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Dental caries are one of the most important problems in world health care. Fortunately in the last decades its rates have considerably decreased. This could be explained by the increased level of fluoride in drinking water, toothpaste and mouth rinse as well as the improvement in society’s hygiene 1-4. With the increasing consciousness of people toward their oral and dental hygiene, expectancies from the dentist for early caries detection has grew. On the other hand it has been proven that the local equal application of fluoride has no effect on all dental surfaces and doesn’t lead to reduction of caries in dental fissures, in such a way that occlusal caries constitutes more than 90% of caries in children 5,6.  

In addition researches have showed that caries detection in pits and fissures is harder. One of the reason mentioned, is the insolubility of the enamel reinforced by fluoride at the dental surface which results in no observation of decay in it, while in the layer beneath there might be some caries 5,7,8. Also, different organizations and institutions have mentioned reasons such as technology progress and decay detection equipment, which even capable of detecting caries in their initial stages. This resulted in less expense for patients and considerable improvement in tooth life span.

DIAGNOdent is used as a complementary tool beside visual examination for diagnosis of occlusal caries. DIAGNOdent decay detection is based on the principle that when Diode laser with 655nm wavelength is irradiated on dental surface, it is absorbed by metabolites of intraoral bacteria and these metabolites emit a red fluorescence. 

This fluorescence reflected by the dental surface is indicated as a number between 0 and 99 on the screen of the device. Greater numbers are an indication of a greater decay area. Therefore Laser fluorescence provides a quantitative and non-invasive method for the diagnosis of dental caries 16-18. Although DIAGNOdent is considered a valuable tool in the diagnosis of decay, there are some concerns existing regarding its accuracy, for instance, there is no relation between the number showed by the DIAGNOdent and depth of decay 19.








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