fracture in FC zirconia

[amer84]

hey
I had made an 8 unit bridge by using prettau blanck of zirconzahn
after I finished the glaze circle it broken into tow pieces !!!
I made it again but it broken in the same area during finishing the zirconia
:frusty:

plz tell me what is the problem :hail:? i'm making it the thired time now I placeing it with stabilizer and incrase tha connector thickness

 

[ice_pascu]

you are sintering with the work standing up?

 

[amer84]

sorry photos not show up what the problem??

 

[ice_pascu]

You can try:
1.sinter the zirconia work standing up
2.use a bigger sintering program(we use a 12H program for big jobs,3h at maxim temp.)
3.increases the connector thickness

 

[DMC]

The bottom of your sintering tray has some exposed areas to heat up at same rate as the Zirconia on top?

We use spacer under the tray to raise up in the middle of furnace chamber, also have exposed bottom of tray so haet can make it evenly to bottom of tray as well.

You maybe need slower heat ramp up and down. Probably a stress crack from the uneven temps of the bridge and the center area yo have it attached to?

Is possible?

Your bridge was flat, or standing up on back edge of your stabilizer?

 

[corona]

if i understand amer right .... everything was fine until AFTER you glazed the bridge ??? if that is so then i would suggest what Mark said ..... its gotta be your ramp in and ramp out . youve got to slowwwwwwwwwwww in and slowwwwwww out a bridge with a zir. weight of that magnitude ... remember ... the more the zirconia weights in grams the slower you have to raise the temp in degrees per minute .

corona .

 

[DMC]

The bridge in the pic is not glazed.

It is his sintering technique and/or sintering parameters.

Marq Jakson

 

[corona]

The bridge in the pic is not glazed.

It is his sintering technique and/or sintering parameters.

Marq Jakson

Will the real slim Mark Shadey Jackson please stand up !!! Holy crap ... i think *** has milled a Mark Jackson .... did you use the Haas ?? or some other new gizmo youve invented ???

 

[disturbed]

You can try:
1.sinter the zirconia work standing up
2.use a bigger sintering program(we use a 12H program for big jobs,3h at maxim temp.)
3.increases the connector thickness

4.use high nobel metal and layer some vitality into it...

 

[ed 3]

4.use high nobel metal and layer some vitality into it...

LOL sintering- shmintering. Hey disturbed, let kids reinvent the wheel. The only one thing no one can make stone look like a real thing.))

 

[Sevan P]

All the long span bridges I have sintered have stood up on the flat end of the stabilizer brace and only have the sprues from the bridge to the stabilizer bar only on the abutments not the pontics unless you have a 6 unit with only two abutments then one or two on the central pontics, no need for overkill like you have, I have actually had that interfere and cause the bridge not to seat. Judging the look of your bridge you will only need 4 sprues on the lingual side and maybe 4-5 on the facial side no more.

Also did you grind down the extra ZR between the teeth on the lingual side? pre sintered of post sintering did you reduce? You should never or try no not to reduce the joints at all.if needed very minimal. But also have to go with *** what is your sintering program setup as? You need to do a long fire, your longbridge mode takes 14hours to complete. Your standard 8 hour cycle can cause issues.

Sevan

 

[amer84]

The bridge in the pic is not glazed.

It is his sintering technique and/or sintering parameters.

Marq Jakson

the first bridge I'd made was broken after glazing
its behind the sintered one
the second broke after sintring
it's simply chipped away
during I trimming it although I put it stood up on flat side but it broken down
I will incrasing theckness of connector and tray slow sintering and glaze circl
I hope it will work
thanks evry body:biggrin:

 

[rkm rdt]

4.use high nobel metal and layer some vitality into it...

Do you know how much gold costs in Syria these days?

 

[Gdentallab]

Do you know how much gold costs in Syria these days?

I think the price of gold is somehow the same everywhere. you'd rather ask how much the technician delivers the restoration (gold or Zr) to his account...

 

[rkm rdt]

I think there's a war going on over there. I could be wrong but I bet there is a bigger markup.

 

[lcmlabforum]

Sometimes bad things happen for a good reason. Maybe it might fit better if
you split the pattern instead of hoping such a long span with multiple abutments
will seat fully as a single unit in the first place.
Peace be with you in such times of strive around you.
LCM

 

[rkm rdt]

Sometimes bad things happen for a good reason. Maybe it might fit better if
you split the pattern instead of hoping such a long span with multiple abutments
will seat fully as a single unit in the first place.
Peace be with you in such times of strive around you.
LCM

I was thinking the same thing. Maybe 2 pieces is just as good if not better ?

 

[bonded]

Hi Amer ,
You have to be so sensitive with zirconia when u trimming don't over heat it and use water when u grinding,
* setup ur furnace slow heat rate 30 degree and start temp.( preheat ) from 300 degree for big bridges
* slow cooling try to setup ur open temp. as low as u can or if u cannot do it manually !!
and last thing contact ur company zirkonzahn will help you as well .
hope u do better and Good luck

 

[Macron Dental Lab]

hey
I had made an 8 unit bridge by using prettau blanck of zirconzahn
after I finished the glaze circle it broken into tow pieces !!!
I made it again but it broken in the same area during finishing the zirconia
:frusty:

plz tell me what is the problem :hail:? i'm making it the thired time now I placeing it with stabilizer and incrase tha connector thickness

View attachment 3945

View attachment 3946

View attachment 3947

wow no good this is my first full zir bridge 12 units , email me and i will sent you a guide how to and do not to

http://media.merchantcircle.com/18033134/20120420_155904_full.jpeg

 

[Broadway your way]

It is best if you don't use so many bars and less massive bar!

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