ABSTRACT
Objective: To study the relationship between orthodonti c treatment and temporomandibular joint disorders(TMD). Methods: The survey tables and their corresponding database were designed with the aid of computer. The questionnaire and clinical examination were administered t o 173 cases who had received orthodontic treatment (orthodontic group), 95 case s with morphologic malocclusion and without having orthodontic treatment ( maloc clusion group) and 32 cases with normal occlusion (normal group).Symptoms and s igns of TMD were collected,the data were analyzed with the databases. Results: The survey tables and their corresponding database were se t up. There were statistically significant differences between the orthodontic g roup and malocclusion group in the distribution of anamnestic, clinical dysfunct ion and occlusion indices (P