Aim: To show how to prepare a virtual set-up from digital casts, which can replace the plaster
set-up. Using the virtual set-up, many solutions can be tried by the clinician and shared
with the dentist, then presented to the patient. Material and Methods: Starting from digital
casts, a virtual occlusal set-up in 3 dimensions can be performed with specific software. A
format with all instructions and the impressions is sent via Internet, and, after few days, a
file is returned, also via Internet, with the first set-up. From that point, all modifications can
be made by the clinician, following a step-by-step procedure, and new set-ups can be made
from that first solution. Results: Two cases of virtual occlusal set-up are presented; both are
in the permanent dentition, without extractions. Prior to orthodontic treatment, the clinician
can forecast the final result to determine the treatment plan, according to the amount and
the direction of tooth movement. Conclusion: The virtual occlusal set-up can be used only
in the permanent dentition, in malocclusions with an evident dentoalveolar problem in the 3
dimensions of space. It can also be used in preprosthetic dentistry. World J Orthod
2003;4:162–166.
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