of 3-5 year old children in Qazvin, IRAN

A dentist should be has a good primary background in diagnosis of growing children malocclusion and how they are created; Natural agents of growth should be recognized so that it can be detected abnormal factors early. Because of the prevention of any disease is an essential and consider to it, can reduce the much cost and time to meet the treatment needs in future, it is required the existence of a basic information series that it can indicate the discussed problem and its etiologic factors in achieving the desired objects - that it is the provide a context for proper planning of prevention.The main purpose of this study is a survey of malocclusion frequency epidemiology in primary teeth system, in the 3-5 years old children of Qazvin in 1390. In this study population Included 400 children 3-5 years, boys and girls in Qazvin kindergartens in 1389-90, that each selected person was considered as a statistical unit. First proposal was prepared and after approval, permission of examination for kindergarten children in ages 5-3 years old was received from the State Welfare Organization of Qazvin city. All examinations has been done in appropriate light and on the class chair in children sitting position by a general dentist under the supervision of a specialist in pediatric dentistry and findings were recorded in the pre-prepared form. The frequency of occlusion status in second primary molar was as follows: FTP Malocclusion, 5/49%, MS malocclusion, 34/5%, and DS malocclusion 16%. The rate of frequency for anterior - posterior relationship of canines in studied population was: People who were the CLI, 77/8%, people who were CLII, 6/21%, and People who were C 1 lI was %0/6.