Tooth preparation for indirect restorations involves using decreasing grit diamond burs to create slightly divergent walls and rounded internal line angles. Immediate dentin sealing and blocking out undercuts is recommended. Cementation of indirect restorations requires surface treatment of the restoration and tooth walls, with acid etching and silane for ceramic inlays. Rubber dam isolation and a three step etch and rinse bonding system is used along with dual cured resin cement. Excess cement is removed and the restoration is polymerized.

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60. TOOTH PREPARATION FOR INDIRECT TOOTH COLORED RESTORATIONS
• Cylindrical round-ended diamond burs with decreasing grit (From 60-70 µm to 15-20 µm grit)
• Slightly occlusal divergent walls (6○ – 8○)
• Round internal line angles
• But joint preparation margins
• Immediate dentin sealing using adhesive procedure and rubber dam
• Blocking out defect-related undercuts
• Finishing of the preparation with diamond burs and rubber points

167. CEMENTATION PROTOCOL FOR INDIRECT TOOTH COLORED RESTORATIONS
SURFACE TREATMENT OF INLAY
FITTING SURFACE
SURFACE TREATMENT OF
PREPARATION WALLS
CEMENTATION
• Use solvent or sandblasting (50 µm
Al2O3 at 2 bar pressure) for composite
resin inlays
• Acid etching with 10% hydrofluoric
acid for 7 minutes followed by silane
coupling agent for ceramic inlays
• Rubber dam isolation
• Three steps etch & rinse bonding
system
• Duel cured adhesive composite resin
cement with suitable shade and
consistency
• Excess cement is removed with thin
bladed instrument and floss
• Polymerization
• Excess cement is removed by sharp
bladed instruments
• Check occlusion, finishing & polishing