Quality of alveolar bone - Structure-dependent material properties and design of a novel measurement technique

Winter, W., Krafft, T., Steinmann, P. and Karl, M. (2011) Quality of alveolar bone - Structure-dependent material properties and design of a novel measurement technique. Journal of the Mechanical Behavior of Biomedical Materials, 4(4), pp. 541-548. (doi: 10.1016/j.jmbbm.2010.12.014)

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Abstract

The evidence for the efficiency of clinical methods used to assess the quality of alveolar bone in terms of a density measure prior to and during dental implant surgery is limited. The aim of this paper is to describe the biomechanical background which can be used as a basis for determining the bone quality by measuring the elastic properties of the bone and to design a novel device for the determination of the bone quality during dental implant surgery.Applying material mechanical equations for porous and cellular structured models, the elastic material properties (modulus of elasticity) of cellular and cortical bone as porous structures were approximated over the whole range of relative bone mineral density of trabecular and cortical bone. Based on a circular disc with a central hole reflecting a horizontal cross-section of an implant socket, the mechanical effects of expanding the central hole were studied. Subsequently, the clinical situation of a socket prepared for the placement of a dental implant (depth: 10 mm; diameter 3.5 mm) was simulated using three-dimensional (3D) finite element analysis. A loading device (thickness: 3.5 mm) was placed in the trabecular part of the socket and expanded, while the resulting pressure was recorded and used for the calculation of an elastic modulus. Finite element analysis revealed that it was possible to estimate the bone quality by applying the measurement technique proposed. Maximum deviations of 6% of the experimentally determined elastic modulus from the setpoint elastic modulus were found.Measuring the internal pressure in a drill hole, e.g., in an implant socket caused by a defined expansion of a rotational symmetric loading device, could be used for establishing a clinically meaningful test system for the objective classification of alveolar bone.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Steinmann, Professor Paul
Authors: Winter, W., Krafft, T., Steinmann, P., and Karl, M.
College/School:College of Science and Engineering > School of Engineering > Infrastructure and Environment
Journal Name:Journal of the Mechanical Behavior of Biomedical Materials
Publisher:Elsevier
ISSN:1751-6161
ISSN (Online):1878-0180
Published Online:25 December 2010
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