Department of Restorative Dentistry, Faculty of Dentistry, King Abdulaziz University, P.O. Box 80209, Jeddah 215-89, Saudi Arabia.
Cariology and Operative Dentistry Department, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan.
Biomed Res Int. 2021 Jun 8;2021:5578539. doi: 10.1155/2021/5578539. eCollection 2021.
The aim of this study was to monitor the behavior of interfacial gaps formed under different bonded polymeric restorations before and after thermocycling (TC), using swept-source optical coherence tomography (SS-OCT) and confirming the obtained findings with confocal laser scanning microscopy (CLSM).
Cylindrical class I cavities were prepared in twenty noncarious human premolar teeth (1.5 mm depth × 3.5 mm diameter) and divided randomly into two groups: TS and SN, according to the adhesive system ( = 10). In the TS group, one-step self-etch adhesive Clearfil Tri-S Bond Plus (Kuraray Noritake Dental, Japan) was used, followed by composite restoration using Estelite Sigma Quick (Tokuyama Dental, Japan). In the SN group, the cavities were restored with the two-step self-etch/composite silorane-based resin restoration system (3M ESPE, USA). All specimens were restored in bulk filling technique and cured in accordance with the manufacturers' instructions. Both groups were imaged under SS-OCT after 24 h and recorded as controls. Then, each group was subjected to thermal challenge using the TC machine (5-55°C) and B-scans were recorded at different TC intervals (2600, 5200, and 10000). In order to confirm the SS-OCT findings, additional specimens were prepared, scanned, and sectioned for CLSM observation.
B-scans demonstrated white clusters at the tooth-resin interface that corresponded to the gap location on CLSM images. The TS group showed significantly less gap formation than the SN group before and after TC ( < 0.001).
An optimal composite adaptation can be achieved when the bonded restoration comprises a combination of an adhesive containing 10-MDP monomer and a considerable highly filled composite.
本研究旨在使用扫频源光学相干断层扫描（SS-OCT）监测不同黏接聚合修复体下形成的界面间隙在热循环（TC）前后的行为，并通过共聚焦激光扫描显微镜（CLSM）确认所得结果。
在 20 个人类非龋前磨牙（1.5mm 深×3.5mm 直径）上制备圆柱形 I 类洞，并根据黏接系统随机分为两组：TS 组和 SN 组（每组 10 个）。在 TS 组中，使用一步自酸蚀黏接剂 Clearfil Tri-S Bond Plus（Kuraray Noritake Dental，日本），然后用 Estelite Sigma Quick（Tokuyama Dental，日本）进行复合修复。在 SN 组中，使用两步自酸蚀/复合硅烷树脂基修复系统（3M ESPE，美国）进行修复。所有标本均采用整体填充技术进行修复，并按照制造商的说明进行固化。两组均在 24 小时后用 SS-OCT 成像，并作为对照记录。然后，将每组标本用 TC 机进行热挑战（5-55°C），并在不同的 TC 间隔（2600、5200 和 10000）时记录 B 扫描。为了确认 SS-OCT 结果，还制备了额外的标本，进行了扫描和切片，用于 CLSM 观察。
B 扫描显示在牙齿-树脂界面处出现白色簇，与 CLSM 图像上的间隙位置相对应。在 TC 前后，TS 组的间隙形成明显少于 SN 组（<0.001）。
当黏接修复体包含含有 10-MDP 单体的黏接剂和相当高填充复合树脂的组合时，可以实现最佳的复合适应性。
