Evaluation of the adaptation of dental polymers using cross-polarization optical coherence tomography

Abstract

Objective: The purpose of this study was to image gap formation and micro-leakage in restored cervical cavities with three different dental adhesives using cross-polarization optical coherence tomography (CP-OCT). Methodology: Thirty saucer shape class-V cavities were prepared on the buccal and lingual surfaces of extracted human molars. Samples were randomly divided into three groups (n=10) according to the used adhesive; all-in-one Tetric N-Bond self-etch (TN; Ivoclar/Vivadent, Liechtenstein), G-Premio universal (GP; GC, Japan) in self-etch mode and two-step self-etch Clearfil SE Bond 2 (SE; Kuraray Noritake, Japan). All cavities were bonded and filled with a universal composite (Estelite ∑ Quick, Tokuyama Dental, Japan) and cured by the LED light curing unit. Then, tomographic images were taken under CP-OCT to detect gap formation at the cavity in order to calculate the gap percentage in each group. Result: Mann-Whitney U test showed statistical significant difference among all groups (p<0.05) with high gap percentage in GP group followed by TN group. SE group showed the highest composite adaptation with the lowest gap percentage. Conclusion: Within the limitation of the study, the restored cavities with two-step self-etch adhesive exhibited fewer microgaps and micro-leakage than one-step self-etch adhesives.

An Eggshell-Based Toothpaste as a Cost-Effective Treatment of Dentin Hypersensitivity

“…CP-OCT had been therefore successfully used to investigate the changes in dental tissues. 21 23 When the light is emitted from the OCT, it will pass through the air into dentin surface. As the refractive index (RI) of air is 1, the light passes through the air without any scattering or reflection.…”

“…The obtained OCT data were analyzed using an image analysis software (ImageJ v. 1.45q, National Institutes of Health). 21 22 The obtained data were converted to eight-bit grayscale, followed by adjusting the dentin surface with horizontal plane (zero degree) followed by adjusting the scale according to the acquired OCT data (pixel size). Then, five equal areas (0.20 mm width × 0.50 mm depth) as a representative dimension of the area of interest (AOI) were selected within the outer dentin surface at different locations.…”

Optical comparison between micro‐CT and OCT in imaging of marginal composite adaptation: Observational study

“…However, the increased imaging depth will decrease its resolution, which will limit its usefulness in the dental field. Compared to conventional X‐rays, cone beam computed tomography is another nondestructive imaging technique that can provide a better resolution in two dimensions (2D) and three dimensions (3D) 14,15 . Further advances in biomedical imaging technology resulted in the introduction of optical coherence tomography (OCT) and microcomputed tomography (micro‐CT) 14–16 .…”

“…Compared to conventional X‐rays, cone beam computed tomography is another nondestructive imaging technique that can provide a better resolution in two dimensions (2D) and three dimensions (3D) 14,15 . Further advances in biomedical imaging technology resulted in the introduction of optical coherence tomography (OCT) and microcomputed tomography (micro‐CT) 14–16 . Although they can provide cross‐sectional and volumetric images of biological structures and nonmetallic biomaterials at micrometre‐resolution nondestructively, the mechanism of image acquisition is different 16 .…”