week 3- anterior metal ceramic crown Flashcards Preview

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Flashcards in week 3- anterior metal ceramic crown Deck (8)
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1

what does the shoulder do

marginal integrity
structural durability

2

what does the axial reduction do

retention and resistance
structural durability

3

what does the wing do

R&R

4

what are the prep principles of an anterior metal ceramic crown

→ Adequate room for palatal and lingual thickness of the metal
→ And the metal and porcelain buccally
→ Have retention and resistance forms
→ No undercuts
→ Margins supra gingival where possible
→ Chamfer margin 0.5mm on the palatal aspect
Shoulder margin of 1.2-1.6mm on the buccal aspect for the metal and porcelain

5

what type of reduction to we follow on the palatal aspect

So from the margin you make on the buccal surface- line the tooth up on the longitudinal axis of the buccal surface and just bring it exactly in the same angulation to the palatal aspect
This is to ensure we get optimum retention as well as following the tooths normal morphology

6

how many planes do we have on the buccal surface

2 planes of reduction

7

final criteria for the anterior metal ceramic crown

→ Depth-grooves incisally (2mm)
→ Incisal reduction (sloping gingivally towards palatal side)
→ Initial labial reduction in 2 planes (chamfer)
→ Palatal margin (0.5 mm chamfer)
→ Palatal reduction (0.5 – 0.7 mm)
→ Inter-proximal reduction (long thin tapered and chamfer diamonds)
→ Labial shoulder (1.2- 1.5mm)
→ Finish margins/check for undercuts
No sharp corners

8

why is a two plane reduction necessary

If there is not a two plane reduction it can lead to the pulp being compromised