RESUMO
This pilot study was designed to collect initial data on overdenture attachment retention in varying configurations of attachment location in an implant-retained mandibular overdenture. A clear acrylic model of a mandible with 6 numbered implants and Locator resilient abutments was used to simulate implant placement in a patient. A clear acrylic denture was fabricated with 6 Locator housings to match the implants in the model. Attachments were tested in 4 different configurations: 2 implants, 2 and 5 (T25); 4 implants, 2-5 (T2345); 4 implants, 1, 3, 4, and 6 (T1346); and 6 implants, 1-6 (T1-6). Clear nylon male inserts were used for each test. The mean overall retentive strength across all 20 pulls was 576.0 N for configuration T1-6, 354.9 N for configuration T1346, 350.7 N for configuration T2345, and 189.9 N for configuration T25. Mean retentive strength also stabilized after the 7th pull for all 4 configurations, resulting in nonsignificant declines in retentive strength within each specific configuration after 7 pulls. Configuration T1-6 exhibited the greatest retentive strength relative to all other configurations both initially and after repeated application of force. Configurations T1346 and T2345 had similar retentive strengths, and both had greater retentive strength than T25. However, despite these differences, all 4 configurations exhibited similar losses in retentive strength from the repeated application of force during the first 7 pulls until stabilization occurred shortly thereafter.
Assuntos
Prótese Dentária Fixada por Implante , Retenção de Dentadura , Revestimento de Dentadura/efeitos adversos , Prótese Dentária Fixada por Implante/efeitos adversos , Prótese Dentária Fixada por Implante/métodos , Análise do Estresse Dentário , Planejamento de Dentadura , Retenção de Dentadura/métodos , Humanos , Modelos Dentários , Projetos PilotoRESUMO
This study evaluated the shear bond strength (SBS) of 4 different retentive materials for the chairside pickup of dental implant attachments. Shear force was applied to determine the SBS of each material to denture acrylic resin. The difference between SBSs of polymethyl methacrylate and UBAR (claimed to bond to metal) to metal housings was also evaluated. There were no statistically significant differences among the SBSs of Jet Denture Repair Acrylic, EZ PickUp, and UBAR, but Quick Up had an SBS that was significantly lower than that of the other 3 materials. In addition, UBAR had a higher SBS to metal housings than did processed polymethyl methacrylate.