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Odontology

, Volume 103, Issue 3, pp 333–338 | Cite as

Structural stability of posterior retainer design for resin-bonded prostheses: a 3D finite element study

  • Jie Lin
  • Zhiqiang Zheng
  • Akikazu Shinya
  • Jukka Pekka Matinlinna
  • Michael George Botelho
  • Akiyoshi Shinya
Original Article

Abstract

The purpose of this in vitro study was to compare the stress distribution and natural frequency of different shape and thickness retainer designs for maxillary posterior resin-bonded prostheses using finite element (FE) method. A 3D FE model of a three unit posterior resin-bonded prosthesis analysis model was generated. Three different shaped retainer designs, viz. C-shaped (three axial surface wraparounds), D-shaped (three axial surface wraparounds with central groove) and O-shaped (360° wraparounds), and three different thicknesses, viz., 0.4, 0.8, and 1.2 mm, resin-bonded prostheses were used in this study. The resin-bonded prosthesis analysis model was imported into an FE analysis software (ANSYS 10.0, ANSYS, USA) and attribution of material properties. The nodes at the bottom surface of the roots were assigned fixed zero displacement in the three spatial dimensions. A simulated angle of 45° loading of a 100 N force was applied to the node of the pontic lingual cusp surface. The stress distributions and corresponding natural frequencies were analyzed and resolved. The C-shaped retainer for 0.4 mm thickness recorded the greatest von Mises stresses of 71.4 MPa for all three groups. C-shaped, D-shaped and O-shaped retainer presented natural frequencies 3,988, 7,754, and 10,494 Hz, respectively. D-shaped retainer and O-shaped retainer increased natural frequencies and structural rigidity over the traditional C-shaped retainer. The maximum von Mises stresses values of the remaining tooth and prosthesis decreased with greater retainer thickness. D-shaped retainer and O-shaped retainer increased natural frequencies and structural rigidity over the traditional C-shaped retainer.

Keywords

Resin-bonded prosthesis Finite element analysis Natural frequency Retainer design 

Notes

Conflict of interest

The authors declare that there is no conflict of interests regarding the publication of this article.

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Copyright information

© The Society of The Nippon Dental University 2014

Authors and Affiliations

  • Jie Lin
    • 1
    • 2
  • Zhiqiang Zheng
    • 1
  • Akikazu Shinya
    • 2
  • Jukka Pekka Matinlinna
    • 3
  • Michael George Botelho
    • 4
  • Akiyoshi Shinya
    • 2
  1. 1.Department of VIP Dental Service, School and Hospital of StomatologyFujian Medical UniversityFuzhouPeople’s Republic of China
  2. 2.Department of Crown and BridgeThe Nippon Dental University School of Life Dentistry at TokyoTokyoJapan
  3. 3.Dental Materials Science, Faculty of Dentistry, Prince Philip Dental HospitalThe University of Hong KongPok Fu LamPeople’s Republic of China
  4. 4.Oral Rehabilitation, Faculty of Dentistry, Prince Philip Dental HospitalThe University of Hong KongPok Fu LamPeople’s Republic of China

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