The present study was conducted on 24 implants inserted in six patients (5 females and one male) seeking implant placement of their lost teeth selected from outpatient clinic; Oral and Maxillofacial Surgery Department, Faculty of Oral and Dental Medicine, Cairo University. The aim of current study was to evaluate the accuracy of implant placement using a computer generated surgical stent fabricated from interactive computer software programs and cone beam computed tomography (CBCT) scan data, without raising soft tissue flap. Preoperative diagnosis and evaluation of the patients was carried out through a combination of clinical and radiographic examination. Clinical examination included intraoral examination of Inter arch space, examination of the ridge shape and volume and preliminary measurements of residual ridge width using Edge Ridge Mapping Caliper. Preoperative orthopatomnograms were used to evaluate Bone height and shape of the edentulous area of the ridge.Fabrications of SGT was done through different steps as following; fabrication of radiopaque template by duplication of the acrylic denture using X-resin material, then all patients were scanned preoperatively using scanora CBCT machine while wearing the RO templates while biting on cotton pellets to ensure maximum compression of soft tissue mucosa, then Segmentation, threshold-processing of CBCT data, virtual implant placement and design of the SGT were done using “Mimics innovation suite 15.0” program, then after finishing the virtual planning the stent was exported as (STL) file format, for rapid prototyping process by fused deposition modeling technique using MOJO desktop machine. Implant placement was performed under local anesthesia, in Minor Surgical clinic; SGT was placed with cotton pellets on the occlusal surface and patient was asked to bite against the opposing teeth or denture, then The SGT was secured in place using mono-cortical screws then Custom made Metal Sleeves were placed in their fitting hubs on the Surgical Guide Template, and Full sequence drillings preformed using custom made drill guide keys until the proper implant diameter was reached, After the drilling process was finished, the fixing screws were unscrewed and the SGT was removed, then the cover screws were placed.Postoperative clinical evaluation of these patients were undertaken on second, fifth, and seventh postoperative day in order to check bleeding, pain, swelling, and infection. Then at one and three months postoperatively, the patients were recalled Four months later for fabrication of final restorations. Postoperative radiographic evaluation of all patients was done through immediately postoperative CBCT scan using scanora machine. DICOM data retrieved from preoperative CBCT scan of each patient was fused with the postoperative DICOM data by “Mimics innovation suite 15.0” program using natural anatomical landmark in order to evaluate and compare the amount of error deviation of the placed implants and 3d generated object of the actual implants then two center points, one coronal and one apical for both preoperative “virtual implants” and 3d generated object of the actual implants were defined for each implant for all patients.Linear deviation at the coronal points and apical points of actual and virtual implants were measured in 3D environment, angular deviation between virtual and actual implants axis were measured in 3D environment, height difference at coronal and apical points of virtual and actual implants were measured in coronal view, anterio-posterior (A-P) displacement at coronal and apical points of virtual and actual implants were measured in sagital view and bucco-lingual (B-L) displacement at coronal and apical points of virtual and actual implants were measured in cross sectional view.The results of this study showed a success rate 100% of osseointegration, the mean linear deviation at coronal end was (1.41 mm) and apical end was (1.89 mm), the mean overall angular deviation was (4.68 degree), the mean overall height difference was (1.49 mm), the mean overall anterio-posterior displacement was (0.73 mm) and the mean overall bucco-lingual displacement was (0.73 mm).