High Strength Substructure Ceramic Crowns

Question 1

Why should check with technician before starting prep?

Answer 1

Different materials require different amount of prep

Question 2

What are high strength ceramic crowns?

Answer 2

Often bilayer
High strength ceramic crown
Aesthetic overlay

Question 3

How should incisal edge be reduced?

Answer 3

Angle palatally - 45 degree
Place depth grooves - 2mm (heavy prep)
Join grooves
Leave interproximal areas - reduce chance iatrogenic damage

Question 4

How should labial surface be prepared?

Answer 4

Place depth grooves (501) -1mm (in both planes)
Join depth grooves using larger chamfer bur
Overall reduction 1.5mm (allow for core and aesthetic veneer)

Question 5

What is the margin for HS crown?

Answer 5

Chamfer

Question 6

How should proximal reduction be undertaken?

Answer 6

Aim 5-10 degree taper

Develop proximal chamfer - reduce 1.5mm

Question 7

How should palatal aspect be prepared?

Answer 7

Chamfer margin

Cingulum reduction - adequate clearance

Question 8

How should HS crown be finished?

Answer 8

Microfine diamond or TC bur
Check for no undercut
Check reduction w/ index

Question 9

How should HS crown be temporised?

Answer 9

ProTemp

Question 10

What is difference between green, blue, red and yellow burs?

Answer 10

Green = coarse
Blue = standard
Red = fine
Yellow = extra fine