PMC8331307_01
PMC8331307_02
PMC8331307_03
Intraoral findings ((a) upper jaw, (b) lower jaw) and a familiar denture used by the patient ((c) occlusal surface of upper denture, (d) mucosal surface of upper denture, (e) occlusal surface of lower denture, and (f) mucosal surface of lower denture). The arrowhead indicates an ulcer in the left alveolar ridge of the lower jaw.
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fig1
She was referred to our hospital for the fabrication of new dentures.  Figure 1 shows the oral findings (Figures 1(a) and 1(b)) and the old dentures (Figures 1(c)-1(f)). An ulcer was noted in the left alveolar ridge of the mandible, with severe bilateral ridge resorption (Figure 1(b)).
PMC8331307_04
Optical impressions recorded for the upper (a) and lower (b) dentures with an optical scanner. The scanned data were converted into standard tessellation language (STL) data and exported to a three-dimensional (3D) printer interface software, after which the support bars were set (c). A 3D printer using dental photocurable resin fabricated the copy denture at 100 mum/layer ((d) occlusal surface of upper denture, (e) mucosal surface of upper denture, (f) occlusal surface of lower denture, and (g) mucosal surface of lower denture).
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fig2
The copy dentures were polished with a dental carbide cutting tool (H251GSQ-060; Komet, Lemgo, Germany) (Figures 2(d)-2(g)). 3D scanning of each of the upper and lower dentures according to the software's instructions and saving of the STL data were completed in 10 min. An additional 1 min was required for transfer of the STL data to a composer.
PMC8331307_05
New dentures.
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fig3
After deflasking, the dentures were checked using the articulator for processing errors and subsequently polished (Figure 3).
Flowchart of the combined workflow.
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fig4
The procedures followed in this case are shown in Figure 4.