Patient Satisfaction and Prosthetic Complications of the Milled Bar Versus Screw-Retained Prostheses for Maxillary Subperiosteal Implants: A One Year Randomized Clinical Trial

Patients enrolled in this randomized clinical trial will undergo surgical placement of maxillary subperiosteal implants. Following the healing period, patients will be allocated into two treatment groups. Group 1 will receive a milled bar-retained prosthesis, while Group 2 will receive a screw-retained prosthesis. Baseline data and clinical parameters will be recorded. Throughout the one-year follow-up period, patient satisfaction will be evaluated using standardized questionnaires or visual analog scales (VAS). Additionally, prosthetic complications-such as screw loosening, fracture, or bar-related issues-will be closely monitored and documented at regular follow-up intervals to comprehensively compare the two restorative modalities.

Inclusion criteria

• Severe atrophied maxillary ridge (Residual bone height < 4mm on CBCT) with the presence of adequate bone volume in the maxilla to support subperiosteal implants.
• Willing to attend quarterly follow-ups.
• No previous subperiosteal implant history.

Exclusion criteria

• Systemic conditions contraindicating implant therapy.
• Poor oral hygiene or ongoing periodontal disease.
• Patients who have received hybrid restorations (i.e., a combination of bar and multi-unit systems).