Optimal Camera and Illumination Angulations for Detection of Interproximal Caries Using Quantitative Light-Induced FluorescenceBuchalla W.a,b · Lennon Á.M.a,b · van der Veen M.H.c,d · Stookey G.K.a
aDepartment of Preventive and Community Dentistry, Oral Health Research Institute, Indiana University School of Dentistry, Indianapolis, Ind., USA; bDepartment of Conservative Dentistry, Preventive Dentistry, and Periodontology, Georg August University Göttingen, Germany; cACTA, Department of Cariology, Endodontology and Pedodontology, and dInspektor Research Systems BV, Amsterdam, The Netherlands
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The aim of the study was to find the optimal illumination and camera angulations for interproximal use of quantitative light-induced fluorescence (QLF). A multiaxis optical bench was developed and interproximal tooth assemblies were investigated using a modified version of QLF. Extracted human premolars without caries (n = 8) and with interproximal D1, D2 and D3 caries (n = 20) were selected. Tooth-pair models without caries and with interproximal caries of matching size, location, and shape were imaged with varying camera and illumination directions from buccal (0°) to occlusal (90°) to lingual (180°) in steps of 30° using a PC and framegrabber and examined for observed presence. Interproximal lesions could be detected in all teeth, but observed presence was dependent on camera angulation (p < 0.05), rather than on illumination angulation (p = 0.32). No caries could be detected with the camera in the 90° position.
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