Optical coherence tomography for evaluation of enamel and protective coatings

Ehab Z. Alsayed, Ilnaz Hariri, Alireza Sadr, Syozi Nakashima, Turki A. Bakhsh, Yasushi Shimada, Yasunori Sumi, Junji Tagami

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)98-107
Number of pages10
JournalDental materials journal
Issue number1
Publication statusPublished - 2015
Externally publishedYes


  • Demineralization
  • Enamel
  • Optical coherence tomography
  • Resin coating

ASJC Scopus subject areas

  • Ceramics and Composites
  • Dentistry(all)


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