Development of a new device for maxillary molar distalization with high pseudoelastic forces to overcome slider friction: The Longslider - A modification of the Beneslider

Objective: Skeletally anchored devices have been developed to distalize maxillary molars in class II malocclusion. NiTi springs with high pseudoelastic forces are required to overcome friction and concomitantly create ideal translation force for molar distalization. We present a new maxillary molar distalization device (the Longslider) generating forces of up to gf 600 (5.88 N). Materials and methods: Six patients with class II malocclusion owing to maxillary excess were treated by molar distalization. The required distalization path was laboratory set and delivered chair side. Results: The device deactivated itself automatically at the end of the distance in all cases without dental tipping or any implant-related complications. The average distal translational movement of the first molar was 0.81 ± 0.02 mm/mo. Conclusion: Clinically, owing to the high pseudoelastic forces, the Longslider appliance was effective for tooth translation, generating constant pseudoelastic forces of 350 gf through the desired distalization path.