Touch-Cure Polymerization at the Composite Cement-Dentin Interface
Touch-Cure Polymerization at the Composite Cement-Dentin Interface
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DOI：
10.1177/00220345211001020
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发表时间：
2021-08-01
影响因子：
7.6
通讯作者：
Van Meerbeek, B.
中科院分区：
文献类型：
--
作者：
Yoshihara, K.;Nagaoka, N.;Van Meerbeek, B.
陶瓷修复体通常粘附在牙齿预备物上。所谓的触摸固化概念是为了在修复体-水泥-牙齿界面产生最佳的复合水泥聚合，以立即稳定粘合。虽然理论上认为，当底漆中的促进剂与水泥接触时，这种接触固化会在界面上引发聚合，但这一过程尚未得到证实。本研究旨在通过使用实时傅里叶变换红外光谱（RT-FTIR）和衰减全反射(ATR)-FTIR，通过测量复合水泥使用或不使用含加速剂的牙齿底漆（TP）与不使用加速剂的底漆的转化程度（DC）来阐明触摸固化的机制。采用剪切模式测量界面结合强度，x射线荧光分析（XRF）确定加速剂成分，并通过x射线衍射（XRD）、三维界面重建的聚焦离子束扫描电镜（FIB-SEM）和透射电镜（TEM）研究TP和复合水泥与牙本质的界面相互作用。RT/ATR-FTIR显示，当复合水泥使用含有促进剂的底漆时，DC显著最高。XRF公布了一种钒化合物作为TP内的新型化学促进剂，取代了传统的化学固化引发剂体系，可以在水泥与之前应用的底漆接触时引发接触固化。虽然TP含有酸性功能单体10-MDP用于与牙齿组织的粘附，但使用含有促进剂的TP可以将最快/最高的DC与最高的粘合强度结合起来。FIB-SEM和TEM证实了牙本质与亚微米杂交紧密的界面相互作用以及稳定的10-MDP和钙盐纳米层。
Ceramic restorations are often adhesively luted onto the tooth prep. The so-called touch-cure concept was developed to yield optimum polymerization of composite cement at the restoration-cement-tooth interface for immediate bond stabilization. Although this touch cure is theorized to initiate polymerization at the interface when the accelerator in the primer makes contact with the cement, this process has not yet been proven. This study aimed to elucidate the mechanism of touch cure by measuring the degree of conversion (DC) of composite cement applied with or without an accelerator-containing tooth primer (TP) versus an accelerator-free primer using real-time Fourier-transform infrared spectroscopy (RT-FTIR) and attenuated total reflection (ATR)-FTIR. Interfacial bond strength was measured in shear mode, the accelerator composition confirmed by X-ray fluorescence analysis (XRF), and the interfacial interaction of TP and composite cement with dentin investigated by X-ray diffraction (XRD), focused-ion-beam scanning electron microscopy (FIB-SEM) with 3-dimensional interface reconstruction, and transmission electron microscopy (TEM). RT/ATR-FTIR revealed the significantly highest DC when the composite cement was applied with the accelerator-containing primer. XRF disclosed a vanadium compound as a novel chemical accelerator within TP, instead of a classic chemical curing initiator system, to set off touch cure as soon the cement contacts the previously applied primer. Although the TP contains the acidic functional monomer 10-MDP for adhesion to tooth tissue, touch cure using the accelerator-containing TP combined the fastest/highest DC with the highest bond strength. FIB-SEM and TEM confirmed the tight interfacial interaction at dentin with submicron hybridization along with stable 10-MDP also Ca-salt nanolayering.