title: Characterization of transparent dentin in attrited teeth using optical coherence tomography.
abstract: Attrition and wear of tooth surface occur with aging and result in loss of enamel, with exposure and histological changes in dentin. Dealing with attrited teeth and restoration of the lost tissue are clinically challenging. The main objective of this study is to characterize the exposed transparent dentin in the occlusal surface of attrited teeth by optical coherence tomography (OCT). Naturally attrited, extracted human teeth with occlusal-transparent dentin were investigated in comparison to sound and carious teeth. The teeth were subjected to OCT imaging and then cross-sectioned and polished. OCT B-scans were compared to light microscopy images of the same cross section. In OCT images, some changes were evident at the transparent dentin in attrited teeth. An OCT attenuation coefficient parameter (μ t) was derived based on the Beer-Lambert law as a function of backscatter signal slope. The mean values of μ t were 1.05 ± 0.3, 2.23 ± 0.4, and 0.61 ± 0.27 mm(-1) for sound, carious, and transparent dentins, respectively. One-way ANOVA with Tukey's post-hoc showed a significant difference between groups (p < 0.05). Physiological changes in transparent dentin that involve deposition of mineral casts in the dentinal tubules lead to lower attenuation of OCT signal. OCT has a potential role to detect transparent dentin on the surface of attrited teeth and can be used in the future as a clinical adjunct tool.
authors: Department of Oral Health Sciences and Global Center of Excellence (GCOE) Program, Cariology and Operative Dentistry, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo, 113-8549, Japan.
authors: Mona M
authors: MM
authors: Mandurah
authors: Alireza
authors: A
authors: Sadr
authors: Turki A
authors: TA
authors: Bakhsh
authors: Yasushi
authors: Y
authors: Shimada
authors: Yasunori
authors: Y
authors: Sumi
authors: Junji
authors: J
authors: Tagami
mesh_terms: D003731:Dental Caries / Q000175:diagnosis*; D003743:Dental Enamel / Q000473:pathology; D003804:Dentin / Q000473:pathology*; D006801:Humans; D041623:Tomography, Optical Coherence; D014070:Tooth / Q000473:pathology