J Adv Prosthodont.  2016 Apr;8(2):85-93. 10.4047/jap.2016.8.2.85.

Finite element analysis on stress distribution of maxillary implant-retained overdentures depending on the Bar attachment design and palatal coverage

• Kim MJ
• Hong SO

• KMID: 2176641
• DOI: http://doi.org/10.4047/jap.2016.8.2.85

Abstract

PURPOSE
The purpose of this study was to determine the effect of anchorage systems and palatal coverage of denture base on load transfer in maxillary implant-retained overdenture.
MATERIALS AND METHODS
Maxillary implant-retained overdentures with 4 implants placed in the anterior region of edentulous maxilla were converted into a 3-D numerical model, and stress distribution patterns in implant supporting bone in the case of unilateral vertical loading on maxillary right first molar were compared with each other depending on various types of anchorage system and palatal coverage extent of denture base using three-dimensional finite element analysis.
RESULTS
In all experimental models, the highest stress was concentrated on the most distal implant and implant supporting bone on loaded side. The stress at the most distal implant-supporting bone was concentrated on the cortical bone. In all anchorage system without palatal coverage of denture base, higher stresses were concentrated on the most distal implant and implant supporting bone on loaded side.
CONCLUSION
It could be suggested that when making maxillary implant retained overdenture, using Hader bar instead of milled bar and full palatal coverage rather than partial palatal coverage are more beneficial in distributing the stress that is applied on implant supporting bone.

Keyword

Dental implants; Complete denture; Overdenture; Attachment; Finite element analysis

MeSH Terms

Dental Implants
Denture Bases
Denture, Complete
Denture, Overlay*
Finite Element Analysis*
Maxilla
Models, Theoretical
Molar
Dental Implants

Figure

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  Fig. 1 Modelling process for the finite element analysis.

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  Fig. 2 3D model and finite element model of maxilla. (A) Divided 3D model (mucosa, cortical bone and trabecular bone), (B) Finite element mesh.

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  Fig. 3 Maxillary overdenture. (A) Full palatal coverage (F), (B) Partial palatal coverage (P).

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  Fig. 4 Finite element model of implant and bar-attachment system. (A) HBC, (B) MBL.

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  Fig. 5 Stress distribution on mucosa. (A) HBC-F, (B) HBC-P, (C) MBL-F, (D) MBL-P.

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  Fig. 6 Stress distribution on bar attachment system. (A) HBC-F, (B) HBC-P, (C) MBL-F, (D) MBL-P.

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