Effects of a three-dimensional bimetric maxillary distalizing arch

This study aimed to investigate the dental effects of a three-dimensional ( 3D) bimetric maxillary distalizing arch. The Wilson rapid molar distalizati on appliance for Class II molar correction was used in 14 patients (10 girl s and four boys with a mean age of 12.18 years). The open coil springs were activated with bent Omega stops and Class II intermaxillary elastics. The mandibular anchorage was gained by a 0.016 x 0.016 utility arch with a 3D l ingual arch or a lip bumper with a standard lingual arch. The lateral cepha lograms taken before and after treatment formed the material of the researc h. A Wilcoxon test was used to statistically evaluate the treatment effects . The results showed that the distal tipping of the maxillary first and secon d molars, and first and second premolars and canines were statistically sig nificant. Significant distal movement occurred in all posterior and canine teeth. The maxillary first molar distalization was found to be 3.5 mm. The maxillary incisor showed significant proclination and protrusion. The decre ase in overbite was found to be statistically significant. The mandibular p lane angle significantly increased by a mean of 0.5 mm. In addition, signif icant soft tissue changes were observed.