Finite element analysis on preferable I-bar clasp shape.

Abstract:

:An I-bar clasp is one of the most popular direct retainers for distal-extension removable partial dentures. However, no adequate information is available on preferable shape as determined by biomechanics. This study aimed (1) to investigate, by finite element analysis (FEA), the dimensions and stress of I-bar clasps having the same stiffness, and (2) to estimate a mechanically preferable clasp design. Three-dimensional FEA models of I-bar clasps were created with vertical and horizontal straight sections connected by a curved section characterized by six parameters: thickness of the clasp tip, width of the clasp tip, radius of the curvature, horizontal distance between the base and the vertical axis, vertical dimension between the tip and the horizontal axis, and taper (change of width per unit length along the axis). Stress was calculated with a concentrated load of 5 N applied 2 mm from the tip of the clasp in the buccal direction. A thinner and wider clasp having an taper of 0.020-0.023 and radius of curvature of 2.75-3.00 showed less stress. The results suggest that such a shape might be the preferable I-bar clasp shape as biomechanical viewpoint.

journal_name

J Oral Rehabil

authors

Sato Y,Tsuga K,Abe Y,Asahara S,Akagawa Y

doi

10.1046/j.1365-2842.2001.00673.x

keywords:

subject

Has Abstract

pub_date

2001-05-01 00:00:00

pages

413-7

issue

5

eissn

0305-182X

issn

1365-2842

pii

jor673

journal_volume

28

pub_type

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