Caries detector dyes - an in vitro assessment of some new compounds

Previous studies have shown that the caries detector dyes, basic fuchsin an d acid red, lack specificity. Accordingly, their clinical use can lead to t he unnecessary removal of sound tissue. In the present study, the specifici ty of three further dyes, Carbolan Green, Coomassie Blue and Lissamine Blue was studied. Carious dentine was removed in vitro by means of rotary instr uments until the cavities were deemed caries free by conventional clinical criteria. Experimental dyes were applied to the cavity floors, all of which became stained. Stained dentine was removed from half the cavity by means of a burr, the other half remaining as a control. Further stain was then ap plied and the procedure repeated until no further reduction of the staining of the cavity floor could be achieved. Light microscopy of ground sections of experimental teeth showed that sound tissue had been removed unnecessar ily from the experimental half of the cavity due to the lack of specificity of these dyes. This lack of specificity of staining was similar to basic f uchsin and acid red. Only Carbolan Green showed possible differential stain ing between control and experimental sites, but this was not caries specifi c. If a clinically useful dye is to be developed, it would need to specific ally stain either bacteria in infected dentine and/or the carious degradati on products of dentine matrix.