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The influence of zero value subtraction on the performance of a new laser fluorescence device for approximal caries detection

de Almeida Rodrigues, Jonas ; Hug, Isabel ; Lussi, Adrian

In: Lasers in Medical Science, 2009, vol. 24, no. 3, p. 301-306

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    Title
    • The influence of zero value subtraction on the performance of a new laser fluorescence device for approximal caries detection
    Author
    • de Almeida Rodrigues, Jonas. Department of Preventive Restorative and Pediatric Dentistry, School of Dental Medicine, University of Bern, Freiburgstrasse 7, CH 3010, Bern, Switzerland
    • Hug, Isabel. Department of Preventive Restorative and Pediatric Dentistry, School of Dental Medicine, University of Bern, Freiburgstrasse 7, CH 3010, Bern, Switzerland
    • Lussi, Adrian. Department of Preventive Restorative and Pediatric Dentistry, School of Dental Medicine, University of Bern, Freiburgstrasse 7, CH 3010, Bern, Switzerland
    Document Type
    • Postprint
    OAI-PMH Identifier
    • oai:doc.rero.ch:314939
    Summary
    The aim of this study was to assess the influence of the zero value subtraction on the performance of laser fluorescence (LFpen) for approximal caries detection. Three areas (cuspal, middle and cervical) of both mesial and distal buccal surfaces of 78 permanent molars were assessed using both wedge-shaped (WDG) and tapered wedge-shaped (TWDG) tips. With the addition of the average, one cut-off value for each area was obtained and the performance was assessed. The areas under the receiver operating characteristics (ROC) curve, specificity, sensitivity and accuracy with and without the zero value subtraction were calculated. The McNemar test revealed a statistically significant difference for specificity at thresholds D1, D2 and D3 (WDG) and D1 and D2 (TWDG) when the zero value subtraction was not performed. Influence of the zero value subtraction on the LFpen performance was observed for approximal caries detection. However, when modified cut-off values were used, the zero value subtraction could be eliminated