University of Twente Student Theses


Computer-aided design and manufacturing of personalized nasal prostheses after rhinectomy. Fabrication and evaluation of nasal prostheses created with a semi-automated workflow

Ridder, M. de (2022) Computer-aided design and manufacturing of personalized nasal prostheses after rhinectomy. Fabrication and evaluation of nasal prostheses created with a semi-automated workflow.

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Abstract:Rationale: Patients that have undergone a total rhinectomy experience a significant decrease in quality of life. A nasal prosthesis serves as a possible solution for facial deformities and can increase a patients quality of life. However, the current workflow of the anaplastologist for the creation of nasal prostheses is complex, skill-dependent and therefore time-consuming. An innovative workflow which overcomes these drawbacks and additionally allows patients to express their preferences, is desired. Method: Rhinectomy patients were asked to digitally create their ideal nose shape in 3D, as visualized on their own 3D face scan. In addition, they were asked to fill out the Face-Q questionnaire about their conventional prosthesis. Healthy subjects filled out the same questionnaire about their nose. The 3D Morphable Model from the University of Basel, the Basel Face Model (2019), was used to automatically create a nasal shape for all included patients. Based on the obtained nasal shapes, 3D moulds were printed and filled with silicone, resulting in the SMONO prosthesis. Patients also filled out the Face-Q questionnaire about the SMONO prosthesis. The questionnaire results and anthropometric values were obtained and compared for the conventional, ideal and SMONO nose shape for all patients. Results: There was no statistically significant difference between nasal satisfaction of healthy subjects and patients with the conventional prosthesis. In terms of patient ideals it was found that men prefer wider and slightly shorter noses than women. Fabrication time for all 21 prostheses was 1,5 week. There was a significant difference in satisfaction between the SMONO and the conventional prosthesis with scores of 64.1 and 74.9 (P < 0.05) out of 100 respectively . The anthropometrics of the SMONO prosthesis showed that male nasal shapes were wider and longer than female nasal shapes. The subnasal width was significantly wider for the SMONO prosthesis compared to both the ideal and conventional nose shapes. Patients with a high similarity between shapes scored similar for the satisfaction as well. Discussion and Conclusion: The Basel Face Model can be used to automatically create a nasal shape based on the patients 3D face shape. The described workflow is skill-independent and faster than the conventional workflow. While the satisfaction score for the SMONO prosthesis was lower, the expectation is that by combining steps form both workflows the patients satisfaction will increase, whilst preserving the advantages. This digitized workflow is also promising for providing prostheses in remote areas without anaplastology resources.
Item Type:Essay (Master)
Antoni van Leeuwenhoek
Faculty:TNW: Science and Technology
Subject:02 science and culture in general, 44 medicine
Programme:Technical Medicine MSc (60033)
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