CATEGORY 68 AUSTRALASIAN DENTIST digital approach therefore contributes to more time- and cost-efficient treatment4. CAD/CAM fabrication also enables the processing of new materials. Milled blanks show lower residual monomer content, improved homogeneity, and higher flexural and fracture strength5-8. As a result, the prostheses can be designed more delicately and are also less susceptible to discoloration9. While conventionally manufactured prostheses exhibit polymerization shrinkage when transferred to PMMA, this is eliminated when manufacturing subtractively, resulting in a higher accuracy of fit10, 11. While subtractive manufacturing methods are well-established in the dental world for many years, additive manufacturing is becoming increasingly popular. 3D printing offers a fast, material-saving alternative for producing try-ins, temporaries, and final dentures. It allows multiple items to be produced simultaneously and to reconstruct areas with large undercuts without any problems. The investment costs for desktop 3D printers are also significantly lower12. Although additively manufactured prostheses are equal to conventionally manufactured prostheses in many respects, they still have material-specific disadvantages compared to subtractive manufactured prostheses. These include lower flexural strength and fracture resistance and an increased tendency to discoloration13. Furthermore, the user-sensitive postprocessing and the manufacturing process can result in fluctuations in the materialspecific properties and ultimately lead to differences in quality13. The combination of additive and subtractive processes may revolutionize future denture fabrication and enable more efficient, individualized patient care. The PolyJet process, which enables multi-material printing, is a promising advancement beyond current SLA and DLP technologies12. In the future, dentures could be printed in a single step with layers of varying mechanical properties, allowing for highly individualized designs with optimized aesthetics and functionality. u Contact gapmagazines@gmail.com for a complete list of references CLINICAL Figure 13: Scanned maxillary prosthesis with functional impression in situ. Figure 16: Denture base connected to the blank via connectors in the nesting software inLab CAM. Figure 19: Milled denture bases connected to the blank via connectors. Figure 22: Final, milled full dentures after final polishing. Figure 14: Scanned mandibular prosthesis with functional impression in situ. Figure 17: Tooth segments connected to the blank via connectors in the nesting software inLab CAM. Figure 20: Finished polished denture segments before luting. Figure 23: Milled, definitive full dentures in situ in frontal view. Figure 15: Matching the maxillary and mandibular scans with the bite scan. Figure 18: Tooth segments in the blank with workpiece holder after milling. Figure 21: Checking the fit of the milled denture segments. Figure 24: Milled, definitive full dentures in situ in lateral view.
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