crown prep with wings

[believer88]

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hi

i am scheduled to have my prostho lab final tomorrow and im totally freaked out. can someone explain how to do winged prep on a premolar? it'd be helpful to see a video.
thanx!

 

[believer88]

i missed out on a couple of labs due to personal problems..so i never actually practiced winged prep. im ok with wingless prep.

 

[Decan]

what i do is i use a small coarse chamfer bur and go around the whole tooth and place a chamfer (just like a wingless prep). then grab a coarse small shoulder bur and place a shoulder (1mm ) on the buccal surface and extend it into the proximal areas. i'm not sure what you've been taught but we were told to place the wings .5-1 mm past the proximal contacts. if you have an adequate chamfer around the wings should naturally fall into place due to the difference in tooth structure removal. also, make sure you have a smooth transition between your shoulder and the chamfer. now just smooth everything with fine chamfer, carbides, or whatever you're comfortable with. with a practical tomorrow i'm not sure this will be of any use...you may actually want to try this (tonight maybe?) before you get into your practical.

 

[believer88]

what i do is i use a small coarse chamfer bur and go around the whole tooth and place a chamfer (just like a wingless prep). then grab a coarse small shoulder bur and place a shoulder (1mm ) on the buccal surface and extend it into the proximal areas. i'm not sure what you've been taught but we were told to place the wings .5-1 mm past the proximal contacts. if you have an adequate chamfer around the wings should naturally fall into place due to the difference in tooth structure removal. also, make sure you have a smooth transition between your shoulder and the chamfer. now just smooth everything with fine chamfer, carbides, or whatever you're comfortable with. with a practical tomorrow i'm not sure this will be of any use...you may actually want to try this (tonight maybe?) before you get into your practical.

hm..i know that stuff. i just wanna know how exactly you make the wings. like with what burs and the direction of cutting.

 

[Decan]

i don't exactly "make" the wings...they are there because you have more tooth structure removal on the buccal and less on the lingual. as i've described, place a chamfer all around and then a 1 mm shoulder on the buccal and the wings fall into place wherever you stop your shoulder. as for the burs, small chamfer for the lingual, small shoulder for the buccal. sorry, i don't know the numbers.

 

[believer88]

i don't exactly "make" the wings...they are there because you have more tooth structure removal on the buccal and less on the lingual. as i've described, place a chamfer all around and then a 1 mm shoulder on the buccal and the wings fall into place wherever you stop your shoulder. as for the burs, small chamfer for the lingual, small shoulder for the buccal. sorry, i don't know the numbers.

ok. thanx. we were taught to do chamfer and shoulder differently..but later the prof asked us to use the same bur for the chamfer and shoulder then modify the shoulder to make things easier. i will get together with my friend and practice. thanx a lot : )

 

[Decan]

not a problem. good luck!

 

[The Hammer]

Just curious but exactly why are they teaching you to use a "winged" crown? That is not a very current technique.

 

[Decan]

Just curious but exactly why are they teaching you to use a "winged" crown? That is not a very current technique.

Here they teach us winged crown preps for metal ceramic restorations.

 

[The Hammer]

Here they teach us winged crown preps for metal ceramic restorations.

Still doesn't explain why they want you to learn an antiquated technique. Are you splinting the teeth for stabilization or retention? Are they going to teach you how to do impressions with plaster next?

 

[Decan]

Are they going to teach you how to do impressions with plaster next?

Learned it.

The reason they gave us was that it helps conserve tooth structure.