• Bone graft [NanoBone® granulate 0,6 mm (24% Silica / 76% Hydroxylapatite)] is mixed with the patient blood and placed to cover the screws completely, the defect is overcorrected with particulate material in anticipation of future graft resorption.
• PRF membrane is prepared by:

Ten milliliters of whole venous blood will be collected in sterile glass test tubes without anticoagulant. Then the test tubes will be placed in a table centrifuge machine at 3000 revolutions per minute (rpm) for 10 minutes.After separation of PRF, the membrane is prepared compression device.

• All patients were operated under local or general anaesthesia according to the case and patient tolerability.
• The oral cavity was prepared by 0.12% chlorhexidine mouthrinses solution* for thirty seconds.
• Full thickness incision down to the bone with blade no.15.
• A periosteal elevator was used to perform mucoperiosteal flap.
• Gentle elevation of the flap
• Fixation of the screws over the alveolar ridge with about 5 mm of the screw threads will be exposed
• Bone graft was mixed with the patient blood and placed to cover the screws completely.
• PRF membrane was be placed over the grafted sites.
• Repositioning of the flap and suturing with 3/0 black silk suture material

Pain was assessed through on a 10-point Visual Analogue Scale (VAS). (0-1= None, 2-4= Mild, 5-7= Moderate, 8-10= Severe)

Edema was evaluated by its ability to pit.The examiner fingers pressed into dependent area of the patient skin for 5 seconds. The finger sinks into the tissue and leave an impression when they are removed. The pitting was graded on a scale of +1 to +4 as follows:

• 1 (trace) slight indentation rapid return to normal.
• 2 (mild) the indentation returns to normal in a few seconds.
• 3 (moderate) 6 mm indentation rebounds in 10-20 seconds.
• 4 (severe) 8 mm indentation rebounds in more than 30 seconds.

A Cone Beam Computerized Tomography was obtained to assess the gained bone height &density.