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Hello kent and everyone, I'm starting to hear about problems with zirconia abutments and fractures. I...See more need to look into it a bit more, I haven't had any of mine come back for a remake. It seems to me there would be more trouble with the solid zirconia v.s the Ti base. Monolithic screw retained may be the best way to go for posteriors, emax or zir as long as it has the Ti base. Any thoughts? Hey Kent, congrat's on the new position. — tagged Kent Kohli, CDT
Just participated in a digital forum at Whip Mix where Dr. Russell Giordano discussed the material science...See more and dynamics of Zirconia and Zirconia layering ceramics.... lots of "i's" and "t's" to dot and cross if you really want to ensure a scientifically sound interface between your Zr substrate and the Zr core... one thing he advocated in particular, and I know we have heard different variations on this from a variety of Zr and Zr layering mfg.s, but he stated quite emphatically, that anytime one introduces stress (grinding and/or finishing of Zr frames and full-contour Zr restorations) that a 'conditioning firing' is imperative! This conditioning firing consists of running the Zr frame up to 1000 C and holding it for a minimum of 15-20 mins., then a slow cool coming down- not 1-2 mins., but a REAL slow cool down to a min. temp of 600 C... then bench cool down to room temp. If one doesn't observe this conditioning cycle, the Zr will remain in a Monoclinic 'stressed' state and not return to a tetragonal/metastable state! That is to say, if a crack starts to propagate, it will not necessarily force the crack together, thus stopping it or encapsulating it. What this could spell for us is short-term, false-sensed "success..." OR LONGTERM Failure, depending upon one's mindset... Noritake & Vita were proponents of this necessary cycle long before others joined the band wagon... — tagged Whip Mix Corp.
Just curious what everyone's thoughts are on screw-retained, full contour, hybrid Zr bridges? How many...See more of us are doing full-arch reconstructions? How about full-mouth, all in protected, full-contour Zr? That is to say, full Zr occlusals (posteriors) and lingual/incisal edge protection (anteriors?) What have been your experiences? Long-term experiences especially...
Kent Kohli, CDT · Dental Technician/Educator at Kent D. Kohli, CDT
My fellow technicians, anyone interested in collaborating with like-minded professionals from the lab...See more industry and clinical industry should consider this program. Many of us complain that there isn't enough collaborative educational opportunities to elevate ourselves in our clinical peers' eyes... well, this one is slated to be great! AND, it's absolutely free admittance to the laboratory profession at large. If you're well on your way into the digital age of dentistry, cautiously considering it or not sure... join our professional partners and explore the possibilities...!!!