case_images: PMC4609806_01
case_images: Initial situation with insufficient cast partial crowns on teeth 45 and 46.
case_images: CRID2015-162178.001.jpg
case_images: PMC4609806_01_CRID2015-162178.001.jpg
case_images: fig1
case_images: For these restorations, repeated clinical intervention had been necessary due to the loss of retention and secondary caries (Figure 1).
case_images: Clinical situation after removal of restoration and caries.
case_images: CRID2015-162178.002.jpg
case_images: PMC4609806_01_CRID2015-162178.002.jpg
case_images: fig2
case_images: After the application of local anesthetics (UltraCain DS, Sanofi Aventis, Frankfurt, Germany), the existing posterior crowns were detached, and the caries was completely removed (Figure 2).
case_images: Preparation of teeth for digital impression-taking. After application of the retraction cords, a top layer of cotton coil impregnated with epinephrine for hemostasis is applied.
case_images: CRID2015-162178.003.jpg
case_images: PMC4609806_01_CRID2015-162178.003.jpg
case_images: fig3
case_images: Finally, a top layer of cotton coil impregnated with epinephrine for hemostasis (Gingi-Pak, Belport Company, Camarillo, USA) was looped around the tooth (Figure 3).
case_images: Detailed views of the intraoral scanning process and the measuring function for the substance reduction after digital bite registration.
case_images: CRID2015-162178.004.jpg
case_images: PMC4609806_01_CRID2015-162178.004.jpg
case_images: fig4
case_images: A buccal scan was taken when the patient closed into an intercuspal position (Figure 4).
case_images: Virtual design of the working models (Model Builder 2013, 3 Shape, Copenhagen, Denmark).
case_images: CRID2015-162178.005.jpg
case_images: PMC4609806_01_CRID2015-162178.005.jpg
case_images: fig5
case_images: Generatively manufactured working model.
case_images: CRID2015-162178.006.jpg
case_images: PMC4609806_01_CRID2015-162178.006.jpg
case_images: fig6
case_images: Dental models made of a beige high-performance resin (80-84 Shore D) were produced in a generative manufacturing process (LED-scanning technology based on STL files) and returned to the dental laboratory within 48 hours (Figures 6(a) and 6(b)).
case_images: Construction of monolithic crown and partial crown restorations with CAD software (DentalDesigner 2013, 3 Shape, Copenhagen, Denmark).
case_images: CRID2015-162178.007.jpg
case_images: PMC4609806_01_CRID2015-162178.007.jpg
case_images: fig7
case_images: After exploring the STL files for the production of the working models, the design process for the fully anatomic restorations was initiated with a CAD software package (DentalDesigner 2013, 3 Shape, Copenhagen, Denmark) (Figure 7).
case_images: ZLS crown and partial crown directly after the milling process.
case_images: CRID2015-162178.008.jpg
case_images: PMC4609806_01_CRID2015-162178.008.jpg
case_images: fig8
case_images: Removal of the fixation pin and shaping of the ground ceramic restorations with water-cooled diamond instruments.
case_images: CRID2015-162178.009.jpg
case_images: PMC4609806_01_CRID2015-162178.009.jpg
case_images: fig9
case_images: Afterward, the occlusal surfaces were also reworked with water-cooled diamond instruments (Figures 9(a) and 9(b)).
case_images: Individual coloring of the crystallized ZLS restoration with special staining liquids.
case_images: CRID2015-162178.010.jpg
case_images: PMC4609806_01_CRID2015-162178.010.jpg
case_images: fig10
case_images: After the first crystallization firing, the restorations were further individualized by using two layers of stains in two separate firing cycles at 800 C (Figure 10).
case_images: Final polishing.
case_images: CRID2015-162178.011.jpg
case_images: PMC4609806_01_CRID2015-162178.011.jpg
case_images: fig11
case_images: The restorations were then mirror-finished with diamond-impregnated silicone instruments and polishing pastes (Figure 11).
case_images: Final fit checking with proximal and occlusal contacts on the digitally fabricated working model.
case_images: CRID2015-162178.012.jpg
case_images: PMC4609806_01_CRID2015-162178.012.jpg
case_images: fig12
case_images: Finally, occlusion and proximal contacts were checked and adjusted on the digitally fabricated working models (Figure 12).
case_images: Occlusal adjustments of the restoration during try-in with a fine-grit-size diamond instrument (8390.314.016, Gebr. Brasseler, Lemgo, Germany).
case_images: CRID2015-162178.013.jpg
case_images: PMC4609806_01_CRID2015-162178.013.jpg
case_images: fig13
case_images: Brasseler, Lemgo, Germany) (Figure 13).
case_images: Conditioning of the cementation surface with 5% hydrofluoric acid for 20 seconds.
case_images: CRID2015-162178.014.jpg
case_images: PMC4609806_01_CRID2015-162178.014.jpg
case_images: fig14
case_images: Polishing Set Clinical, Vita Zahnfabrik, Bad Sackingen, Germany). Prior to adhesive luting, the restoration surfaces intended for bonding were conditioned with 5% hydrofluoric acid (Vita Ceramics Etch, Vita Zahnfabrik, Bad Sackingen, Germany) for 20 seconds (Figure 14).
case_images: Application of silane on the cementing surfaces after conditioning with 5% hydrofluoric acid.
case_images: CRID2015-162178.015.jpg
case_images: PMC4609806_01_CRID2015-162178.015.jpg
case_images: fig15
case_images: After drying the etched restorations, a silane material (Calibra Silane, Dentsply DeTrey, Konstanz, Germany) was applied (residence time: 1 minute) (Figure 15).