Towards developing CAD/CAM solutions in the retention of extra-oral facial prosthetics
Daniel, Steffan John Rhys
Cardiff Metropolitan University
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In the production of removable facial prosthetics, Computer-Aided Design and Manufacture (CAD/CAM) is being increasingly explored. This PhD thesis investigates the application of CAD/CAM in the design and production of components that retain the prostheses to the anatomy. Conventional methods of hand-crafting the retention elements are well established but little research has considered producing these elements using CAD/CAM. A fully digital prosthetic workflow has not yet been developed, and the efficacy of using CAD/CAM for retention mechanism design and fabrication remains unclear. This study firstly focuses on defining the requirements for designing extra-oral prosthesis retention mechanisms, by mapping the various stages of conventional practice and obtaining the opinions of practicing clinicians. Secondly, the qualitative findings are applied to develop a fully CAD/CAM process using existing technologies. Scanning, reverse engineering, design and fabrication technologies are trialled and samples of bar-clip mechanisms are produced. The final stage focuses on developing objective methods to evaluate aspects of bar-clip design previously limited to subjective evaluation, and to make an initial comparison of conventional and CAD/CAM bar-clip mechanisms. This focuses on measuring surface and dimensional quality, accuracy of fit and clip retention forces. This study provides an increased knowledge-base of current prosthetic practice; CAD/CAM prosthesis production and evaluation methods; and insight into the attitudes of clinicians towards the integration & implementation of CAD/CAM. The thesis demonstrates that CAD/CAM can be used to design, produce, and integrate bar-clip retention mechanisms in all aspects of the prosthesis production workflow. Digital measurement methods allow an objective evaluation of the important aspects of bar-clip mechanism design, identifying a number of inaccuracies/design flaws that current evaluation techniques fail to identify. The study concludes that the overall CAD/CAM workflow is not yet appropriate for clinical practice but there is potential in the newly developed processes and this drives future work.
Showing items related by title, author, subject and abstract.
Daniel, Steffan; Eggbeer, Dominic (Emerald, 2016)Purpose – This paper aims to present novel techniques for designing maxillofacial prostheses using computer-aided design (CAD) and additive manufacture (AM), focusing on the integration of osseointegrated retention ...
Eggbeer, Dominic; Bibb, Richard; Evans, P. (Matrix Marketing, 2006-12-01)Previous research into the application of digital technologies in maxillofacial prosthetics has focussed on the creation of overall shape, but very little research had explored the incorporation of implant retention ...
Eggbeer, Dominic; Bibb, Richard; Evans, P. (Matrix Marketing, 2007)Purpose – Maxillofacial Prosthetics is faced with increasing patient numbers and cost constraints leading to the need to explore whether computer-aided techniques can increase efficiency. This need was addressed through ...