Barium sulfate question-urgent

[subrisi]

Hi,
I have to make a surgical guide ( it will only be used for a cad cam image) and need to mix Barium sulfate into the clear acrylic. What is the mixing ratio?
I need an answer quick please
Thanks

 

[TheLabGuy]

The manufacturers sell teeth with 10% and 30% if that's any help.

 

[toothdesigner]

simplant recommends 1 part barrium to 6 parts resin if you use there powdered barrium

 

[subrisi]

Thanks That will do. Sorry for the double posting

 

[kcdt]

There's a number of suppliers now that offer pre-mixed polymer/BS in set ratios. Might be less hassle than mixing your own.

 

[toothdesigner]

if ur making a scan denture the recomended ratio 1 part barrium to 6 part resin. the ratio for the pallate is 1 part barrium 10 parts resin. to show the differance between teeth and pallate.

 

[toothdesigner]

if you are making a c/t scan stent for a partially edentulous pt. liquid barrium is used either painted on the external surface covered with rocket cynacrolate or mixed in the resin as simplant uses inside tyhe stent

 

[Mark Jackson]

The ratio depands on the planning software being used, the scanner being used, and the type of surgical guide being made. As a rule, dual gradient scanning appliances are only done on tissue supported guides, and single gradient is used on bone supported guides.

If the planning software used a dual scan, then you use gutta percha instead of barium, and if the software is the fast track type, no barium is used at all. If the scanner is a Sirona or a Hitachi, you can't use barium, and should use soda glass beads.

I think you (or we) need more information. Otherwise you may subject the patient to unnecessary radiation by making them get a new scan with the right appliance!!

 

[lcmlabforum]

Mark is right. If the surgeon later decides on NobelGuide, you might
have to do it all over again! They have strict protocol even for the
'bite' material and size of their gutta percha markers.
Fortunately or otherwise, nothing is 'Just a . . .' or 'only' nowadays.
Not beating on you, just that the prescription from the dentist should
have probably been little more specific.
LCM

 

[Lab One]

Yes, and you should use medical grade baruim. Some other grades are rather grainy in texture and create a speckled appliance after processing.

 

[Mark Jackson]

Yes, and you should use medical grade baruim. Some other grades are rather grainy in texture and create a speckled appliance after processing.

The problem is that the barium has a different specific gravity from the acrylic, and therefore, they will not mix and evenly distribute particles. You can ball mill them together, but the best way is to use ScanAcryl, which as designed just for this purpose, and available premixed in the right gradients.

We sell it here, along with soda glass beads, toggles, plates and other radiographic supplies: 800-223-6322

 

[TomZ]

Thats Scanocryl

 

[lcmlabforum]

I have ordered and use that, much easier than trying to mix your own.
I got it through Mark, but think it was manufactured by Keystone or someone
else (Was that not Tom Z?). It did still take longer to set, even with Super-T
liquid.
LCM

 

[capickettcdt]

Dang that Mark is good!!