This study aimed to evaluate the ability of quantitative light-induced fluorescence (QLF) to assess caries lesion activity using visual examination (VE) as the gold standard. Twenty-four visible white spot lesions on buccal surfaces were examined from 23 children, ages 9 to 14 years. At baseline, the surface was hydrated with water, and thereafter, it was dehydrated with continuous compressed air during image acquisition. QLF images were acquired at 0 (baseline), 5, and 15 s. QLF variables [QLFV: Fluorescence loss (ΔF), lesion size (S), ΔQ: ΔF × S] was recorded. Changes-in-QLFV per second (ΔQLFV) were determined: ΔQLFV = (QLFVN - QLFVBaseline)/N, where N indicates dehydration time. One experienced dentist conducted VE independently using a dental unit's light, compressed air, and explorer. QLFV and ΔQLFV of the active group (n = 11) were compared with those of the inactive group (n = 13) using two-sample t -tests. As the surface was dehydrated, S and ΔQ values of the active group increased, whereas QLFV of the inactive group showed only a small change. ΔQLFV of the active group were larger than those of the inactive group; however, the difference did not reach statistical significance (p > 0.11). Within the limitations of this study, QLF data indicated increments for lesions designated as active and minimal change for lesions defined as inactive.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Atomic and Molecular Physics, and Optics
- Biomedical Engineering