Effects of structural orientation of enamel and dentine on light attenuation and local refractive index: An optical coherence tomography study

Assessment of occlusal fissure depth and sealant penetration using optical coherence tomography

“…The spectral bandwidth of the laser exceeds 100 nm centered at 1,319 nm at a 20 kHz sweep rate. Axial resolution of this system in air is 11 µm, which corresponds to 7 µm within dental tissue having a refractive index of about 1.5 21) . The lateral resolution of this system is 17 µm, which is determined by the objective lens and beam diameter inside the probe.…”

Measurement of the remaining dentin thickness using optical coherence tomography for crown preparation

“…In 2000, it was suggested that these were cautious estimates and that excessive tooth preparations, carefully cut down to 0.50 mm, appeared to have only a limited effect on the underlying odontoblast survival 2,5,7) . It was reported that specimens that had dentin thicknesses of 0.30-0.40 mm could yield Z 2 OCT images 18) . In this study, all specimens that had dentin thicknesses of 1.00 mm or less could yield Z2 or Z2' OCT images.…”

“…It was reported that a change in scattering with respect to a change in the structural orientation of dentin results in a variable refractive index 18) . Hariri reported that the average dentin refractive index was 1.55 using a 1,330-nm center wavelength; however, a significant decrease in the refractive index was detected in locations within the dentin block, in which the dentinal tubules were parallel or were at a small angle to the direction of the light beam, compared to that of the dentin block, in which the dentinal tubules were perpendicular and oblique 18) .…”

Evaluation of the effects of fluoride-releasing varnish on dentin demineralization using optical coherence tomography

“…Therefore, TD-OCT continues to have applications where either a large scanning range or high lateral resolution is required, for example, for subsurface carious lesion imaging 19) . Because of the complex and anisotropic nature of tooth substrates, optical properties such as absorption and scattering distribution generally depend on the orientation of their components relative to the irradiating light source 20) . Dentin has a complex structure and comprises three main components: hydroxyapatite, a collagen-based organic matrix, and tubules permeating its entire mass 21) .…”