Starburst depends upon the atomic number of the metal used to make the
material radiopaque. GP tends to have quite a marked sytarburst effect. If
wanting to use a radiopaque marker for a scan, rather than specifically for
the NobelGuide software, your best bet is to use a radiopaque stent tooth
such as Ivoclar TAC. These show up well on a scan but are not too high a
density that they result in the starburst effect. Dr Stuart Ellis
Hi. This is because of the NobelGuide software. The software is calibrated
to search for 1mm diameter gutta percha markers. This is how it merges the
scan of the patient and the second scan of the stent together. Even when
using other software systems we do do use large gutta percha markers.
Because of the limitations of the CT scan algorithms you get an artifact
called 'starburst' around highly radiopaque materials.
I fabricate ct stents for a prosthodontist in LA, and I'm curious as to why
you place gutta percha throughout the palate. I drill 1 3-4mm hole (for
anterior such as yours) directly down the middle of the tooth, or where the
scan indicated the best position was, then fill it with radiopaque material.
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