as joining multiple implants by a metal framework considered a solid solution for edentulous arches , but in the same time the conventional method to weld this metal framework to the implants by casting technique in lab usually involves a several disadvantages eg. cost and time consuming in addition to laboratory errors, Thus , this study aims to find another method to weld the metal framework intraorally by an electric welding device
comparing the changes in the soft tissue around the implants that will be joined by a metal framework either with electric welding or with the conventional casting method