R_Bibb_Medical_Modelling_The_Application_of_Adv.pdf

Case studies 217
authors intend to evaluate other potentially suitable technologies in future
studies once an initial specifi cation has been developed.
Manufacture
The technologies used in this study have shown that they are capable of
producing a complete prosthesis. However, the processes all require
improvement in order to match or improve upon existing techniques. The
ThermoJet ® wax process produced a good quality pattern in an appropriate
and useful material that integrated with existing skills and techniques.
However, it requires the ability to generate thinner edges if it is to produce
a complete pattern without modifi cation.
The SLM bar was suffi ciently strong and rigid enough for the application,
and the material should prove corrosion resistant enough for most patients.
However, the bar did not fi t as precisely as would be expected of a bar
made by existing techniques and the surface was slightly pitted. As the
overall shape and accuracy appeared adequate, fi ner control of the process
may yield parts with better detail and surface fi nish.
The stereolithography shell component was accurate and rigid enough
for the application. The retention strength of the clips was not very high,
although it may have been high enough for the purpose. However, the clips
did not withstand repeated use and quickly wore down, severely degrading
retention strength. Therefore, the process could prove adequate for the
purpose if a harder wearing material was available.
6.12.9 Conclusions
Literature to date and the fi ndings of this study have demonstrated that,
whilst advanced technologies enable the digital design and RP fabrication
of complete facial prostheses, further work is needed before they produce
results comparable to existing techniques. Without a specifi cation against
which potential technologies may be measured and towards which they may
be developed, quantifying success is based on subjective assessment and
expert opinion. The authors intend to use the fi ndings of this study to direct
further research aimed at developing a specifi cation that will provide quantifi
able and objective measures against which advanced technologies may
be assessed.
6.12.10 References
1. Wolfaardt J, Sugar A, Wilkes G (2003), ‘Advanced technology and the future
of facial prosthetics in head and neck reconstruction’, International Journal of
Oral and Maxillofacial Surgery, 32 (2), 121–3.