Crown & Bridgework Preparation

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These are the suggested ways for prepping a tooth for a veneer, crown cutting and other restorations.

		Reduction	Finish Line Depth & Configuration
Anterior Crowns	All-Ceramic (veneered or monolithic) IPS e.max® or IPS Empress Esthetic®	2.0mm incisally 1.0mm buccal/lingual	0.8-1.0mm shoulder
	Porcelain-fused-to-zirconia	2.0mm incisally 0.6-1.0mm lingual aspect (Porcelain guidance requires greater clearance)	>0.4mm chamfer lingually >1.0mm labial
	Metal-ceramic (Porcelain-fused-to-metal)	2.0mm incisally 0.5-1.0mm lingual aspect (Porcelain guidance requires greater clearance)	1.5mm labial shoulder or heavy chamfer 0.5mm lingual chamfer 1.5mm circumferentially for 360-degree ceramic margin
Posterior Crowns	Full contour crowns (metal or zirconia)	1.0mm non-functional cusps 1.5mm functional cusps	0.3-0.5mm shoulder or heavy chamfer
	All-Ceramic (veneered or monolithic) IPS e.max® or IPS Empress Esthetic® Porcelain-fused-to-zirconia	2.0mm non-functional cusps 2.5mm functional cusps	1.0mm shoulder or heavy chamfer
	Metal-ceramic (Porcelain-fused-to-metal)	If metal occlusal, as with FMC 2.0mm non-functional cusps 2.5mm functional cusps	1.5mm labial shoulder or chamfer 0.5mm lingual chamfer (metal collar) 1.5mm circumferentially for 360-degree ceramic margin

Suggested burs for full metal crown / PFM / all-ceramic crowns preparation

Restoration	Preparation Area	Bur
Full Metal Crown	Occlusal reduction and functional cusp bevel	Coarse grit round end tapered diamond
	Proximal axial reduction	Medium grit short needle diamond and coarse grit round end tapered diamond
	Buccal and lingual axial reduction	Coarse grit tapered torpedo diamond
	Chamfer and axial finish line	Fine grit tapered torpedo diamond
PFM Anterior	Incisal and labial reduction	Coarse grit flat-end tapered diamond
	Lingual reduction	Coarse grit football-shaped diamond
	Initial proximal reduction	Medium-grit long needle diamond
	Lingual axial reduction	Coarse grit tapered torpedo diamond and finish with Fine grit tapered torpedo diamond
PFM Posterior	Occlusal reduction and functional cusp bevel	Coarse grit round end tapered diamond
	Buccal reduction (2 planes)	Coarse grit flat-end tapered diamond
	Proximal axial reduction	Medium grit short needle diamond
	Lingual and axial reduction	Coarse grit tapered torpedo and fine grit tapered torpedo diamond
	Buccal, axial and shoulder finishing	Fine grit flat-end tapered diamond
All-Ceramic	Incisal and labial reduction (2 planes)	Coarse grit flat-end tapered diamond
	Lingual and axial reduction	Coarse grit flat-end tapered diamond
	Lingual reduction	Coarse grit football-shaped diamond
	Axial wall andradial shoulder	Fine grit flat-end tapered diamond

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