PFM crown prep - wings required?

[drdoe]

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Hello,

So I am trying to prepare porcelain fused to metal crowns for the first time. I went through Shillingburg, but I have a few doubts. Can someone please help in the steps for preparing PFM crowns .I know you need a shoulder on buccal & chamfer on lingual.

1.Do we need to make wings on while preparing or just merge them? What is the normal procedure in most schools?
2.What is the thickness of the wings, if needed?
3. If there is no wings, how & where do I merge both finish margins?
4. Is there a need to place a bevel in shoulder?
5. When preparing PFM on #30/#19, will the occlusal reduction follow all the 5 cusps? I mean, do I need to keep the smallest cusp in the occlusal outline?

Thanks alot

 

[Adversary]

Shouldn't your dental school have taught you how to do this before you graduated?

Hello,

So I am trying to prepare porcelain fused to metal crowns for the first time. I went through Shillingburg, but I have a few doubts. Can someone please help in the steps for preparing PFM crowns .I know you need a shoulder on buccal & chamfer on lingual.

1.Do we need to make wings on while preparing or just merge them? What is the normal procedure in most schools?
2.What is the thickness of the wings, if needed?
3. If there is no wings, how & where do I merge both finish margins?
4. Is there a need to place a bevel in shoulder?
5. When preparing PFM on #30/#19, will the occlusal reduction follow all the 5 cusps? I mean, do I need to keep the smallest cusp in the occlusal outline?

Thanks alot

 

[drdoe]

Shouldn't your dental school have taught you how to do this before you graduated?

Unfortunately, my school did not teach us to practice PFMs as these were reserved for the PGs (post-grad students) We were only taught to practice anterior all ceramic crowns.

 

[drdoe]

Thanks Florarose!!

 

[sweetdental]

hi drdoe,

U r practiCing PFM PREP FOR AN INTERVIEW??
wats ur email id??Im also working on PFM prep

 

[drdoe]

Im still waiting on an interview call. Thought I'll start preparing in the mean time. I've seen some schools ask for PFM crown preps too.

 

[sweetdental]

Oh really?? WHICH school and is it for dds program?