Abstract
To facilitate the diagnosis of early caries, a laser fluorescence system (Diagnodent™) was developed. The aim of this in vitro study was to investigate the reproducibility of measurements due to polishing of the tooth surface and calibration of the instrument. In this study, 35 extracted molars with visually intact surfaces were used for two series of measurements at 181 occlusal spots. Before starting the measurements, standardised calibration was performed and repeated just before every measurement of a new sample. The measurements were repeated after individual calibration of the laser system. A second series of measurements was performed after polishing the occlusal surface. The measuring protocol was identical to the first series concerning calibration procedures. Plaque removal had no relevant influence on the results. Calibration procedures, however, change the Diagnodent™ readings significantly.
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