インプラントにおける磁性アタッチメントの応用

―第2報 キャップ式磁性アタッチメント（MACS）による可撤式クラウンブリッジおよび印象採得への応用―

抄録

Magnets can retain objects with their magnetic force, and have various characteristics that are different from conventional mechanical retainers. They are drawing much attention as improved denture retainers. Furthermore, several problems such as adverse effects during magnetic resonance imaging and deterioration of the retainer (prepared by casting and treated with acids) remain. To resolve these problems and to expand the advantages and use of the magnets, a new magnet system called a magnetic attachment Magnetic Attachments of a Cap Shape (MACS) is being developed. This reports on the application of the MACS to removable crown-bridges and impression taking procedure for implant treatment mainly.
The MACS is composed of the male(positive)portion which is attached to the anchor (natural tooth or implant) and the female (negative) portion which is attached to the prosthetic appliance. The male portion is equipped with a screw or other device which is used to attach it to the anchor and it has a head which mates with the female portion. The female portion has a cap which covers the male portion. When used for removable crown bridges,the MACS makes it easy to prepare the bridge and resolve conventional problems such as loosened screws, difficulties in making a passive-fit super structure, and aesthetically unsatisfactory access holes. When used for impression making procedure, the MACS allows precise impressions to be taken easily, and can be used even in cases where the mouth opening is too small and even at sites where screws are difficult to reach (e. g., molars), thus resolving the problem of complex manipulations required by the open tray method.