Experimental analysis of retention forces of different magnetic devices for bone-anchored auricular facial prostheses

Abstract The aim of this study was to determine which combination of differently designed magnetic abutments provides the best retention for an auricular prosthesis. The withdrawal forces of eight combinations of abutments were measured and results compared. There was a significantly higher withdraw...

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Bibliographic Details
Published in:International journal of oral and maxillofacial surgery 2008-07, Vol.37 (7), p.664-668
Main Authors: Voigt, A, Christ, S, Klein, M
Format: Article
Language:English
Subjects:
auricular facial prosthesis
Biological and medical sciences
Cobalt - chemistry
Dentistry
draw-off force
Ear, External
Humans
magnetic abutment
Magnetics - instrumentation
Medical sciences
Orthopedic surgery
Otorhinolaryngology. Stomatology
Polymethyl Methacrylate - chemistry
Prostheses and Implants
Prosthesis Design
Prosthesis Failure
Prosthesis Implantation
retention
Samarium - chemistry
Silicones - chemistry
Stress, Mechanical
Surface Properties
Surgery
Surgery (general aspects). Transplantations, organ and tissue grafts. Graft diseases
Titanium - chemistry
Welding
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Summary:Abstract The aim of this study was to determine which combination of differently designed magnetic abutments provides the best retention for an auricular prosthesis. The withdrawal forces of eight combinations of abutments were measured and results compared. There was a significantly higher withdrawal force in arrangements containing three magnets over only two. The highest withdrawal force was found in the combination of one telescopic magnet and two large spherical magnets (median: 7.69 N), whereas two telescopic magnets alone showed the lowest withdrawal force (3.41 N). The use of two conical magnets increased retention slightly, but the median retention force remained the same (3.41 N). The commonly used combination of two small spherical magnets and one telescopic magnet showed the lowest retention of combinations consisting of three magnets (4.94 N). There seems to be no difference in median withdrawal force if a conical magnet instead of a telescopic magnet is used. The withdrawal force at a 45° angle was about 10% higher than the vertical force but the difference was not significant. The rupture force needed to tear the magnet completely out of the silicone was 240.6–519.7 N (mean 331.74 N) and therefore over 10 times higher than magnetic retention.
ISSN:0901-5027
1399-0020
DOI:10.1016/j.ijom.2008.02.010