title: An up to 7-Year Retrospective Analysis of Biologic and Technical Complication With the All-on-4 Concept.
abstract: The aim of this study was to evaluate retrospectively biologic and technical complications as well as clinical and radiographic outcomes of patients treated with 4 implants according to the All-on-4 protocol and followed up to 7 years of function. Data from 56 consecutive patients presenting complete edentulous jaw, aged 18 years or older, treated between January 2008 and December 2013, were evaluated. The outcomes were implant and prosthetic survival and success rates, any complications, and marginal bone loss (MBL). Two-hundred twenty-four implants were placed in 56 patients. During the entire follow-up, 1 maxillary implant but no prosthesis failed during the healing process. Fourteen patients experienced 1 complication each (10 technical, 4 biologic). The overall implant and prosthetic success rate was 98.2% and 82.1%, respectively. All complications were considered as minor and successfully resolved chairside. A mean MBL of 1.30 ± 0.63 mm was observed at the last follow-up. Statistically significant difference was found for postextractive implants (0.79 ± 0.26) vs implants placed in healed sites (1.03 ± 0.46; P = 0.024). Within the limits of the present study, the All-on-4 concept may be a valuable surgical and prosthetic option for the treatment of complete edentulous jaws. However, minor technical and biologic complications can occur. Further long-term prospective data with primary outcomes focused on success rates are needed.
authors.affiliation: 1   Private practice, Rome, Italy.
authors.forename: Marco
authors.initials: M
authors.lastname: Tallarico
authors.affiliation: 1   Private practice, Rome, Italy.
authors.forename: Luigi
authors.initials: L
authors.lastname: Canullo
authors.affiliation: 2   Private practice, Sassari, Italy.
authors.forename: Milena
authors.initials: M
authors.lastname: Pisano
authors.affiliation: 3   Faculty of Medicine and Dentistry. University of Valencia, Valencia, Spain.
authors.forename: David
authors.initials: D
authors.lastname: Peñarrocha-Oltra
authors.affiliation: 3   Faculty of Medicine and Dentistry. University of Valencia, Valencia, Spain.
authors.forename: Miguel
authors.initials: M
authors.lastname: Peñarrocha-Diago
authors.affiliation: 4   Dentistry Unit, University Hospital of Sassari, Italy.
authors.forename: Silvio Mario
authors.initials: SM
authors.lastname: Meloni
mesh_terms: D000328:Adult; D000368:Aged; D016301:Alveolar Bone Loss; D001688:Biological Products; D015921:Dental Implants; D019094:Dental Prosthesis, Implant-Supported; D019232:Dental Restoration Failure; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007575:Jaw, Edentulous; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D012189:Retrospective Studies; D016896:Treatment Outcome
chemical_list: D001688:Biological Products; D015921:Dental Implants
keywords: All-on-4; complete edentulism; complete-arch prosthesis; dental implants; implant complications; tilted implants