#4 Influence of Cast Magnetic Alloy Keeper Thickness on the Attractive Force of a Magnetic Attachment
Iwai T., Nakamura Y., Shoji K., Masuda T., Kanbara R., Miyata T., Sakane M., Ohno Y., Tanaka Y．
Removable Prosthodontics, School of Dentistry, Aichi-Gakuin University
Magnetic attachments which have multiple features such as small size, a stable retentive force, and an improved operability, have become widely available thanks to the clinically-based research. The conventional magnetic attachment consists of a magnetic assembly and a keeper. Using a conventional magnetic attachment often involves some difficulty in designing the prostheses due to the restrictive flexibility of the keeper. Attract P (Panasonic dental Co.) is the only commercially available moldable magnetic alloy that attaches to a magnet. The use of Attract P for the fabrication of a keeper may allow the expansion of magnetic attachment application. However, few studies are available in the literature on the mechanical properties of Attract P. The basic data of Attract P is required to use this alloy for the extensive variety of prosthetic designs. 　In the present study, we fabricated keeper prototypes with the same planer morphology as GIGAUSS C 600 and with a thickness between 0.2 mm and 1.8 mm using Attract P. The attractive force of the keeper prototype and magnetic assembly was measured, and compared with that of a GIGAUSS C 600 keeper.