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Optical coherence tomography for evaluation of enamel and protective coatings
Ehab Z Alsayed1, Ilnaz Hariri, Alireza Sadr
1Tokyo Medical and Dental University, Cariology and Operative Dentistry Department and Global Center of Excellence (GCOE) Program, 1-5-45 Yushima, Bunkyo-ku, Japan; Yanbu Dental Center, Saudi Ministry of Health, Al-Madina Health Region, Saudi Arabia.
Abstract:
Optical coherence tomography (OCT) is an interferometric imaging technique. This study aimed to employ OCT to evaluate four different resin-based materials including a coating containing glass-ionomer filler and calcium, a giomer, and two fluoride-releasing self-etch resins. The coating and its underlying and adjacent enamel were monitored using swept-source OCT (center wavelength: 1330 nm) at baseline, after 5,000 thermal cycles, and after 1, 4 and 7 days of demineralization (pH 4.5). The coatings showed different thicknesses (60-250 micrometers) and various levels of structural and interfacial integrity. OCT could detect a demineralization inhibition zone adjacent to the edge of the fluoride- and calcium-releasing material. Localized demineralization was occasionally observed under thinner coatings. Protection of susceptible enamel surfaces by thin resin-based bioactive coatings provides protection from demineralization. OCT can be used to non-destructively monitor the integrity of such coatings, as well as enamel changes beneath and adjacent to them.
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