title: Evaluation of resin infiltration using quantitative light-induced fluorescence technology.
abstract: OBJECTIVE
  To determine whether quantitative light-induced fluorescence (QLF) technology can be used to classify the colour of teeth specimens before and after resin infiltration (RI) treatment, and calculate the correlation between the ΔF value and colour difference (ΔE) in fluorescence images of the specimens obtained using a QLF-digital (QLF-D) device.
  
  
  METHODS
  Sixty sound bovine permanent teeth specimens were immersed in demineralized solution. Two exposed windows were formed in each specimen, and RI treatment was applied to one of them. The ΔE values were obtained for the differences between a sound tooth surface (SS), an early dental caries surface (ECS) and an ECS treated with RI (RS) in white-light and fluorescence images obtained using QLF-D, respectively. The ΔF value was obtained from fluorescence images using dedicated software for QLF-D. The mean differences between the ΔE values obtained from the white-light and fluorescence images were analyzed by paired t-test. Pearson correlation analysis and Bland-Altman plots were applied to the differences between the ΔF value for ECS (ΔFSS-ECS) and the ΔE value between SS and ECS (ΔESS-ECS), and between the ΔF value for RS (ΔFSS-RS) and the ΔE value between SS and RS (ΔESS-RS) in fluorescence images.
  
  
  RESULTS
  The ΔE values obtained from fluorescence images were three times higher than the ΔE values obtained from white-light images (p<0.001). Significant correlations were confirmed between ΔESS-ECS and ΔFSS-ECS (r=-0.492, p<0.001) and between ΔESS-RS and ΔFSS-RS (r=-0.661, p<0.001).
  
  
  CONCLUSIONS
  QLF technology can be used to confirm the presence of RI in teeth.
authors.affiliation: Department of Dental Hygiene, College of Health Sciences, Cheongju University, Cheongju, South Korea.
authors.forename: Ji-Hyun
authors.initials: JH
authors.lastname: Min
authors.affiliation: Department of Preventive Dentistry, Iwate Medical University School of Dentistry, Morioka, Japan.
authors.forename: Daisuke
authors.initials: D
authors.lastname: Inaba
authors.affiliation: Department of Preventive Dentistry & Public Oral Health, BK21 PLUS Project, Oral Science Research Institute, Yonsei University College of Dentistry, Seoul, South Korea; Department of Orofacial Pain & Oral Medicine, Yonsei University College of Dentistry, South Korea. Electronic address: drkbi@yuhs.ac.
authors.forename: Baek-Il
authors.initials: BI
authors.lastname: Kim
mesh_terms: D065966:Absorption, Physicochemical; D000818:Animals; D002417:Cattle; D003124:Colorimetry / Q000379:methods*; D003731:Dental Caries / Q000000981:diagnostic imaging* / Q000378:metabolism / Q000628:therapy; D003732:Dental Caries Activity Tests / Q000379:methods*; D004307:Dose-Response Relationship, Radiation; D005453:Fluorescence; D066298:In Vitro Techniques; D008029:Lighting; D008856:Microscopy, Fluorescence / Q000379:methods*; D023861:Photography, Dental / Q000379:methods; D011829:Radiation Dosage; D012117:Resins, Synthetic / Q000008:administration & dosage / Q000032:analysis* / Q000737:chemistry / Q000627:therapeutic use; D014018:Tissue Distribution; D014070:Tooth / Q000737:chemistry*
chemical_list: D012117:Resins, Synthetic
keywords: Colour difference; Quantitative light-induced fluorescence-digital; Resin infiltration