Dental Materials Journal
Online ISSN : 1881-1361
Print ISSN : 0287-4547
ISSN-L : 0287-4547
Original Paper
Noninvasive diagnostic method using optical coherence tomography detected a vulnerable dentin enamel junction created by phosphoric acid etching
Takaaki SATOTomoko TABATAKoudai AKABANEMengtian ZHAOAbu Hasan Mohammad KHALEDNoriko HIRAISHIYasunori SUMIJunji TAGAMIYasushi SHIMADA
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2023 Volume 42 Issue 4 Pages 552-558

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Abstract

To investigate the influence of phosphoric acid etching on the dentin enamel junction (DEJ) using optical coherence tomography (OCT). Human teeth were assigned to four groups: 1. control, no additional treatment (CT); 2. The primer of “SE Bond2” was applied (SE), 3. “Enamel Conditioner” was applied (EC), 4. “K-etchant syringe” was applied (KE). After treatment, the DEJ was observed using a laser microscope (CLSM), OCT, and scanning electron microscopy (SEM). Additionally, an ultimate tensile strength (UTS) test at the DEJ was performed. No cracks were observed by CLSM. In contrast, cracks were observed all samples by SEM. Additionally, OCT revealed a white line along the DEJ in all KE specimens and some EC specimens. The UTS test showed a significant difference between CT and KE. This study found that phosphoric acid etching may cause excessive demineralization and weaken the DEJ. This fragility was observed using a non-invasive diagnostic method using OCT.

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© 2023 The Japanese Society for Dental Materials and Devices
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