This study aims to compare two different prosthetic systems used in mandibular full-arch implant-supported fixed prostheses (All-on-4). The study evaluates patient satisfaction and prosthetic complications associated with the OT-Bridge system versus multiunit abutments.

A total of 20 patients will be included and divided into two equal groups. All patients will receive implant-supported screw-retained fixed prostheses.

Clinical and prosthetic outcomes will be assessed at baseline (T0), 6 months (T6), and 12 months (T12), including evaluation of patient satisfaction and any prosthetic complications.

The findings of this study may help improve the selection of prosthetic systems to enhance clinical outcomes and patient quality of life.

Inclusion Criteria:

• Adult patients (≥18 years) with edentulous mandible.
• Patients receiving or having received All-on-4 dental implants in the mandible.
• Adequate implant stability to support prosthetic loading.
• Patients indicated for screw-retained full-arch fixed prostheses using either OT-Bridge system or multiunit abutments.
• Patients willing to participate and attend follow-up visits at T0, T6, and T12 months.

Exclusion Criteria:

• Patients with uncontrolled systemic conditions affecting healing (e.g., uncontrolled diabetes).
• Patients with failed or mobile implants.
• Severe parafunctional habits (e.g., uncontrolled bruxism).
• Poor oral hygiene compliance.
• Patients unable to attend follow-up visits