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A fast and reliable method for semi-automated planimetric quantification of dental plaque in clinical trials.

AIM
This study developed a simple, reproducible method for semiautomated planimetric quantification of dental plaque.


MATERIALS AND METHODS
Plaque from 20 healthy volunteers was disclosed using erythrosine, and fluorescence images of the first incisors, first premolars and first molars were recorded after 1, 7 and 14 days of de novo plaque formation. The planimetric plaque index (PPI) was determined using a semi-automated threshold-based image segmentation algorithm and compared to manually determined PPI and the Turesky modification of the Quigley-Hein plaque index (TM-QHPI). The decrease of tooth autofluorescence in plaque-covered areas was quantified as an index of plaque thickness (TI). Data were analyzed by ANOVA and Pearson correlations.


RESULTS
The high contrast between teeth, disclosed plaque, and soft tissues in fluorescence images allowed for a fast threshold-based image segmentation. Semi-automated PPI strongly correlated with manual planimetry (r=0.92; P<.001) and TM-QHPI recordings (r=0.88; P<.001), and it may exhibit a higher discriminatory power than TM-QHPI due to its continuous scale. TI values corresponded to optically perceived plaque thickness, and no differences were observed over time (P>0.05, ANOVA).


CONCLUSION
The proposed semi-automated planimetric analysis based on fluorescence images is a simple and efficient method for dental plaque quantification in multiple images with reduced human input. This article is protected by copyright. All rights reserved.