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Medical Forum / General / Dentistry / August 200589.1% of FPD impressions had errors.
Quoting snippets from the online abstract Aug 2005 edition of JPD . Volume 94, Issue 2, Pages 112-117 (August 2005) A clinical evaluation of fixed partial denture impressions Material and methods A total of 193 FPD impressions were evaluated, immediately after arrival at 11 dental laboratories, by 3 calibrated examiners Results Of the impressions, 89.1% had 1 or more observable errors. Significant correlations were found between material type and voids or tears at the finish line (Rv=0.17, P<.025) and between material type and polymerization problems (Rv=0.223, P<.004). Conclusions Within the limitations of this study, impressions made with polyethers had the most detectable errors, followed by condensation-type silicones. The high frequency of detectable errors found in impressions sent for FPD fabrication is of concern. Reminds me of why I became a Denturist and possibly why Steve Mancuso is so fond of his CEREC  SignatureRoy rem NADA to reply We also need to add that working with patients can be difficult. Most of our impressions are quite adequate while some .... well, a disruptive patient, an overly active pain threshhold, well sometimes the impression that goes to the lab is the BEST THAT can be obtained. This is why we never criticize others' work. We were not there and did not observe under what condititons the work (or the impression) was performed. Joel SignatureJoel344 Let's also add that these are BRIDGE impressions ...... two or mor crowns as abutments spanning an edentulous (missing tooth) space. The missing tooth replacement is called the PONTIC, similar to the French word "le pont. -- Joel34 For those who want to know ...... THE TRICK to any clinical circumstance that defies obtaining an excellent impression is ..... TA Da ...... an annealed copper band! Joel SignatureJoel344 Good grief Joel, I haven't placed a copper band in 25 years! But I have one local friend who still uses them and you're right about how good they can be (in the right hands): literature has shown them to be potentially the least traumatic and very precise. My friend is veeeery OC. Good thing in a doc doing prostho . No surprises here. Two of my best friends are ceramometal techs - it's quite an adventure to hang out and look in the lab pans. I have noticed that the docs that do nice work always seem to do nice work. And the reverse. When asked how to pick a new dentist by a friend who is moving, I always say the same thing: check with a couple of dental labs. |
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