Why non engaging?

[Adi]

Hi
In a lecture the other day, the lecturer said that a bridge MUST be none engaging (that means on none-hexed abutments I believe),I didn't have the chance to ask him why.
So why?

And is ok to make a bridge on multiple (hexed and none-hexed) abutments? It's stronger this way isn't it?

 

[daintybutton]

Passive fit.

 

[Adi]

Any reason other than passive fit?

 

[DanM]

Any reason other than passive fit?

A screw retained bridge with non-parallel abutments will not seat if both are hexed. I'll often leave one engaging (hex) and one non-engaging which helps with inserting but reduces the amount of non-parallelism for the bridge to seat.

 

[rkm rdt]

Hi
In a lecture the other day, the lecturer said that a bridge MUST be none engaging (that means on none-hexed abutments I believe),I didn't have the chance to ask him why.
So why?

And is ok to make a bridge on multiple (hexed and none-hexed) abutments? It's stronger this way isn't it?

You have to distinguish between screw retained and cement retained.
As ADi has pointed out , you can have a hexed and non hexed abutment for a screw retained bridge however
both abutments can be engaging if the bridge is cement retained. Good luck removing the cemented bridge though.

 

[Contraluz]

So why?

You might find some additional info in this recent thread:

https://dentallabnetwork.com/forums...dge-engaging-or-non-engaging-abutments.29058/

 

[sidesh0wb0b]

can always make both with an engaging hex, and the Dr can trim it off if need be.

 

[Adi]

can always make both with an engaging hex, and the Dr can trim it off if need be.

I don't think it will safe to do that, he will damage it.

 

[Adi]

You might find some additional info in this recent thread:

https://dentallabnetwork.com/forums...dge-engaging-or-non-engaging-abutments.29058/

Yes thank you, it helped a lot

 

[sidesh0wb0b]

I don't think it will safe to do that, he will damage it.

only for cases where its close to ideal path. done many this way, no issues. not all cases can be done like this