The aim of the study was to assess the ability of a fluorescence based optical system to detect
The optical detecting system (VistaProof) illuminates the tooth surfaces with blue light
emitted by high power GaN-LEDs at 405 nm. Employing this almost monochromatic
excitation, fluorescence is analyzed using a RGB camera chip and encoded in color
graduations (blue - red - orange - yellow) by a software (DBSWIN), indicating the degree of
caries destruction. 31 freshly extracted teeth with existing fillings and secondary caries were
cleaned, excavated and refilled with the same kind of restorative material. 19 of them were
refilled with amalgam, 12 were refilled with a composite resin. Each step was analyzed with
the respective software and analyzed statistically. Differences were considered as statistically
significant at p<0.05.
There was no difference between measurements at baseline and after cleaning (Mann
Whitney, p>0.05). There was a significant difference between baseline measurements of the
teeth primarily filled with composite resins and the refilled situation (p=0.014). There was
also a significant difference between the non-excavated and the excavated group (Composite
p=0.006, Amalgam p=0.018).
The in vitro study showed, that the fluorescence based system allows detecting secondary
caries next to composite resin fillings but not next to amalgam restorations. Cleaning of the
teeth is not necessary, if there is no visible plaque. Further studies have to show, whether the
system shows the same promising results in vivo.