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

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

Inclusion Criteria:

• Ages range from 45 to 65 years old.
• Absence of any medical disorder that could complicate the Surgical phase or affect osseointegration.
• The patients must be completely edentulous.
• The patient must have enough bone height for implants minimum length of 10mm and a minimum diameter of 5 mm.
• Patients with good oral hygiene.
• Complete denture wearer.
• Adequate inter arch space for screw retained prosthesis.
• Absence of any intra-oral pathological condition.

Exclusion Criteria:

• Patients with recent extraction(less than three months).
• Patients with inflamed ridge or candida infection.
• Patients with flappy ridge.
• Parafunctional habits.