Purpose: The aim of the present study was to evaluate the effect of the build angle and the support configuration (thick versus
thin support) on the dimensional accuracy of 3D-printed full-coverage dental restorations.
Materials and Methods: A full-coverage
dental crown was digitally designed and 3D-printed using stereolithography-additive manufacturing (SLA-AM) technology. Nine
different angles were used during the build process: 90, 120, 135, 150, 180, 210, 225, 240, and 270 degrees. In each angle,
the crown was printed using a thin and a thick support type, resulting in 18 specimens. The specimens were digitally scanned
using a highresolution optical surface scanner (IScan D104i; Imetric 3D). The dimensional accuracy was evaluated by digital
subtraction technique. The 3D digital files of the scanned printed crowns (test model), exported in standard tessellation
language (STL) format, were superimposed with the STL file of the designed crown (reference model) using Geomagic Studio 2014
Results: The root mean square estimate value and color map results suggest that the build angle and support
structure configuration have an influence on the dimensional accuracy of 3D-printed crown restorations. Among the tested angles,
the 120-degree build angle showed a minimal deviation of 0.029 mm for thin support and 0.031 mm for thick support, indicating
an accurate fit between the test and reference models. Furthermore, the deviation pattern observed in the color map was homogenously
distributed and located further away from the critical marginal area.
Conclusions: Within the limitations of this study,
the selection of build angle should offer the crown the highest dimensional accuracy and self-supported geometry. This allows
for the smallest necessary support surface area and decreases the time needed for finishing and polishing. These properties
were mostly observed with a build angle of 120 degrees combined with a thin support type.