The main advantage of converting a complete denture to a screw-retained implant-supported prosthesis is:

Correct answer: A. Reduction of mucosal load and pressure

• A. A key advantage of converting a complete denture to a screw-retained implant-supported prosthesis is that the masticatory forces are transmitted through the implants to the bone — REDUCING (or eliminating) the load on the mucosa. This decreases pain, soreness, and pressure-related mucosal pathology. ✓
• B. While implants slow bone resorption significantly, they do not completely eliminate it — particularly in the areas away from the implants.
• C. Esthetics improvement is patient-dependent and not guaranteed to be better than a well-made conventional denture.
• D. Implant prostheses require regular maintenance, implant cleaning, and component inspection.