J Dent Rehabil Appl Sci.  2015 Sep;31(3):186-194. 10.14368/jdras.2015.31.3.186.

Influence of the length and location of implants on distal extension removable partial dentures: finite element analysis

• Kim JH
• Cho JH
• Lee CH

• KMID: 2180018
• DOI: http://doi.org/10.14368/jdras.2015.31.3.186

Abstract

PURPOSE
To evaluate the effects of implant location and length on stress distribution and displacement in osseointegrated-implants that were associated with mandibular distal extension removable partial dentures (DERPD).
MATERIALS AND METHODS
A sagittally cut model with the #33, #34 teeth and a removable partial denture of the left mandible was used. Seven models were designed with NX 9.0. Models A, B, C had implants with lengths of 11 ,6, 4 mm, respectively, under the denture base of the #37 artificial tooth. Models D, E, F had implants with lengths of 11, 6, 4 mm, respectively, under the denture base of the #36 artificial tooth. Model G did not have any implants. Axial force (250 N) was loaded on #36 central fossa. The finite element analysis was performed with MSC Nastran. Von Mises stress maps were plotted to visualize the results.
RESULTS
The models of #37 implant placement showed much lower stress concentration on the surrounding bone of the implant compared with #36. The #36 implant position tended to reduce displacement more than #37.
CONCLUSION
When an IARPD is designed, the distal positioning of implant placement has more advantages in the edentulous bone of DERPD on the prognosis of short implants and the stress distribution of edentulous alveolar bone. Using implants with longer lengths are important for stress distribution. However, Additional studies are necessary of the effects of length on implant survival.

Keyword

implant-associated removable partial denture; distal extension removable partial denture; implant length; stress distribution

MeSH Terms

Denture Bases
Denture, Partial, Removable*
Finite Element Analysis*
Mandible
Prognosis
Tooth
Tooth, Artificial

Figure

• 

  Fig. 1 Reference points for reading the von-Mises stress and the displacement in 2-dimensional drawing for finite element analysis. (A) model A, B, C, (B) model D, E, F, (C) model G.

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  Fig. 2 von-Mises stress distribution of each model. (A) Model A, (B) Model B, (C) Model C, (D) Model D, (E) Model E, (F) Model F, (G) Model G.

Reference

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