Chair:  Masayuki Hideshima (Tokyo Medical and Dental University)

poster discussion


 Denture base strength influence of its thickness surrounding magnetic assembly

-Examination by the model experiments-

T. Kanazawa1, Y. Umekawa1,2, T. Ishii1, A. Tateno1

E. Nagai1,2, K. Ohtani1,2, K. Suda1 and T. Ishigami1,2

1Department of Partial Denture Prosthodontics, Nihon University School of Dentistry

2Division of Clinical Research, Dental Research Center, Nihon University School of Dentistry



During long-term use of a magnetic overdenture often requires repair of the resin denture base on the coping due to fracture. Which may result in thin denture base surrounding the magnetic assembly, and the magnetic assembly works as a fulcrum or supporting point. Therefore, we evaluate the denture base strength influence of its thickness surrounding magnetic assembly.

The specimens made of heat curing resin which were two types of coping model (cone and spherical) were evaluated. Then each of coping models were institute its thickness to 2.5, 3.0 and 3.5 mm. The bending strength of three and four point bending of the specimens were measured at a crosshead speed of 5 mm/min in a universal testing machine.

There were significant difference in the thickness of specimens and there were not significant deference in the coping shape.

 This result indicates that improvement of the denture base need resin thickness surrounding magnetic assembly.