AlRefeai Mohammad H, AlHamdan Eman M, Al-Saleh Samar, Farooq Imran, Abrar Eisha, Vohra Fahim, Abduljabbar Tariq
Department of Restorative Dentistry-Operative Division, College of Dentistry, King Saud University, P.O. Box 21069, Riyadh 11475, Saudi Arabia.
Department of Prosthetic Dental Sciences, College of Dentistry, King Saud University, P.O. Box 21069, Riyadh 11475, Saudi Arabia.
Polymers (Basel). 2021 Jul 23;13(15):2418. doi: 10.3390/polym13152418.
Our study aimed to synthesize and compare the mechanical properties and dentin interaction of two adhesives; experimental adhesive (EA) and EA containing 5 wt.% calcium fluoride (CaF) nano-crystals (CaF adhesive-CAFA). CaF nano-crystals were synthesized by reacting two solutions (containing calcium and fluoride) in a glass chamber using a heated air system. The EA was produced using a mix of monomers, photo-initiators, camphorquinone, and electron initiators. The synthesized CaF nano-crystals were centrifuged to guarantee that inside the adhesive there is homogenized dispersion of the filler particles. Their integration in the EA yielded two groups; Gp-1: EA (without CaF, control) and Gp-2: (5 wt.% CaF containing adhesive, CAFA). Sixty teeth were prepared and set to form bonded specimens using the two adhesives. The CaF nano-crystals were irregularly shaped with an average particle size of 30-200 nm. The highest μTBS values were obtained for CAFA-non-thermocycled (NTC) samples (32.63 ± 3.15), followed by EA-NTC (31.80 ± 3.75) specimens. On thermocycling (TC), both adhesive groups presented lower μTBS values (CAFA-TC: 29.47 ± 3.33 and EA-TC: 24.04 ± 3.69). Hybrid layer (HL) formation and resin tags of varying depths were perceived for both adhesive groups. The EDX analysis demonstrated the presence of carbon (C), silica (Si), calcium (Ca), and fluoride (F) for CAFA group. Micro-Raman spectroscopy revealed distinct peaks for CaF nano-crystals. The CAFA group presented the greatest DC. The addition of CaF nano-crystals in the adhesive caused improved bond μTBS and DC. The incorporation also demonstrated suitable dentin interaction, depicted by appropriate HL and resin tag development.
我们的研究旨在合成并比较两种粘合剂的机械性能和与牙本质的相互作用；实验性粘合剂（EA）和含有5 wt.% 氟化钙（CaF）纳米晶体的EA（CaF粘合剂-CAFA）。通过在玻璃腔室中使用加热空气系统使两种溶液（含钙和氟）反应来合成CaF纳米晶体。EA是使用单体、光引发剂、樟脑醌和电子引发剂的混合物制备的。将合成的CaF纳米晶体离心，以确保粘合剂内部填料颗粒均匀分散。它们在EA中的整合产生了两组；Gp-1：EA（不含CaF，对照组）和Gp-2：（含5 wt.% CaF的粘合剂，CAFA）。制备了60颗牙齿，并使用这两种粘合剂制成粘结标本。CaF纳米晶体形状不规则，平均粒径为30-200 nm。CAFA-非热循环（NTC）样品获得了最高的微拉伸粘结强度（μTBS）值（32.63±3.15），其次是EA-NTC（31.80±3.75）标本。在热循环（TC）时，两个粘合剂组的μTBS值均较低（CAFA-TC：29.47±3.33和EA-TC：24.04±3.69）。两个粘合剂组均观察到混合层（HL）形成和不同深度的树脂突。能量色散X射线光谱（EDX）分析表明CAFA组存在碳（C）、硅（Si）、钙（Ca）和氟（F）。显微拉曼光谱显示了CaF纳米晶体的明显峰。CAFA组表现出最大的脱矿深度（DC）。在粘合剂中添加CaF纳米晶体可提高粘结μTBS和DC。这种掺入还表现出合适的与牙本质的相互作用，表现为适当的HL和树脂突形成。
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