Ramus Width Augmentation: Andrade & Lander
4 of 11

Alberto Andrade-Guerra, DDS, Alberto Lander, DDS

Distraction Appliances

Our second device was designed for increasing the mandibular cortical width in the corpus and ramus. The device has a similar structure and consists of an implantable interosseous internally threaded implant and a distraction rod. The 3.75 mm diameter hollow implant includes a 1.0 mm tall by a 5.0 mm diameter base. The difference in diameters of the implant cylinder and implant base provides a lip that pushes the transport bone segment when the distraction rod is turned. Similarly, the end of the distraction rod includes a special slot for the screw driver. A tiny titanium disc is used at the opposite end of the distraction rod, allowing the rod to freely rotate on bone surface. After completion of distraction, the distraction rod is removed, and the implant is left in situ.

FIG. 6.4.3.3, 6.4.3.4. Diagram (left) and photograph of the model(right) demonstrating the structure and operation of distraction device for expansion of the mandibular cortical width in the corpus .