Chair:  Masayuki Hideshima (Tokyo Medical and Dental University)

poster discussion


 Fixation of modified magnet assembly to denture base using alternative resins.

S. Okayama, H. Shimpo, Y. Suzuki, C. Ohkubo

Department of Removable Prosthodontics, Tsurumi University School of Dental Medicine




Special care must be taken during the fixation of magnetic assembly because the denture may become impossible to remove from the abutment teeth or implant due to the PMMA resin’s hardening within the undercut around the keeper. The aim of this study has been to investigate the fixation strengths of magnetic assemblies to denture bases using alternative resins similar to conventional resin.

Materials and Method:

Magnetic assemblies with three different undercuts and three resins as fixation materials to magnetic assembly were prepared in this study. Tensile testing was performed to evaluate the fixation strength and the attractive force of magnetic assembly using resins after repeated insertion/removal testing. The data of fixation strengths and attractive force were analyzed using a two-way ANOVA, Tukey’s multiple comparison and t-test (α=0.05).

Results and Discussion:

By adding undercut wings to the magnetic assembly, fixation strengths tended to be increased when temporary fixation materials were used. Temporary filling resin and conventional PMMA resin demonstrate a constant attractive force without removing the magnetic assembly. Temporary filling resin showed comparable fixation strengths to conventional resin.