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Journal of Biomedical Optics • Open Access

Nondestructive assessment of current one-step self-etch dental adhesives using optical coherence tomography
Author(s): Baba Bista; Alireza Sadr; Amir Nazari; Yasushi Shimada; Yasunori Sumi; Junji Tagami

Paper Abstract

This study aimed to nondestructively evaluate sealing performance of eight one-step self-etch adhesives (1-SEAs) using optical coherence tomography (OCT). The two-step self-etch adhesive (2-SEA) served as the control. Round tapered class-I cavities (D=4  mm , H=2  mm ) were prepared in bovine incisors, treated with each adhesive (n=5 ), and restored with a flowable resin composite. Cross-sections were obtained from each restoration using swept-source OCT with 1310-nm laser. The average percentage of the sealed interface (SI%) for each adhesive was calculated using image analysis software, considering increased signal intensity at the interface as gap. Samples were then sectioned and observed under confocal laser scanning microscope (CLSM). Significantly different SI% values were found among different adhesives (analysis of variance, Bonferroni, p<0.05 ). There was also a significant correlation in SI% between OCT and CLSM (p<0.0001 , r=0.96 ). Additionally, microscopic analysis revealed that the gaps in 1-SEAs occurred not only at dentine–adhesive interfaces but also frequently at adhesive–composite interfaces. Some recent 1-SEAs could achieve reliable short-term sealing comparable to 2-SEA. OCT is a unique tool to nondestructively evaluate the sealing performance of the restoratives through the cavity, provided that cavity walls have a certain minimum inclination with respect to the beam.

Paper Details

Date Published: 25 July 2013
PDF: 10 pages
J. Biomed. Opt. 18(7) 076020 doi: 10.1117/1.JBO.18.7.076020
Published in: Journal of Biomedical Optics Volume 18, Issue 7
Show Author Affiliations
Baba Bista, Tokyo Medical and Dental Univ. (Japan)
Alireza Sadr, Tokyo Medical and Dental Univ. (Japan)
Amir Nazari, Tokyo Medical and Dental Univ. (Japan)
Yasushi Shimada, Tokyo Medical and Dental Univ. (Japan)
Yasunori Sumi, National Ctr. for Geriatrics and Gerontology (Japan)
Junji Tagami, Tokyo Medical and Dental Univ. (Japan)

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