Another device based on the light-induced fluorescence phenomenon is the intraoral camera VistaProof (Dürr Dental, Bietigheim-Bissingen, Germany) (Figure 8) that is based on six blue GaN-LEDs emitting a 405-nm light. With this camera it is possible to digitize the video signal from the dental surface during fluorescence emission using a CCD sensor (chargecoupled device). On these images, it is possible to see different areas of the dental surface that fluoresce in green (sound dental tissue) and in red (carious dental tissue) (Thoms, 2006). DBSWIN software is used to analyze the images and translate into values the intensity ratio of the red and green fluorescence. According to the manufacturer, those values are related to the lesion extension. The higher is the bacterial colonization, the higher is the red fluorescent signal. The software highlights the lesions and classifies them in a scale from 0 to 5, giving a treatment orientation in the first evaluation: monitoring, remineralization or invasive treatment. However, these values still need to be adjusted (Rodrigues et al., 2008, 2011). Recently, this device showed a good performance in detecting and quantifying dental plaque formed over smooth surfaces under high exposition to sucrose (Raggio et al., 2010).
Fig. 8. (A) VistaProof fluorescence camera and DBSWIN software analysis. (B) Six blue LEDs emitting a 405-nm light.
An advantage of this method is that the patient can see in the computer screen the whole process of caries detection and visualize tooth areas where the disease shows more severe signals. This method makes easier the explanation to the patient concerning his/her clinical situation and possible available treatments. Besides, it is possible to monitor the caries lesion progression or arrestment overtime, as the images of the dental surfaces can be stored in the computer.
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