Objective
Osseodensification technique preserves bone tissue and facilitates compaction autograft within the osteotomy site which result in expansion of alveolar bone surrounding the implant. 
Aim 
The purpose of the study to evaluate the change of bone width after osseodensification technique in which have ability to compaction autografting at the implant site compared with the other osteotomy techniques.
Material and Methods
This prospective study enrolled patients with residual bone width < 5 mm in posterior regions of mandible. All the patients were treated with dental implants using osseodensification drilling technique (ODT). At the implant site, the change of alveolar bone width was measured using UNC-15 periodontal probe. Also, the insertion torque values were recorded at implant placement. Wilcoxon signed rank test was used for statistical analysis with a significance level .05. 
Results
Thirteen patients were included in this study. A total of 22 implants were placed with a diameter of 4.2 mm (54.5%) and 3.8 mm (45.5%). Minor additional grafting was required at the buccal aspect of three implants, however, no dehiscence or fenestration were recorded in the surgical sites. The median value of the alveolar bone width was 3.5 mm (range 3 to 4 mm) prior to treatment; the median alveolar bone width increased to 5 mm (range 5 to 6 mm) after ODT.  The difference was statististically significant (p=0.001). The median of insertion torque value was 40 Ncm (range 35 to 45 Ncm).  
Conclusion 
Osseodensification technique used in implant site preparation showed positive results on alveolar bone dimensions. It is concluded that this technique may eliminate to need of bone graft materials in augmentation surgeries.

Hard tissue changes by osseodensification technique in narrow alveolar ridges: a pilot study

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