Using of summers' osteotome technique by bone osteotomes for closed sinus lifting then evaluation the amount of bone height gain will be done radiographically (by panorama and CBCT) after implant placement in posterior edentulous maxilla .

Evaluation of patient satisfaction numerically will be done after using summers' osteotome technique by bone osteotomes for closed sinus lifting in posterior edentulous maxilla

Using of recent closed minimally invasive technique (hydraulic left technique) by hydraulic lifter device for closed sinus lifting then evaluation of the amount of bone height gain will be done radiographically (by panorama and CBCT) after implant placement for patients with posterior edentulous maxilla .

Evaluation of the amount of bone height change radiographically after closed sinus lift simultaneously with implant placement using hydraulic lift technique versus summers' osteotome technique in posterior edentulous maxilla

Evaluation of patient satisfaction by using specific numerical questionnaire which depends on numerical scale after closed sinus lifting procedure with implant placement using hydraulic lift technique versus summers' osteotome technique in posterior edentulous maxilla .

The patient satisfaction numerical questionnaire include several questions to the patient and the patient will put a circle sign on the mark at which he or she feels to represent the answer .

The numerical scale is from 1 to 5 for each question (with total of 20 questions) :

1. represents strongly disagree
2. represents disagree
3. represents neither agree or disagree
4. represents agree
5. represents strongly agree

The final score is out of 100 so, more higher scores represents more patient satisfaction and so, better outcome and less scores represents less patient satisfaction and so, worse outcome.