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Towards developing CAD/CAM solutions in the retention of extra-oral facial prosthetics

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thesis
posted on 04.08.2022, 11:52 authored by Steffan John Rhys Daniel

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   butlittle research   has considered   producing these elementsusing  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 practiceand obtaining  the opinions  of  practicing  clinicians. Secondly,  the qualitative findings are applied to develop a fully CAD/CAMprocess 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 offit 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  theprosthesis  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.  

History

School

School of Art and Design

Qualification level

Doctoral

Qualification name

PhD

Publication Year

2014

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