Alsayed Ehab Z, Hariri Ilnaz, Sadr Alireza, Nakashima Syozi, Bakhsh Turki A, Shimada Yasushi, Sumi Yasunori, Tagami Junji
Tokyo Medical and Dental University, Cariology and Operative Dentistry Department and Global Center of Excellence (GCOE) Program, 1-5-45 Yushima, Bunkyo-ku, Japan; Yanbu Dental Center, Saudi Ministry of Health, Al-Madina Health Region, Saudi Arabia.
Dent Mater J. 2015;34(1):98-107. doi: 10.4012/dmj.2014-215.
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.
光学相干断层扫描（OCT）是一种干涉成像技术。本研究旨在采用OCT评估四种不同的树脂基材料，包括一种含玻璃离子填料和钙的涂层、一种玻璃聚离子体以及两种含氟自酸蚀树脂。在基线、5000次热循环后以及脱矿（pH 4.5）1天、4天和7天后，使用扫频源OCT（中心波长：1330 nm）监测涂层及其下方和相邻的牙釉质。这些涂层表现出不同的厚度（60 - 250微米）以及不同程度的结构和界面完整性。OCT能够检测到与含氟和含钙材料边缘相邻的脱矿抑制区。在较薄的涂层下方偶尔会观察到局部脱矿。基于树脂的薄生物活性涂层对易感牙釉质表面的保护可防止脱矿。OCT可用于无损监测此类涂层的完整性以及其下方和相邻牙釉质的变化。
