Development and clinical application of a new distal jet for upper molar distaligation

Objective:To develop a new molar distalization appliance and clinically apply to upper molar distalization of classⅡmalocclusion. Method: Twenty-three patients, ten males and thirteen females with a mean age of 12.6 years, were selected for molar distalization. All presented Class Ⅱmolar relationship. The subjects were all with a well aligned lower dental arch. A new intra-oral molar distalization appliance - , which comprised two premolar bands and two molar bands ,was developed. The anchorage unit was a Nance button. A Ni-Ti coil spring was inserted and 150g distal force was applied to each upper first molar. Cephalometric radiographs were taken and analyzed before and after molar distalization. Result: The upper first molars were distalized bodily, on average 5.8mm in3-6 months. The overbite reduced 2.9 mm and the overjet increased 3.4 mm. For stabilization, the corrected molar relationship was maintained with a Nance button for 3 months. Conclusion: This new Distal Jet achieved bodily distal molar movement with minimum anchorage loss.