#5 Measurement of magnetic keeper coping wax patterns fabricated from working cast with artificial gum
S. Okano1, E. Nagai11,2, K. Ohtani1,2, Y. Umekawa1,2, Y. Fukase3, T. Uchida1, M. Kiuchi1, N. Tsukimura1,2, T. Ishigami1,2
1 Department of Partial Denture Prosthodontics, Nihon University School of Dentistry 2 Division of Clinical Research, Dental Research Center, Nihon University School of Dentistry 3 Department of　Dental　Materials Division of Biomaterials Science, Nihon University School of Dentistry
Recently, magnetic attachment has been used in prosthodontic treatments due to improve masticatory stability. The purpose of this study was to investigate the type of tooth with magnetic keeper coping, and measure the wax pattern made on working cast with artificial gum to select the keeper size. Samples were prepared 100 working casts with artificial gum and making coping wax pattern, and then taken CT images with Microfocus X-ray CT system (Shimadzu Corporation) respectively. CT images were using image analysis software CT-Solver (Shimadzu Corporation) to measure the length of post and diameter of root surface of the wax pattern. Then size of keeper tray was decided on mesiodistal-diameter measurements of the wax pattern. Based upon the results of this study; 1. Applied abutment tooth of the magnetic keeper coping were upper canine teeth. 2. The length of post- wax pattern was approximately 4 to 6 mm. 3. There is a possibility that magnetic keeper of suitable size was selected reference to cross-section of remaining root.