|Inclusion Criteria||Exclusion Criteria|
|Patients required a bilateral sinus lift for implant treatment in the posterior maxilla one side for crestal approach and other side for lateral approach.||Patients who required a bilateral sinus, in which both the right and left sides were indicated for OSFE per current practice guidelines .|
|Patients were required to undergo a lateral sinus lift procedure if the RBS was a minimum of 2 mm and a maximum of 4 mm.
Patients need to meet the current practice guidelines (minimum of 5mm RBS) to qualify for crestal approach6
|Patients required a bilateral sinus, in which both the right and left sides were indicated for sinus lift by the lateral approach per current practice guidelines [7, 8].|
|At least 1 mm of bone was required on each side for implant stability.||Patients did not consent to participate in the study.|
|Patients were free from any systemic or local contraindications for dental implant placement.||Patient with systemic or local contraindications for dental implant placement.|