Optical coherence tomography for evaluation of enamel and protective coatings

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.

Effects of experimental pastes containing surface pre-reacted glass ionomer fillers on inhibition of enamel demineralization

“…This fact suggests that the effect of inhibition of demineralization of the S-PRG filler containing experimental pastes was not only due to F ions, but also related to other ions released from the S-PRG fillers 32) . A recent study on a S-PRG containing coating material also suggested that multiple ions release from these fillers increased the resistance of enamel against demineralization 33) . It was shown that ions released from the S-PRG filler had antibacterial and pH neutralizing effects on acidic solutions [34][35][36] .…”

Comparison of resin-based and glass ionomer sealants with regard to fluoride-release and anti-demineralization efficacy on adjacent unsealed enamel

“…The axial and lateral optical resolutions in air were 12 and 20 µm, respectively. The details of this system have been described elsewhere 16,17) . The specimens were washed with deionized water under controlled hydrated conditions at each scanning time-point.…”

“…Optical coherence tomography (OCT) is a newly developed, non-invasive, cross-sectional, real-time Comparison of resin-based and glass ionomer sealants with regard to fluoriderelease and anti-demineralization efficacy on adjacent unsealed enamel imaging tool that has been widely used for the nondestructive assessment of enamel and dentine demineralization, as well as the interfacial adaptation of sealant and restorative materials 16,17) . Quantitative measurement of light propagation in tissues, measured as the attenuation coefficient (µ t) parameter in OCT, has shown promising results with regard to its ability to discriminate between sound and demineralized tooth structures [18][19][20] .…”

A Deep Morphological Characterization and Comparison of Different Dental Restorative Materials

“…It has been introduced as the true hybridization of glass ionomer (GI) and composite resin and has the distinguishing feature of a stable surface prereacted glass ionomer (S-PRG), which is coated with an ionomer lining incorporated in a resin matrix. This arrangement aids in the protection of the glass core from moisture, adding to long-standing aesthetics, durability, physical and handling properties of composite resins with fluoride release, and recharge property like the GI cement [1–5]. …”