Magnetic retention and bar-clip attachment for implant-retained auricular prostheses: a comparative analysis.
Retention systems for implant-retained auricular prostheses using either bar-clip attachments with 2 or 3 clips or retention with 2 or 3 magnets were wear tested (insertion and removal cycles) to simulate clinical periods of use. Measurements were taken at intervals of 540 cycles, which represents a period of use of approximately 6 months, for up to 3,240 cycles. Assessments of retentive force were carried out before, during, and after the wear test. Statistical analysis indicated that the bar-clip systems provided higher retention than the magnetic systems. The bar-clip attachment with 2 clips showed a significant loss of retentive force after wear testing (P < .05), suggesting lower durability and shorter clinical life. The retention provided by the bar-clip attachment with 3 clips remained stronger than that provided by all other systems tested. At the end of the wear test, the magnetic systems showed very little loss of retention but were still less retentive than the bar-clip systems, suggesting higher durability under clinical simulation despite the lower retention initially provided.
Department of Maxillofacial Surgery, Prosthesis and Traumatology, School of Dentistry, University of São Paulo, Brazil.
Andréa Alves
AA
de Sousa
Beatriz Silva Câmara
BS
Mattos
D004431:Ear, External; D006801:Humans; D008280:Magnetics; D019736:Prostheses and Implants; D011474:Prosthesis Design; D011475:Prosthesis Failure; D019919:Prosthesis Implantation; D013314:Stress, Mechanical; D013499:Surface Properties; D013718:Tensile Strength