الفهرس 
. LITERATURE REVIEWOnly 14 pages are availabe for public view
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Abstract
Background: Atrophic alveolar bone presents a unique difficulty, preventing correct implant placement and affecting long-term results. Different techniques are recommended to restore the proper length of the posterior ridge of the mandible and thus achieve proper form and function, one of those is distraction osteogenesis. Refinements in the technique can improve the treatment outcome and decrease postoperative complications.
Aim of this study: this study evaluated the efficiency of biaxial-guided alveolar distraction devices in the treatment of the posterior atrophic mandible.
Patients and Methods: Seven patients with atrophic posterior mandible were included in the study and treated with a guided alveolar distraction device. Patients were examined preoperative and evaluated clinically, and radiographically immediately postoperative, post-activation, and 3 months post-activation to calculate the length gained, bone density at the distracted area, and to evaluate lingual displacement of the distracted segment.
Result: There was a statistically significant difference in the length gained between evaluation times as well as a statistically significant difference in bone density at the distracted area through the study period and there is no lingual displacement of the distracted segment through the distraction periods.
Conclusion: alveolar distraction osteogenesis provides significant vertical ridge augmentation
w hile simultaneous ly expanding soft tissue. It also promotes sufficient b one formation. The
use of surgical guides to guide the osteotomies and to put the distractor on the pre planned
holes accurately increased the accuracy of the operation prevent ed the postoperative lingual
displacement, and dec r eased the postoperative complications
Keywords: Alveolar Distraction, guided distraction, Atrophic, Mandible.