Essential biological reduction depths, margin geometries, and chairside protocols engineered to guarantee sub-micron marginal adaptation, zero remakes, and predictable seating with Japanese Roland 5-axis milling.
Calibrated specifically for Roland DGSHAPE 5-axis milling burs and Aidite monolithic sintering parameters.
| Material & Restoration | Occlusal / Incisal | Axial Reduction | Margin Geometry | Taper & Line Angles |
|---|---|---|---|---|
Monolithic & Multilayer Zirconia (Aidite 3D Pro) High-Strength Ceramic · Roland 5-AxisPosterior crowns, multi-unit bridges, bruxers, minimal clearance | 1.0mm – 1.2mm (Anterior Incisal: 1.2mm) | 0.8mm – 1.0mm | Deep Chamfer (0.5mm – 0.8mm) with rounded internal line angles | 6° – 8° Total Convergence |
Porcelain-Fused-to-Metal (PFM / Co-Cr) Ceramic-Metal HybridHigh functional masticatory load, long-span bridges, economical tiers | 1.5mm – 2.0mm (0.5mm metal substructure + 1.0mm–1.5mm porcelain) | 1.2mm – 1.5mm | 90° Shoulder or Heavy Chamfer (1.0mm – 1.2mm) | 6° – 10° Total Convergence |
IPS E-Max / Lithium Disilicate & Veneers High Aesthetics · TranslucentAnterior cosmetic smile designs, single units, inlays/onlays | Veneers: 1.0mm Incisal Overlap / Butt Joint | Full Crowns: 1.5mm | Veneers: 0.5mm – 0.7mm Facial | Full Crowns: 1.0mm | Light Chamfer / Rounded Shoulder (0.3mm – 0.5mm) | 6° – 8° Total Convergence |
Avoid the most frequent causes of restoration rocking, marginal discrepancies, and chairside delays.
The Mechanical Science: Diamond milling tools on Japanese Roland 5-axis machines have a physical tip radius (smallest CNDL bur is 0.6mm). Sharp incisal angles or pointed transitions force the CAM software to "over-mill" the internal fitting surface to achieve seating, creating excessive cement gap and ceramic weakness.
✓ Recommended Clinical Action:Smooth all transition line angles and incisal edges with a fine football or torpedo finishing bur.
The Mechanical Science: Rigid CAD/CAM sintered zirconia has zero flexure. Any undercut along the preparation walls creates an impossible path of insertion, forcing virtual software blockout that compromises retention and marginal fit.
✓ Recommended Clinical Action:Maintain a single, unambiguous path of draw with 6°–8° total occlusal taper (3°–4° per axial wall).
The Mechanical Science: Knife-edge or indistinct bevels prevent milling tools from establishing a defined ceramic boundary, causing micro-chipping during pre-sintered green-state milling and leading to over-contoured margins in the mouth.
✓ Recommended Clinical Action:Always cut a crisp, continuous Deep Chamfer with at least 0.5mm–0.8mm distinct horizontal ledge.
The Mechanical Science: Inadequate reduction (< 1.0mm) forces our digital technicians to thin the zirconia disc during nesting, risking crown fracture under heavy masticatory load or necessitating chairside adjustments that strip glaze.
✓ Recommended Clinical Action:Verify 1.0mm–1.2mm clearance in centric occlusion AND during lateral/protrusive excursions.
The Mechanical Science: 85% of remake requests across Bangladesh stem from indistinct subgingival margins caused by sulcular fluid or collapsed gingival tissue. Intraoral scanners and PVS silicone cannot read through blood or saliva.
✓ Recommended Clinical Action:Place size #00 cord first into sulcus floor, followed by size #1 or #2 soaked in aluminum chloride.
Whether sending digital STL/OBJ scans or physical PVS rubber base impressions.
Disable AI teeth-cleaner before margin capture. Verify there are zero mesh holes along the finish line before patient dismissal.
Always use a rigid metal or custom tray. Use double-mix one-step technique; inspect margins for zero drags, bubbles or tray impingement.
For anterior E-max or multilayer zirconia, photograph the prepared stump with a shade tab (ND1–ND9) in the same focal plane under 5500K daylight.
Experience zero-remake prosthetic predictability. Submit cases online in 4 steps or download our official A4 prescription slip.