الفهرس 
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Abstract
Aim of the study: To evaluate a compaction auto grafting technique of bone (osseo densification) versus bone expander technique in replacement of missed posterior teeth in knife edge mandibular ridge. Patients and methods: Sixteen implants were placed in Nine patients with a partially edentulous knife edge posterior mandibular ridge who attended the outpatient clinic, Oral Surgery Department, Faculty of Dentistry, Mansoura University divided into two groups: group I: Eight implants were subjected to implant site preparation with bone expander`s technique. group II: Eight implants were subjected to implant site preparation with Osseo densification technique. All patients were assessed clinically 3months, 6 months after implant placement regarding to implant stability, pocket depth and modified sulcus bleeding index and radiographically immediately and 6 months after implant placement for marginal bone loss and degree of ridge expansion. Results: All implants were considered successful after 6 months of follow up, As regarding horizontal width gain, there was no statistically significant difference in width gain when comparing the two groups with mean width gain 3.27mm and 3.35mm in Expanders group and osseodensification group respectively. But, There was Statistical significant difference in width before and after operation in both groups. As regarding marginal bone loss MBL, there was significant decrease in both buccal and lingual bone height at 6 months postoperative when compared to the immediate postoperative bone height in both groups. And also Statistical significant differences between the two groups with increase in the Buccal and lingual bone loss in group I. Conclusion: Based on the results obtained from our study, we concluded that the use of osseodensification procedure in expansion of knife edge posterior mandibular ridge could yield better results in terms of implant stability and marginal bone levels but had a similar results regarding the degree of ridge expansion when compared to the manual bone expansion technique as the densah burs allow for bone preservation and condensation through compaction autografting during osteotomy preparation.