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Characterising the mould rectification process for designing scoliosis braces: towards automated digital design of 3D-printed braces

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Title: Characterising the mould rectification process for designing scoliosis braces: towards automated digital design of 3D-printed braces
Authors: Sanz-Pena, I
Arachchi, S
Halwala-Vithanage, D
Mallikarachchi, S
Kirumbara-Liyanage, J
McGregor, A
Silva, P
Newell, N
Item Type: Journal Article
Abstract: The plaster-casting method to create a scoliosis brace consists of mould generation and rectification to obtain the desired orthosis geometry. Alternative methods entail the use of 3D scanning and CAD/CAM. However, both manual and digital design entirely rely on the orthotist expertise. Characterisation of the rectification process is needed to ensure that digital designs are as efficient as plaster-cast designs. Three-dimensional scans of five patients, pre-, and post-rectification plaster moulds were obtained using a Structure Mark II scanner. Anatomical landmark positions, transverse section centroids, and 3D surface deviation analyses were performed to characterise the rectification process. The rectification process was characterised using two parameters. First, trends in the external contours of the rectified moulds were found, resulting in lateral tilt angles of 81 ± 3.8° and 83.3 ± 2.6° on the convex and concave side, respectively. Second, a rectification ratio at the iliac crest (0.23 ± 0.04 and 0.11 ± 0.02 on the convex and concave side, respectively) was devised, based on the pelvis width to estimate the volume to be removed. This study demonstrates that steps of the manual rectification process can be characterised. Results from this study can be fed into software to perform automatic digital rectification.
Issue Date: 19-May-2021
Date of Acceptance: 18-May-2021
URI: http://hdl.handle.net/10044/1/88913
DOI: 10.3390/app11104665
ISSN: 2076-3417
Publisher: MDPI AG
Start Page: 1
End Page: 13
Journal / Book Title: Applied Sciences
Volume: 11
Issue: 10
Copyright Statement: © 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
Publication Status: Published
Online Publication Date: 2021-05-19
Appears in Collections:Mechanical Engineering
Department of Surgery and Cancer
Faculty of Medicine

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