On the other hand, another new alternative for digital dental model fabrication is direct scanning of the dentition with an intraoral scanner. 4 assessed the validity of digital models obtained from the CBCT scanning of alginate impressions in tooth width measurements in 22 subjects, and concluded that tooth-width measurements on digital models did not differ significantly from those on plaster models. The results indicated that digital orthodontic models obtained from CBCT scanning of both alginate and vinylpolysiloxane impressions provided dimensionally accurate representations of intra-arch relationships for orthodontic evaluation. 3 studied 16 sets of maxillary and mandibular vinylpolysiloxane and alginate impressions that were converted into CBCT scanned dental models to evaluate the accuracy of intra- and interarch measurements. 2 reported that tooth width measurements from digital models obtained by CBCT scanning of alginate impressions were as reproducible as those obtained from plaster models with calipers. Their results proved that the CBCT technique is accurate enough for the measurements in orthodontic diagnosis. Many studies 2 3 4 have investigated the validity of CBCT scanning of alginate impressions. More recently, direct scanning of alginate impressions using cone-beam computed tomography (CBCT) has been introduced to eliminate the need for plaster pouring.
The most popular method of fabricating digital dental models is optical or laser scanning of a plaster cast obtained from an alginate impression.
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