DENTAL AND SKELETAL CHANGES AFTER INTRAORAL MOLAR DISTALIZATION WITH SECTIONAL JIG ASSEMBLY

The present study was conducted on 10 subjects to evaluate dental and skeletal changes after intraoral molar distalization. The maxillary mo lars were distalized with a sectional jig assembly. Sentalloy open coi l springs were used to exert 150 gm of force for a period of 12 weeks. A modified Nance appliance was the main source of anchorage. The pre- and postdistalization records included dental study casts, clinical p hotographs, and cephalograms. A total of 665 readings recorded from la teral cephalograms and dental casts were subjected to statistical anal ysis. The mean distal movement of the first molar was 2.78 mm, which w as highly significant (p < 0.001). It moved distally at the rate of 0. 86 mm/month. There was clinically some distal tipping (3.50 degrees) a nd distopalatal rotation (2.40 degrees). These changes were statistica lly significant (p < 0.001). The second molars accompanied the first m olars and moved distally by nearly the same amount. There was 1.00 mm increase in the overjet and 2.60 degrees mesial tip of second premolar . The changes in the facial skeleton and dentition bases were minimal and statistically not Significant. However, there was clockwise rotati on of the mandible of 1.30 degrees that was statistically significant. This was the result of molar extrusion (1.60 mm).