Sinter beads or not?

user name

user name

Well-Known Member
Full Member
Messages
6,960
Reaction score
1,633
Im curious. Dekema oven has both a tray to use with sinter beads, and a newer tray material that doesnt use beads; apparently no drops either. Just set the units on the tray. Good, bad?
 
DevonR

DevonR

Active Member
Full Member
Messages
514
Reaction score
77
ZirkonZahn has been using a beadless tray since the beginning. We never had any problems. However, I only use it with ZirkonZahn zirconia... I have tried other zirconia materials and have gotten a crack here and there.
 
Techy

Techy

Active Member
Full Member
Messages
183
Reaction score
8
For the price of some beads,,I would use them, if anything will only aid in the process. (shrink rate)
 
Axis Dental Milling

Axis Dental Milling

Active Member
Full Member
Messages
192
Reaction score
32
Use your sintering beads, when the units shrink the 20 to 25% they will help out with rolling the units and wont create friction and have the units hang up.
 
rc75

rc75

Well-Known Member
Sponsors
Full Member
Messages
2,341
Reaction score
355
We sell 200 grams of 1mm or 2mm beads for $30 if anyone is interested.
 
CoolHandLuke

CoolHandLuke

Idiot
Full Member
Messages
10,078
Solutions
1
Reaction score
1,411
user, your beads eventually will become unuseable. either they will stick to the tray or will get discolored and discolor your product. change them every couple months.
 
KentPWalton

KentPWalton

Well-Known Member
Full Member
Messages
1,789
Reaction score
265
It's less surface area for the Zirconia to be against as they shrink, and easy for them

to move as they do shrink. I agree with Luke, change them out every couple of months.
 
Brent Harvey

Brent Harvey

Well-Known Member
Full Member
Messages
411
Reaction score
188
Yes i have talked to many labs that say they have used with and without Beads and Many (as in %95) go back to using beads as they like the Consistent results that it brings. However as Kent and CoolHand said change the beads out every couple of months as they Will discolor your Zirconia. I also recommend when you change out your beads, also purge your Oven to suck the contaminants from your muffle - (I can give you instructions on how to do that if needed)
 
user name

user name

Well-Known Member
Full Member
Messages
6,960
Reaction score
1,633
We sell 200 grams of 1mm or 2mm beads for $30 if anyone is interested.
What are sinter beads made of? Are some inferior to others? Why such a huge price difference between brands? Why two different sizes?
 
rc75

rc75

Well-Known Member
Sponsors
Full Member
Messages
2,341
Reaction score
355
What are sinter beads made of? Are some inferior to others? Why such a huge price difference between brands? Why two different sizes?

As far as I know our sintering beads are made from zirconia. Why the different sizes? That's a great question I believe it's all personal preference.
 
Axis Dental Milling

Axis Dental Milling

Active Member
Full Member
Messages
192
Reaction score
32
I like big balls Bird yes I know I left that open for y'all to crack jokes so go ahead but I like the bigger ones. They don't get stuck in the secondary anatomy when the FCZ units are shrinking during the sintering process.
 
Brent Harvey

Brent Harvey

Well-Known Member
Full Member
Messages
411
Reaction score
188
What are sinter beads made of? Are some inferior to others? Why such a huge price difference between brands? Why two different sizes?

There are two types, alumina beads and zirconia beads. Alumina beads work but not as well as the zirconia beads. There are 2 different ways of making the zirconia beads. From these two methods, there are either pearly beads or chalky beads. If you are using white zirconia, either bead type will usually work just fine. However I have heard that if you are sintering shaded zirconia you must use pearly beads to keep the zirconia from forming white spots. For some reason the chalky beads seem to absorb into the colored zirconia, causing white spots. While some people have told me they have had no problems with using chalky beads and shaded zirconia together, many labs have.

Smaller 0.5mm beads are good for bridges as they give you even sintering. The 2mm can be used for any restoration.

Price difference depends on the purity level of the zirconia sintering beads. The more pure the more expensive they tend to be.

Hope this helps. If you like, call me and I can provide more details over the phone.
 
JohnWilson

JohnWilson

Well-Known Member
Full Member
Messages
5,487
Reaction score
1,575
For guys wondering about beads or not, I have sinterd a TON of units and do not use any beads. I have a plate :)
 
Affinity

Affinity

Well-Known Member
Donator
Full Member
Messages
6,918
Reaction score
1,062
a zirconia plate?
 
L

labtek

Active Member
Full Member
Messages
279
Reaction score
16
Its an alumina plate that is included with the ovens I have.

http://thermo-star.de/tl_files/docs/Ersatzteile/M2plus - BHM (de en).pdf


John,
Can you provide more details about your process with this alumina plate. It appears as though the sintering beads get contaminated and then we have to throw the whole batch out and start with more. It is usually after the spots appear that this happens, so is there a protocol to when one should change the beads?
IF you are still not using beads, do you change out your plate or do a degassing program to clean it up? Do you lay your crowns on the tray with the margins up or margins down? Can we just skip the beads and fire directly on our firing crucible/bowl.
 
JohnWilson

JohnWilson

Well-Known Member
Full Member
Messages
5,487
Reaction score
1,575
John,
Can you provide more details about your process with this alumina plate. It appears as though the sintering beads get contaminated and then we have to throw the whole batch out and start with more. It is usually after the spots appear that this happens, so is there a protocol to when one should change the beads?
IF you are still not using beads, do you change out your plate or do a degassing program to clean it up? Do you lay your crowns on the tray with the margins up or margins down? Can we just skip the beads and fire directly on our firing crucible/bowl.

Yes margins up is how I do it IMG_0510.JPG
 
Car 54

Car 54

Well-Known Member
Donator
Full Member
Messages
7,974
Reaction score
1,122
For an incredible amount of money you could pay ~$250.00 for the smaller beadles one Ivoclar uses with their S1 ovens? They're very fragile, and can break easily if you're not careful with them...don't ask me how I know :rolleyes::eek:
 

Similar threads

I
Replies
17
Views
289
Flipperlady
Flipperlady
C
Replies
9
Views
721
desertfox384
desertfox384
D
Replies
20
Views
1K
GG - J
GG - J
Top Bottom