title: Long-term survival rates of implants supporting overdentures.
abstract: The study aims were to evaluate survival rates of dental implants in patients wearing maxillary and mandibular overdentures in relation to age, sex, smoking, implant splinting or non-splinting, the maxilla rehabilitated, and number of implants per dental arch. This was a prospective study of patients who were completely edentulous in either mandible or maxilla or both, rehabilitated with implant-retained overdentures, with a follow-up of at least 3 years. 95 patients with 107 overdentures were supported by 360 implants were included in the study. Rehabilitations were monitored over an average of 95 ± 20.3 months (range 36-159). Implant survival in the maxilla was 91.9% and in the mandible 98.6%, representing a statistically significant difference (P < .05). Age, sex and implant splinting did not influence survival rates significantly. Smokers presented a lower survival rate. Implant numbers in the maxilla had a significant influence on survival, 100% for 6 but 85.7% for 4. Three mandibular implants achieved higher survival rates (100%) but with 2 (96.6%) or 4 (99%) survival was lower, although without significant difference. Long-term results suggest that 3-implant mandibular overdentures have an equivalent survival rate to 4-implant overdentures. In the maxilla, results showed that 6 implants may be the best treatment strategy. For smokers with fewer implants retaining the overdentures, there were higher numbers of implant failures.
authors.affiliation: 1  Oral Surgery, Valencia University Medical and Dental School, Valencia, Spain.
authors.forename: José
authors.initials: J
authors.lastname: Balaguer
authors.forename: Javier
authors.initials: J
authors.lastname: Ata-Ali
authors.forename: David
authors.initials: D
authors.lastname: Peñarrocha-Oltra
authors.forename: Berta
authors.initials: B
authors.lastname: García
authors.forename: María
authors.initials: M
authors.lastname: Peñarrocha-Diago
mesh_terms: D015921:Dental Implants; D019094:Dental Prosthesis, Implant-Supported; D003781:Denture Retention; D003828:Denture, Overlay; D005500:Follow-Up Studies; D006801:Humans; D007575:Jaw, Edentulous; D008334:Mandible; D011446:Prospective Studies; D016896:Treatment Outcome
chemical_list: D015921:Dental Implants
keywords: dental implants; denture; edentulous mandible; edentulous maxilla; overdenture; smoking