Operative techniques - prep

Question 1

What burs are used to prepare inlays and onlays?

Answer 1

• No. 170L
• No.169L
• coarse-grit flame diamond
• flame

Question 2

What is the preparation for a ceramic inlay?

Answer 2

• 1.5-2mm isthmus
• 1.5mm depth
• 1mm shoulder/chamfer margin
• butt-joint cavosurface margins (no bevel)

Question 3

What is the preparation for a gold inlay?

Answer 3

• 1mm isthmus
• 1.5mm depth
• 0.5mm chamfer margin
• 15-20 degree bevel upper 1/3 of isthmus wall

Question 4

What is used to cement ceramic inlays and onlays?

Answer 4

• NX3
• RelyX (RGMI)

Question 5

What is used to cement gold inlays and onlays?

Answer 5

• AquaCem
• Panavia
• RelyX (RMGI)

Question 6

What is the preparation for a ceramic onlay?

Answer 6

• working cusp 2mm reduction
• non-working cusp 1.5mm reduction
• 1.5mm depth
• butt-joint cavosurface margin (no bevels)
• 1mm shoulder/chamfer margin
• 1mm proximal box clear of contact points

Question 7

What is the preparation for a gold onlay?

Answer 7

• non-working cusp 0.5mm reduction
• working cusp 1mm reduction
• 1.5mm depth
• 15-20 degree bevel upper 1/3 isthmus wall
• 0.5mm chamfer margin
• 1mm proximal box clear of contact points

Question 8

When is shoulder finish line used?

Answer 8

Ceramic

Question 9

When is chamfer finish line used?

Answer 9

Metal

Question 10

What is the preparation for a full gold crown?

Answer 10

Axial reduction - 0.5mm
Occlusal reduction (functional) - 1.5mm
Occlusal reduction (non-functional) - 0.5mm
Finish line - chamfer 0.5mm

Question 11

What is the preparation for a ceramic crown (traditional porcelain)?

Answer 11

Axial reduction - 1mm
Occlusal reduction (functional) - 1.5mm
Occlusal reduction (non-functional) - 1mm
Finish line - shoulder 1mm

Question 12

What is the preparation for a metal ceramic crown?

Answer 12

Axial reduction - 1.3mm
Occlusal reduction (functional) - 1.8mm
Occlusal reduction (non-functional) - 1.3mm
Finish line - chamfer 0.5mm (metal only) OR shoulder 0.4mm (metal) and 0.9mm (ceramic)

Question 13

What is the preparation for an all ceramic crown (alumina/zirconia framework)?

Answer 13

Axial reduction - 1.5mm
Occlusal reduction (functional) - 2mm
Occlusal reduction (non-functional) - 1.5mm
Finish line - chamfer 1-1.5mm