Tooth Preparation Guide for Pediatric Full Crowns
General Principles
- Preserve as much healthy tooth structure as possible
- Ensure passive fit and complete seating of the crown
- Maintain natural anatomical contours to avoid gingival trauma
Occlusal Reduction
- Amount : 1.5–2.0 mm (for zirconia)
- Goal : Provide clearance for the thickness of the crown
- Tip : Maintain original occlusal anatomy if possible for proper function
Axial Reduction
- Amount : 1.0–1.5 mm circumferentially
- Taper : 6–10° convergence between opposing walls
- Margin : Feather-edge or light chamfer; finish 0.5–1 mm subgingival
- Note : Avoid creating ledges or shoulders—zirconia crowns need smooth, continuous margins
Line Angles and Contours
- Internal Angles : All should be rounded—not sharp
- External Contours : Mirror natural tooth for retention and esthetics
- Tip : Round incisal/occlusal edges for a passive, tension-free fit
Moisture Control
- Use a rubber dam or cotton rolls with suction to maintain a dry field
- Ensure clean and dry surfaces for accurate crown trial and cementation
Trial Fitting of Crown
- Try-in crown after prep to check passive seating
- Ensure no rocking or occlusal interference
- Adjust internal surface of crown if minor modification is needed—never the external
Surface Cleaning and Cementation
- Clean crown internally with alcohol or ultrasonic cleaner
- Use biocompatible luting cement (RMGIC or bioactive cement)
- Seat with firm finger pressure and maintain until set
- Remove excess cement with floss and explorer
Final Check
- Verify occlusion, fit, and gingival adaptation
- Provide post-op hygiene instructions
- Schedule follow-up to monitor gingival health and eruption changes
General Principles
- Preserve as much healthy tooth structure as possible
- Ensure passive fit and complete seating of the crown
- Maintain natural anatomical contours to avoid gingival trauma
Occlusal Reduction
- Amount : 1.5–2.0 mm (for zirconia)
- Goal : Provide clearance for the thickness of the crown
- Tip : Maintain original occlusal anatomy if possible for proper function
Axial Reduction
- Amount : 1.0–1.5 mm circumferentially
- Taper : 6–10° convergence between opposing walls
- Margin : Feather-edge or light chamfer; finish 0.5–1 mm subgingival
- Note : Avoid creating ledges or shoulders—zirconia crowns need smooth, continuous margins
Line Angles and Contours
- Internal Angles : All should be rounded—not sharp
- External Contours : Mirror natural tooth for retention and esthetics
- Tip : Round incisal/occlusal edges for a passive, tension-free fit
Moisture Control
- Use a rubber dam or cotton rolls with suction to maintain a dry field
- Ensure clean and dry surfaces for accurate crown trial and cementation
Trial Fitting of Crown
- Try-in crown after prep to check passive seating
- Ensure no rocking or occlusal interference
- Adjust internal surface of crown if minor modification is needed—never the external
Surface Cleaning and Cementation
- Clean crown internally with alcohol or ultrasonic cleaner
- Use biocompatible luting cement (RMGIC or bioactive cement)
- Seat with firm finger pressure and maintain until set
- Remove excess cement with floss and explorer
Final Check
- Verify occlusion, fit, and gingival adaptation
- Provide post-op hygiene instructions
- Schedule follow-up to monitor gingival health and eruption changes
