الفهرس 
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Abstract
Purpose: To assess the accuracy of virtual articulation in direct digital workflow
(DDW) and indirect digital workflow (IDW) in arches prepared for fixed partial
dentures (FPDs).
Materials and Methods: Five pairs of master models were used in this study representing
different clinical scenarios of full dentate (FD), and prepared arches for fixed partial dentures
as follows: FD group, short span posterior (SSP group), long span posterior (LSP group), short
span anterior (SSA group), and long span anterior (LSA). Fourteen pairs of interarch reference
points were added to each set of master models to measure linear interarch distance with a
caliper (reference measurements). The direct digital workflow included digital scans and virtual
articulation with buccal scan images using an intraoral scanner. The indirect digital workflow
included conventional polyvinylsiloxane impressions and bites followed by pouring, mounting,
and scanning the stone models in a laboratory scanner. The scanned stone models were virtually
articulated with buccal scanning in the laboratory scanner. Digital linear interarch
measurements on all virtually-articulated models were compared with reference measurements.
The absolute mean differences in linear interarch distances were calculated. The Mann-Whitney
test was used for statistical analysis (α = .05).
Results: The direct digital workflow produced significantly less linear interarch deviations
in the virtually articulated models compared to the indirect digital workflow for all study groups
(P < .05). However, the direct digital workflow had significantly less accuracy for virtual
articulation in long span posterior, long span anterior, and short span anterior groups compared
to the full dentate group.
Conclusions: Both workflows produced virtually-articulated models with acceptable accuracy.
However, the direct digital workflow had significantly better accuracy in all assessed clinical
scenarios.
Keywords: Articulation, digital, fixed partial denture, linear deviations