title: The effect of dentine on fluorescence measurements of enamel lesions in vitro.
abstract: This study aimed to determine the contribution of the underlying dentine and the enamel-dentine junction to measurements of mineral loss from enamel recorded using quantitative light fluorescence (QLF). Sixteen square blocks (5 x 5 mm) were cut from the labial surfaces of extracted bovine incisor teeth. A dental drill was used to remove dentine and the enamel-dentine junction from half of each specimen. All specimens were embedded in epoxy resin and ground to produce a smooth, flat enamel surface. Half of the enamel surface of the block, perpendicular to where the dentine had been removed, was demineralised for 72 h prior to undertaking QLF measurements from the enamel surface to compare fluorescence loss from different areas of the block. QLF readings taken from lesions with no underlying dentine or enamel-dentine junction were very similar to readings from lesions with underlying dentine. A comparison of the two data sets demonstrated a linear relationship with a gradient of 0.95 and a y intercept of -1.24 (r(2) = 0.936). From these data, the underlying dentine and enamel-dentine junction did not influence mineral loss in enamel measured using QLF.
authors.affiliation: Institute of Photonics, Strathclyde University, Glasgow, Scotland, UK.
authors.forename: C
authors.initials: C
authors.lastname: Rousseau
authors.forename: S
authors.initials: S
authors.lastname: Vaidya
authors.forename: S L
authors.initials: SL
authors.lastname: Creanor
authors.forename: A F
authors.initials: AF
authors.lastname: Hall
authors.forename: J M
authors.initials: JM
authors.lastname: Girkin
authors.forename: C J
authors.initials: CJ
authors.lastname: Whitters
authors.forename: R
authors.initials: R
authors.lastname: Strang
authors.forename: S
authors.initials: S
authors.lastname: McHugh
mesh_terms: D000818:Animals; D002417:Cattle; D003743:Dental Enamel / Q000473:pathology*; D003804:Dentin / Q000502:physiology*; D005453:Fluorescence; D012044:Regression Analysis; D017001:Tooth Demineralization / Q000175:diagnosis*