Application of Quantitative Light-induced Fluorescence for Assessment of the Effect of Fluoride on Remineralization

Abstract

The purpose of this study was to confirm the reliability of Quantitative light-induced fluorescence (QLF) method compared to Micro Radiograph (MR) method in determining the effect of fluoride on the remineralization of decalcified bovine and human permanent teeth.
The items measured were ΔZ: mineral loss in the MR method, ΔF: average fluorescence loss, area: lesion size and ΔQ: fluorescence loss integrated over the lesion size in the QLF method. The demineralized bovine tooth specimens were immersed in remineralization solution for 25 days, and the degree of remineralization in the fluoride coating group (FV group) and the non coating group (control group) was compared using QLF. The effect of topical application of fluoride and fluoride mouth rinsing on the remineralization of white spots on human permanent teeth in the oral cavity was also examined
The results obtained were as follows.
1. There was a significant correlation between the values of ΔZ in the MR method and those of ΔF in the QLF method.
2. The remineralization of bovine tooth in the FV group was greater than that in the control group. After 25 days, the recovery factor (ΔF) of the control group was 7.7±2.9%, while that of the FV group was 18.0±3.4%.
3. Regarding the white spots in the oral cavity, the QLF value indicated that remineralization continued even after 2 months, and the average recovery factor was 19.9±5.9%