Evaluation of tooth wear by estimating enamel thickness with quantitative light-induced fluorescence technology

• Published in: Photodiagnosis and photodynamic therapy 2019-03, Vol.25, p.319-324
• Main Authors: Kim, Sang-Kyeom, Park, Seok-Woo, Lee, Hyung-Suk, Lee, Eun-Song, de Josselin de Jong, Elbert, Kim, Baek-Il
• Format: Article
• Language: English
• Subjects: Adult; Auto-fluorescence; Bicuspid; Dental Enamel - diagnostic imaging; Dental Enamel - pathology; Humans; Middle Aged; Molar; Occlusal wear; QLF; Quantitative light-induced fluorescence; Quantitative Light-Induced Fluorescence - methods; Quantitative Light-Induced Fluorescence - standards; Sensitivity and Specificity; Severity of Illness Index; Tooth Attrition - diagnostic imaging; Tooth Attrition - pathology; Tooth wear; Tooth Wear - diagnostic imaging; Tooth Wear - pathology; Young Adult
• ISSN: 1572-1000; 1873-1597
• DOI: 10.1016/j.pdpdt.2019.01.016

•Quantitative light-induced fluorescence was used to measure occlusal tooth wear.•As enamel thickness decreased, fluorescence parameters significantly increased.•Fluorescence parameters significantly differed among tooth wear index scores.•Fluorescence parameters correlated with both enamel thickness and tooth wear severity. Various techniques have been suggested to quantitatively assess tooth wear; most have limited clinical application. The first aim of this in vitro study was to estimate the residual enamel thickness of teeth with various degrees of occlusal wear using quantitative light-induced fluorescence (QLF). The second aim was to identify relationships between the fluorescence parameters of QLF and the conventional tooth wear index (TWI) system. Sixty-nine extracted permanent premolars and molars with initial stages of tooth wear (TWI score 1a-2: enamel wear to dentin exposure) were used. Two blinded and trained examiners participated in evaluation procedures. Occlusal QLF-digital (QLF-D) images were acquired for selecting area of interest (AOI) and calculating fluorescence for occlusal tooth wear (ΔFwear) of the AOI by the first examiner. Each specimen was cross-sectioned in the buccal-lingual direction. Enamel thickness from images obtained by stereomicroscopy and TWI of each sample was determined by the second examiner. Spearman correlation was used to determine the relationship of ΔFwear with enamel thickness and TWI. ΔFwear values were compared between histological scores with the Mann-Whitney U test. Seventy-six AOIs were analyzed. As enamel thickness decreased, ΔFwear values significantly increased and strongly correlated with enamel thickness (Spearman rho = -0.825, P