Digital Smile Design and CAD/CAM Integration in Prosthodontics

DSD=Digital Smile Design enables visuo-emotional pt=patient communication via digital imaging, video, and mockups to co-design esthetic outcomes. Integrates facial, dental, and gingival analysis using photo стандартизация (90mm lens, retractors, standardized lighting). Key steps: diagnostic wax-up, DSD mockup fabrication (direct/indirect), intraoral scanning (IOS), virtual articulation, and CAD/CAM restoration design. DSD bridges diagnostic → treatment → outcome visualization, enhancing pt acceptance and interdisciplinary coordination. CAD=Computer-Aided Design and CAM=Computer-Aided Manufacturing streamline single-visit prosthetics via digital workflows. Core components: intraoral scanner (e.g., TRIOS, CEREC), design s/w (ex: exocad, 3Shape), milling (subtractive) or 3D printing (additive) units. Materials: lithium disilicate (LiSi), zirconia (Y-TZP), PMMA, composite blocks. Workflow: prep → IOS → design → CAM → try-in/cementation. High-accuracy requires optimal prep design, margin detection, and motion stability during scan. Optical coherence tomography (OCT) and AI-based margin detection improving precision. DSD + CAD/CAM integration enables fully digital smile rehabilitation. Data fusion: superimpose DSD proposal (2D/3D) with intraoral scan and CBCT via reference points or facial scans. Enables biomimetic restorations with phonetic, esthetic, and functional alignment. Key s/w: DSD App, 3Shape Dental System, exocad Ivotion. Interoperability via STL, DICOM, and now 3D PDF or PLY formats. Emerging: AI-driven tooth morphology prediction based on gender, age, ethnicity. Accuracy metrics: marginal gap (target <120μm), internal fit, occlusal accuracy. Milling: wet vs dry, 4- vs 5-axis: 5-axis enables undercuts, anatomical contours. 3D printing: DLP/SLA for models, resins; emerging for permanent crowns (e.g., VITA System). Limitations: learning curve, cost, material constraints, scan errors in hemorrhagic/retracted fields. Best practices: isolation, retraction (cord, mechanical), powdering (if required), systematic scanning path. Dynamic navigation overlays DSD + real-time video for surgical/prosthetic guidance. Digital mockup try-ins assess phonetics, lip support, and vertical dimension. Communication with lab enhanced via digital prescriptions, virtual patient files. Single-visit crown success rates >90% at 5yrs (LiSi, CEREC). Pitfalls: overcontouring due to s/w default settings, poor margin delineation, inadequate occlusion design (lack of dynamic simulation). Solutions: use of virtual articulators, intraoral scan with jaw tracking (CEREC AC), facebow-free bilateral registration. Current SOTA: fully automated crown design (AI-based), generative design algorithms, real-time biomechanical FEA simulation in s/w. Future: closed-loop systems integrating DSD, guided prep, robotic milling, and augmented reality (AR) for try-in. Evidence supports improved precision, workflow efficiency, and pt satisfaction vs traditional analog methods. Training: foundational skills in digital photography, IOS, DSD principles, CAD navigation, and material science. Essential for modern prostho: digital diagnostic workflow literacy.