الفهرس 
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Abstract
This study was performed to evaluate the accuracy of different work flows to create a virtual model in comparison to the conventional plaster model which have been considered as gold standard in orthodontic diagnosis and treatment planning. In addition, patient’s treatment comfort, time perception and preference were evaluated.
Patients were first examined for the presence of full permanent dentition, soundness of teeth, stable occlusion, and had no previous experience with alginate impression or IO scanners. Then, patients were asked to fill two questionnaires to evaluate their anxiety and degree of gagging reflex.
The 50 patients were randomly assigned into two groups with different order of impression making. Each patient had alginate impression made and IO scan taken in separate visits, according to the order of their group, with two weeks interval. The time consumed was recorded as the chairside time.
Following each impression, the patient was handed a perception questionnaire and at the end of the second visit, a preference questionnaire had to be filled.
The alginate impression and wax bite were disinfected and scanned using R700 laser scanner and then poured into plaster models which are also scanned with the laser scanner and the scanning time was also recorded
For accuracy assessment of the virtual models, measurements including the mesiodistal width of teeth, arch perimeter, arch widths, overjet and overbite, were made on virtual models using the provided software and compared to that of the plaster model obtained using digital caliper. Another method, the surface registration analysis by superimposition, was also used to visualize the accuracy and the amount of deviation between the virtual models.
All these data were statistically analyzed to obtain the results of this
study.