R_Bibb_Medical_Modelling_The_Application_of_Adv.pdf

74 Medical modelling
5.9 SL model of the mandible.
and the development of at least one medical standard material is an
advantage.
A range of medical resins are available (RenShape ® SL, Huntsman
Advanced Materials, Everslaan 45 B-3078 Everberg, Belgium) that have
been tested to an internationally recognised standard (USP 23 Class VI).
The materials are acrylate-based and hence show some curl characteristics
when building square or fl at models, but the very nature of anatomical
structures normally eliminates this or reduces the effect to the point where
it poses no signifi cant problems. The resin has been tested to the standard
that shows that it is safe to be exposed to patient fl uids, making it suitable
for use in the operating theatre as a surgical aid or to make templates and
guides.
This resin can also be selectively coloured. A single pass of the laser will
solidify the resin, a subsequent high power pass will cause the solidifi ed
resin to change colour. This allows internal features to be made visible
through the thickness of the model, which can be used to show, for example,
the roots of teeth in the jaws bones or tumours, as illustrated in Figs 5.11