Immediate Loading of Maxillary Prostheses Using Flapless Surgery, Implant Placement in Predetermined Positions, and Prefabricated Provisional Restorations. Part 2: A Retrospective 10-Year Clinical Study

Purpose: Immediate loading has become a widely reported practice in implant dentistry. The aim of this study is to report on the 10-year clinical and radiographic outcomes of an immediate-loading treatment protocol that included flapless surgery. Materials and Methods: Forty-six patients were treated with 97 immediately loaded Mk IV implants (Nobel Biocare) with machined surface in the maxilla. Presurgically, a three-dimensional model of each patient's soft tissue and underlying alveolar bone anatomy was created and a surgical template was fabricated. A circular mucotome was used to punch out a 5-mm hole in the mucosa to avoid flap elevation. Control examinations were performed on the day of surgery and at 1, 2, 3, 6, 8, and 10 years after surgery. Results: All prepared implant sites had intact buccal and lingual bone walls. The prefabricated provisional restorations showed excellent fit. Nine implants failed within 8 weeks of loading, resulting in a cumulative survival rate of 91% after 10 years of loading. The survival rates were 94% for implants supporting partial prostheses and 81% for implants supporting single restorations. Average marginal bone resorption was 1 mm during the first year, 0.4 mm during the second year, and 0.1 mm during the third year and after 10 years. Conclusions: The unchanged survival rate and the low average bone loss after 10 years confirm the feasibility of an immediate loading treatment protocol in the maxilla that included flapless surgery. Palabras clave: dental implants, flapless surgery, immediate loading, machined surfaces, poor bone quality