Effects of Jones Jig Appliance in Maxillary First Molar Distalization

The purpose of this study was to evaluate treatment effects of Jones jig appliance during class-II molar correction with a focus on the magnitude of maxillary first molar distalization, its tipping, extrusion and rotation as well as anchorage loss at premolarincisor unit. A complete set of pre and post distalization records including history, clinical examination, Lateral cephalometric radiograph, Orthopentomogram, study casts and photographs was taken for each patient. Pre and post distalization lateral cephalometric radiographs were traced for evaluation of molar, premolar and incisors movements while models were used to find out molars rotation. Results showed that there was 5.30 mm space created between molar and premolar during 5.65 months; out of which 3.30 mm (62.26 %) showed molar distalization and 2.00mm (37.74 %) anchorage loss. There was 6.70° molar tipping with 0.70 mm extrusion while second premolar showed 7.58° tipping and 1.58 mm extrusion. Incisors exhibited an insignificant labial tipping of 0.75°. Both right and left molars showed 2.00° and 2.55° highly significant disto palatal rotation