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Jeff Blank on Prehybridization

October 26th, 2005 · No Comments

I’m attaching the preview of the abstract submitted for IADR approval (not yet accepted). We tested more groups than what is presented in the abstract submission (long story my co-authors wife had a grand mal seizure and has been diagnosed with an operable brain tumor but needless to say we took a time out trying to get this abstract submitted). We hoped to put just enough in this abstract to get approval and will present the other groups in similar fashion at the IADR. My findings with Temp Bond Clear were a sidebar. We were not testing Temp Bond Clear. We were testing prehybridization under the clinical scenario that I use everyday in my practice.

We ground teeth to dentin, prehybridized (this is a bad term by the way) with 3 products (only 2 submitted in this rudimentary abstract), used ethanol to remove the air inhibited layer (a must by the way), took a polyvinyl impression (covered the specimens in Aquasil Ultra), allow it to set, temporized by cementing Integrity discs onto the specimens. We used Dycal and Temp Bond Clear (Kerr) because these are the 2 most common temp cements I use in my practice (no other reason).

Our positive control was prep, no prehybrid, impress, Integrity provisional with dycal and Temp Bond Clear.

We then thermocylced for 5 weeks (it was supposed to be 3 weeks but then Marks wife took precedence), removed the temps. We then bonded Empress I discs using a total etch product, and 3 self etch systems (one was an experimental yet named).
 
As you can see, this data supports prehybridization per se. I appalled at the lack of scientific studies using similar protocols (i.e. crown and bridge applications) and yet so many gurus are advocating it. But nonetheless it appears a viable technique based on this very limited in vitro study. Hope this will spike a run in studies with larger sample sizes etc., but hey I’m a private practitioner just trying to set the wheels in motion.
 
My comments on Temp Bond Clear reducing bond strengths came from the fact that even in the positive controlbond strengths were reduced. Same occurred in the prehybridization test groups. How significant a reduction? Mark still has to do that Tukey test randomization math crap. But note our conclusion.. (TB is Temp Bond Clear not temp bond Ne) this is a typo.
 
One thing we did learn….getting the temps cemented with Temp Bond Clear off the prehybridized group was a bitch. And these were just flat discs. Since TBC is obviously a resin cement system one could deduce that it will stick to the prehybridized layer!!!

So we discovered more questions than we answered. But things we need to know.
 
Jeff T. Blank, DMD, PA

Tags: Dental Materials · Uncategorized

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