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Technical Briefs

One Versus Two Implant-Retained Dentures: Comparing Biomechanics Under Oblique Mastication Forces

[+] Author and Article Information
Jarosław Żmudzki

Associate Professor

Grzegorz Chladek

Associate Professor
Faculty of Mechanical Engineering,
Silesian University of Technology,
Konarskiego 18a,
Gliwice 44-100, Poland

Jacek Kasperski

Associate Professor
Department of Prosthetic Dentistry,
Medical University of Silesia,
pl. Akademicki 17,
Bytom 41-902, Poland

Leszek A. Dobrzański

Professor
Faculty of Mechanical Engineering,
Silesian University of Technology,
Konarskiego 18a,
Gliwice 44-100, Poland

1Corresponding author.

Contributed by the Bioengineering Division of ASME for publication in the JOURNAL OF BIOMECHANICAL ENGINEERING. Manuscript received October 27, 2012; final manuscript received February 11, 2012; accepted manuscript posted March 8, 2013; published online April 24, 2013. Assoc. Editor: Barclay Morrison.

J Biomech Eng 135(5), 054503 (Apr 24, 2013) (4 pages) Paper No: BIO-12-1520; doi: 10.1115/1.4023985 History: Revised February 11, 2012; Received October 27, 2012; Accepted March 08, 2013

The results from clinical tests of single implant-retained dentures (SIDs) are quite promising. However, the biomechanics of SIDs are still insufficiently determined. The aim of the study was to compare the implant loads and pressures beneath one and two implant-retained dentures (TIDs) under oblique mastication forces. The finite element method was used to conduct a model analysis in order to compare loading of the denture attachment onto the implant that accompanies oblique mastication forces in the cases of SIDs and TIDs. The possibility of a denture detaching and sliding on the mucous membrane surface was simulated. The SID solution faced a more remarkable tilt in the direction of the mastication forces, a higher pressures on the mucous membrane surface, and higher implant loadings. The hingelike restraints in the TID favored utilization of the support in the posterior area. The higher pressure values for the SID can be confusing and could lead to inaccurate conclusions about the acceptability of the SID. In the TID, the same areas of the mucous membrane were persistently loaded, independent of the occlusal force direction. In contrast, in the SID the full freedom of rotational movement enhances alternating use of the mucous membrane. This finding explains the more frequent sores in the mucous membrane beneath the TID than beneath the SID.

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Figures

Grahic Jump Location
Fig. 1

Finite element analysis conditions: model of a denture on an atrophied denture foundation, occlusal forces, and directional constraints RX, RY, and RZ for the calculation of implant loads for SID or TID

Grahic Jump Location
Fig. 2

Loads of attachments and pressures beneath dentures for SID and TID: (a) for the vertical 100 N occlusal force, (b) for the simulated oblique mastication force of 100 N vertical and 100 N horizontal, and (c) for a soft mucous membrane

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