The influence of data shape acquisition process and geometric accuracy of the mandible for numerical simulation

Abstract

Computer-aided technologies have allowed new 3D modelling capabilities and engineering analyses based on experimental and numerical simulation. It has enormous potential for product development, such as biomedical instrumentation and implants. However, due to the complex shapes of anatomical structures, the accuracy of these technologies plays an important key role for adequate and accurate finite element analysis (FEA). The objective of this study was to determine the influence of the geometry variability between two digital models of a human model of the mandible. Two different shape acquisition techniques, CT scan and 3D laser scan, were assessed. A total of 130 points were controlled and the deviations between the measured points of the physical and 3D virtual models were assessed. The results of the FEA study showed a relative difference of 20% for the maximum displacement and 10% for the maximum strain between the two geometries.

A numerical study on the influence of CT scan orientation for mandible biomechanical simulation

“…Model I presented higher peaks in most locations. In fact, the geometry influenced strain distribution which is in agreement with previous studies (Relvas et al 2010 of the jaw, making it more or less sensitive to strain in these areas (Figure 2). …”

“…By reassembling all the scanned slices, a 3D Computer-Aided Design (CAD) model can be generated (Ichim et al 2007). There will inevitably be a degree of information loss when using this process, depending on the resolution used for the CT scans (Relvas et al 2010). This loss of information can be a source of change in the behaviour of the computational model resulting in deviations in relation to the real physical problem being simulated.…”

“…It may be necessary to simplify a highly complex problem in order to save computational time or due to geometric variations resulting from the process used for data shape acquisition (Relvas et al 2010). One of the most common processes used to obtain data about bone geometry and mechanical properties is computer tomography (CT) scanning (Tie et al 2006).…”

Three-dimensional laser scanning: potential uses for museum conservation and scientific research

“…Furthermore, published manuscripts that discuss and utilize 3D laser scanners in the study are typically aimed at specialists in the field of paleoanthropology, medicine, biology, and forensic science; the studies tend to focus more on sophisticated methods that are used to analyze 3D scans, such as finite element analysis, geometric morphometrics, and elliptical Fourier techniques (e.g. Friess, 2010;Garvin and Ruff, 2012;Hennessey et al, 2002;Relvas et al, 2011;Sholts et al, 2011). These technical papers can be difficult for the novice user to follow.…”

Evolución Humana Y Antropología Virtual: Una Propuesta Para La Docencia Y La Investigación

“…Con la generalización de los escáneres (especialmente en cuanto al precio de los dispositivos), la digitalización de homininos fósiles y actuales y materiales osteológicos faunísticos ha sido ampliamente utilizado (Dawson and Levy, 2005;Hennersy and Stringer, 2002;Kappelmann et al, 2000Kappelmann et al, , 2001Larson et al, 2009;Lyons et al, 2000;Motani, 2005;Pfisterer et al, 2007Pfisterer et al, , 2008Plyusnin et al, 2008;Smith and Strait, 2008;Strait and Smith, 2009). En el ámbito de la investigación los modelos digitales están generalizándose en los análisis de elementos finitos, la anatomía comparada, la morfometría geométrica y las técnicas elípticas de Fourier (Friess, 2010;Garvin & Ruff, 2012;Hennesey et al, 2002;Relvas et al, 2011;Sholts et al, 2011;. Como alternativa de almacenamiento, catalogación y preservación, el registro digital de material óseo puede suponer una implementación en la conservación de estos frágiles restos en Museos y otras instituciones (Kuzminsky & Gardiner, 2012).…”