Besides a single fracture of a fixation screw, there were no prosthetic complications in patients with ceramic suprastructures. All acrylic restorations showed some extent of abrasion, and veneer fractures occurred in 4 patients (28.6%). The subjective improvement as expressed by the OHIP score was immediate and dramatic, and it showed no group differences. The SFFR showed a gradual increase in both groups, and acrylic-bearing implants showed a substantially and significantly higher flow rate from the third year onward. Bone loss remained under 2 mm after 5 years in all implants and showed no group difference. The initial situation in both groups was largely identical. Endpoints were chosen in accordance with the 2007 Pisa consensus and included bone resorption, the Oral Health Impact Profile (OHIP), the sulcus fluid flow rate (SFFR), and prosthodontic complications. Twenty-seven patients who received immediately loaded All-on-4 fixed mandibular dentures in 2006 were included in the study, and they were evaluated up to 5 years after denture integration. The objective of the present study was to evaluate the comprehensive 5-year results of fixed mandibular dentures fabricated from metal-acrylic or metal-ceramics according to the All-on-4 protocol.
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