Mazzitelli Claudia, Monticelli Francesca, Toledano Manuel, Ferrari Marco, Osorio Raquel
Department of Fixed Prosthodontics and Dental Materials, University of Siena, Policlinico Le Scotte, viale Bracci, Siena, Italy.
Eur J Oral Sci. 2010 Feb;118(1):80-6. doi: 10.1111/j.1600-0722.2009.00703.x.
The effects of dentin surface treatments on the microtensile bond strengths and on the interfacial characteristics of self-adhesive resin cements were investigated. Flat dentin surfaces were obtained from human molars and were treated as follows: (i) no treatment of dentin; (ii) 0.1 M EDTA scrubbed for 60 s; or (iii) 10% polyacrylic acid applied for 30 s. Three self-adhesive cements were used to lute composite overlays on deep-coronal dentin surfaces in the presence of simulated pulpal pressure (15 cm of H(2)O). Bonded specimens were cut into beams 1 mm thick and stressed in tension until failure. Fractured sticks were examined under a scanning electron microscope. Additional specimens were stained with Masson's trichrome and observed under light microscopy for interfacial evaluations. The bond strength to dentin of the hydrophobic and solvent-free cement (RelyX Unicem) was unaffected by the tested dentin treatments. The bond strength of the 2-hydroxyethyl methacrylate (HEMA)-based cement (Bis-Cem) decreased after treatment of dentin with EDTA and/or polyacrylic acid. The hydrophilic and water-containing cement (G-Cem) attained a higher bond strength when luted on polyacrylic acid-conditioned dentin. In conclusion, smear layer removal, opening of dentinal tubules, and the water content of dentin differently influence the bond strengths and the interfacial characteristics of self-adhesive cement-dentin interfaces.
研究了牙本质表面处理对自粘树脂水门汀微拉伸粘结强度及界面特性的影响。从人类磨牙获取平坦的牙本质表面，并进行如下处理：（i）未对牙本质进行处理；（ii）用0.1M乙二胺四乙酸（EDTA）擦洗60秒；或（iii）涂抹10%聚丙烯酸30秒。在模拟牙髓压力（15厘米水柱）下，使用三种自粘水门汀将复合树脂修复体粘结于深龋洞牙本质表面。将粘结后的标本切成1毫米厚的梁，进行拉伸直至破坏。在扫描电子显微镜下检查断裂的试件。另外的标本用马松三色染色，在光学显微镜下观察以进行界面评估。疏水性无溶剂水门汀（RelyX Unicem）与牙本质的粘结强度不受所测试的牙本质处理的影响。基于甲基丙烯酸羟乙酯（HEMA）的水门汀（Bis-Cem）在用EDTA和/或聚丙烯酸处理牙本质后粘结强度降低。亲水性含水水门汀（G-Cem）在粘结于经聚丙烯酸处理的牙本质时获得更高的粘结强度。总之，玷污层去除、牙本质小管开放以及牙本质的含水量对自粘水门汀-牙本质界面的粘结强度和界面特性有不同的影响。
