Injectable platelets rich fibrin was prepared where 10 ml of patient venous blood was centrifuged without anti-coagulants (plain plastic glass-coated) at 700 rpm speed for only 3 minutes, xenograft was mixed with I-PRF to make sticky bone, sticky bone was placed into extraction socket till the socket was fully filled up to the gingival margin

Hyaluronic acid (HA) syringe containing 1 mL of cross-linked hyaluronic at a concentration of 20 mg/ml in a saline phosphate buffer solution at sterilized content was used. HA was mixed with particulate xenograft 1:10 ratio to form a putty consistency for condensation and was placed into extraction socket till the socket was fully filled up to the gingival margin

Xenograft was mixed with saline, placed in extraction socket till the socket is fully filled up to the gingival margin

Injectable platelets rich fibrin is added to xenograft for alveolar ridge augmentation in order to preserve bone and decrease bone resorption

Cone beam CT (CBCT) were obtained preoperatively and 4 months postoperatively. The radiographs were analyzed using One- Viewer viewing software (iCATVision). The buccolingual width was measured into different levels. At the bone crest (A), 3mm from the bone crest (B) and 6 mm from the bone crest (C). For standardization in the sagittal slice, the axial plane was adjusted to pass through the cemento enamel junction (CEJ) of the adjacent teeth. On the axial slice, the mesiodistal dimension from the distal surface to mesial surface of the adjeceent teeth was measured. The coronal plane was adjusted to be pass through the middle of the distance in order to be perpendicular to both buccal and lingual cortices. Measurement were all performed on the coronal slices. In addition, fusion was done by superimposing preoperative and 4 months CBCT in all groups.

The biopsy samples were harvested and processed. All samples were serially sectioned using a microtome. Slides were stained separately with hematoxylin and eosin and observed using a light microscope. For histological evaluation and histomorphometric analysis, 20 photomicrographs from different sections taken at every 200 µm of each biopsy sample were captured at original magnification 10×, 20×, and 40× using a digital camera. The image analyzer was calibrated to automatically convert the measurement units (pixels) produced by the image analyzer program into actual micrometer units. Data from the sections of each group were averaged.