bonding composite to acrylic

[paulg100]

Ok have a q that i cant seem to find much info on at the minute. (ill checking me books).

Been playing around with acrylic tempories for a while and one thing cleints need to do is add composite to them intra orally to sculpt soft tissue etc.

So the question is, can anyone recommend the best way of bonding composite to acrylic and will the bond be strong enough to last for long term implant temps (baring in mind the composite is being added under pontics etc so no load as such) ??

The reason why i am prefering acrylic for this is that i can wax up, make a putty index and inject, rather than having to build composite.

thanks.

 

[rkm rdt]

The bonding surface must be clean and unpolished.That's basically all you have to provide.The Dr can bond to acrylic quite easily with most of their direct composites.

Have you worked with Triad?

Personally I am finding the pmma material to be the best for this application.

 

[paulg100]

i guess if he has a co jet or somthing to blast the acrylic surface first then that would be ideal.

Nope never tried triad.

i just starting buying the optident acrylics a while back, its what Oliver Brix uses in his book fundamentals of aesthetics, and im pretty much using the trechnique and protocols from there.

Did try using the Telio Cad stuff originally but you need a pot that will hold pressure and temp for it to cure. My pot isnt heated and i couldnt get it to cure. Didnt really fancy spending a grand on a fancy pot at the moment!.

Ive played around with the Machinable Polymers on the inlab system, Vita CadTemp and Ivoclar Telio cad. Unfortuantly the burs clog when milling wax or plastics so it was a waste of time. Ive seen a number of lectures now reporting the benefits of such a dense composite, for tissue response and stain resistance, so its a shame.

 

[rkm rdt]

Check out my thread "pmma temp bridge"...

I'm probably pushing the envelope with this mat'l as others have posted there but I think there are some excellent options for this stuff.

There is also another mat'l coming out soon (i am told)that will be as strong as zr but with some flexibilities.

 

[CoolHandLuke]

there exists a PMMA that i only know called "Best PMMA" which kinda sounds russian (Russian PMMA is Best PMMA) but i really have no idea. the samples we received and the sales pitch we were thrown was "its as durable as titanium, and as millable as pmma, and as lightweight as zirconia"

for the life of me however, theres no packaging with labels so i can find it on the interwebz. i can't reliably say theres any truth to this claim, as i have yet to come up with a case for it, or the tools with which to carve this puck.

 

[rkm rdt]

there exists a PMMA that i only know called "Best PMMA" which kinda sounds russian (Russian PMMA is Best PMMA) but i really have no idea. the samples we received and the sales pitch we were thrown was "its as durable as titanium, and as millable as pmma, and as lightweight as zirconia"

for the life of me however, theres no packaging with labels so i can find it on the interwebz. i can't reliably say theres any truth to this claim, as i have yet to come up with a case for it, or the tools with which to carve this puck.

Sounds like PEEK.

 

[Rick Sonntag]

GC Composite Primer is ideal for bonding acrylic to composite.

http://www.gcamerica.com/lab/products/GRADIA_gum_shades/article-GradiaGum_Gradia.pdf

 

[paulg100]

thanks for the info.

i think most composite kits come with a primer for add ons, so there should be one in the docs kit all ready.

I doubt if applying it labside would be that effective once the unit is placed and then added onto after 2 months.