• Institution: LOCKSS

Effects of Mucosal Thickness on the Stress Distribution and Denture Stability of Mandibular Implant-Supported Overdentures with Unsplinted Attachments In Vitro

  1. Asuka Haruta1
  2. Yasuyuki Matsushita1
  3. Yoshihiro Tsukiyama1
  4. Yoshinori Sawae2
  5. Nobuo Sakai2
  6. Kiyoshi Koyano1
  1. 1Division of Oral Rehabilitation, Faculty of Dental Science, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan
  2. 2Department of Intelligent Machinery and Systems, Faculty of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
  1. Asuka Haruta, aharuta{at}dent.kyushu-u.ac.jp


The aim of this study was to compare the effects of mucosal thickness on the stress pattern around implants and movement of implant-supported overdentures with ball/female and three different types of magnetic attachments. After insertion of two root-form implants into a mandibular model, the surface of the model was covered with a 1.5- or 3-mm layer of impression material to simulate the oral mucosa, and removable overdentures were fabricated on each model. A 50-N vertical force was applied to the right first molar, and the resultant stress distribution and denture movement were measured. In the 1.5-mm mucosal model, the magnetic attachments showed significantly lower bending moments than did the ball attachment. The denture base displacement was the lowest on a magnetic attachment. In this study, use of magnetic attachments could be advantageous for mandibular implant-supported overdentures based on lower stress and better denture stability especially in the thin mucosal model.

  • Received December 9, 2010.
  • Revision received March 1, 2011.
  • Accepted March 15, 2011.

This Article

  1. J Dent Biomech vol. 2 no. 1 894395
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