Just thought I'd pass this along to everyone:
Recently I saw a lady who returned to my practice after 2 years away. When I examined her, there were 5 areas where the Diagnodent was >=30, but 3 of them didn't LOOK like carious areas. I was suspicious. Part of the reason I was suspicious was that the low battery light was blinking on the DD.
Well, she wanted all 5 restorations done at one time, so she came in this morning to do them, but before I got started, I decided to AA the areas and recheck with DD. The 3 that I was more suspicious about had DD <=10 now, and I think it had way more to do with the batteries than the AA, because the other lesions were similar to how they presented the first day even after AA, and they did have confirmed caries, albeit minimal caries.
Bottom line is: Do not trust a DD unit when the battery light is flashing. Replace the batteries immediately, recalibrate, and then remeasure, especially if clinical appearance and the DD do not seem to correlate.
So many times, I use that DD and it is RIGHT when my eyes would disagree. In this case, my eyes and spider senses were right. Use both.
WWTW
--David R. Boag, DDS
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