compare fully versus partially guided all on four implants placement immediately loaded by maxillary and mandibular screw retained overdentures: A radiographic and photogrammetric measurement of accuracy of implant position and passivity of superstructures.
The measurements will be done as follows:
1. Photogrammetric scan immediately after implant instalments to measure 3D accuracy of implant position and Passivity of super structure
2. Cone beam X ray to measure the implant marginal bone height changes.
3. Implant marginal soft tissue evaluations including pocket probing depth, plaque and gingival indices. Evaluation will be done immediately, one and two years after loading.