Aim: Aim of this study was to evaluate osseodensified crestal sinus lifting 
technique versus the lateral sinus osseodensified technique with Simultaneous Implant 
Placement. Subjects and methods: Twenty patients were randomly divided into two 
groups. Group (I) Ten patients were operated upon after performing computer guided 
crestal sinus lift using Osseodensification with simultaneous implant placement. Group 
(II) Ten patients were operated upon after performing computer guided lateral sinus 
lifting technique with simultaneous implant placement. Vertical bone height (mm) and 
bone density were taken at time of implant placement and 6 months postoperatively. 
Results: both groups showed a non significant difference in b vertical bone height. 
Crestal group (I) had showed a significant higher bone density than lateral group 
(II) (p=<0.001). Crestal group (I) had a significant shorter surgical time than lateral 
group (II). Conclusion: Crestal sinus lifting technique may be proposed as a possible 
alternative procedure for the lateral sinus osseodensified technique with Simultaneous 
Implant Placement