812
DRstep-by-step outline for crown preparation of a maxillary central incisor (usually for all-ceramic or PFM crown):
1. Labial Reduction
Depth-cut grooves (1.0–1.2 mm) placed with a round-end tapered diamond.
Uniform reduction following the natural contour of the labial surface.
Smooth reduction without sharp angles.
2. Incisal Reduction
Depth-cut grooves of 1.5–2.0 mm (depending on material).
Reduce incisal edge in a single plane, maintaining the natural incisal form.
3. Lingual Reduction
Cingulum reduction about 1.0–1.2 mm for all-ceramic / metal-ceramic crowns.
Axial reduction with clearance for opposing tooth (≈1.0–1.5 mm).
Lingual fossa shaped with a concave reduction for proper thickness.
4. Proximal Reduction
Break proximal contacts with a thin tapered bur.
Ensure smooth transition between labial and lingual reductions.
5. Finish Line
Circumferential shoulder (1.0–1.2 mm, rounded internal angle) for all-ceramic.
Can be chamfer (0.5–1.0 mm) if PFM crown.
Located slightly supragingival or equigingival (unless esthetics demand subgingival).
6. Finishing
Round all line angles (avoids stress concentration in ceramic).
Smooth, continuous margin.
Ensure adequate taper (6° total convergence ideally).
✅ Key reductions for maxillary central incisor crown prep:
Labial: 1.0–1.2 mm
Incisal: 1.5–2.0 mm
Lingual: 1.0–1.5 mm
Margin: 1.0–1.2 mm shoulder/chamfer
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