The relationship between orthodontic treatment and temporomandibular disorders]

To explore the relationship between orthodontic treatment and temporomandibular joint disorder(TMD).The questionnaire and clinical examination were administered in 173 cases who underwent orthodontic treatment (orthodontic group),95 cases with morphologic malocclusion(malocclusion group) and 32 cases with normal occlusion (normal group) to collect symptoms and signs of TMD, the data were analyzed in the databases designed according to the modified Helkimo indices. SPSS10.0 software package was used for Wilcoxon test.There were statistically significant differences between the orthodontic group and malocclusion group in the distribution of anamnestic, clinical dysfunction and occlusion indices(P<0.001). There were statistically significant differences between the orthodontic group and normal group with regard to the distribution of anamnestic, clinical dysfunction indices(P<0.001). No statistically significant differences were found between the orthodontic group and normal group in terms of occlusion indices(P>0.05).The results suggest that patients undergoing orthodontic treatment have more symptoms and signs of TMD in the time ranged.