PubMed · 5268583
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1970. An improved Snyder Test.. https://pubmed.ncbi.nlm.nih.gov/5268583/
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The usefulness for staining of plaques on teeth was assessed using the preparation Carietest manufactured by Septodont. Carietest is a ready for use green fluid prepared, according to the producer, of blue sulphane and yellow tartrazin. It is applied painting the teeth in any area in which poor oral hygiene is suspected. The preparation was tried out using as reference standard Plakk-festö erythrosin tablets of Hungarian origin. The studied group comprised 25 patients. The range of staining of dental plaques by both preparations was determined using a simplified fuchsin index. The study showed a good suitability of the preparation Carietest for staining of bacterial dental plaques.
The reliability of different investigators' assessment distinguishing carious cavities from caries-free ones was examined in an in vitro study. In 23 recently extracted human teeth caries was completely removed by the principal investigator, while in 17 teeth caries was only incompletely removed. On two occasions at an interval of 2 weeks, 5 investigators established the diagnosis "carious" or "caries-free" after clinical inspection using probe and mirror. Decalcified thin sections were examined in order to determine objectively if a tooth was caries-free or not. On an average, 8 out of 10 carious and 6 out of 10 caries-free cavities were correctly diagnosed. An analysis of the erroneous diagnoses showed that it was deep interproximal lesions that went unnoticed most frequently. Lesions at the enamel-dentin junction were also overlooked. False positive diagnoses were three times more frequent than false negative results. The reliability of caries detection (sensitivity 83.5%) was far higher than reported in the literature.
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