Sadek F T, Pashley D H, Ferrari M, Tay F R
Department of Dental Materials, School of Dentistry, University of São Paulo, Brazil.
J Dent Res. 2007 Jun;86(6):524-8. doi: 10.1177/154405910708600607.
Although hydrophobic resins may be bonded to acid-etched dentin with an ethanol wet-bonding technique, the protocol is sensitive to moisture contamination when bonding is performed in deep dentin. This study tested the hypothesis that the use of oxalate or poly(glutamic) acid-modified, diluted ceramicrete (PADC) for dentinal tubule occlusion prevents fluid contamination and improves the bonding of an experimental hydrophobic adhesive to acid-etched, ethanol-dehydrated dentin. Mid-coronal and deep acid-etched moist dentin pre-treated with oxalate or PADC was dehydrated by ethanol wet-bonding and infiltrated with the experimental three-step etch-and-rinse hydrophobic adhesive under simulated pulpal pressure. Tensile bond strengths to deep dentin without pre-treatment were severely compromised. Conversely, oxalate and PADC pre-treatments reduced dentin permeability, prevented water contamination, and improved bond strengths. Minimal nanoleakage was identified within hybrid layers created in the oxalate- and PADC-pre-treated deep dentin. The use of tubular occluding agents optimized bonding of hydrophobic resins to dentin.
尽管疏水性树脂可以通过乙醇湿粘接技术与酸蚀牙本质粘接，但在深牙本质中进行粘接时，该方案对水分污染敏感。本研究检验了以下假设：使用草酸盐或聚（谷氨酸）酸改性的稀释陶瓷粘结剂（PADC）封闭牙本质小管可防止液体污染，并改善实验性疏水性粘合剂与酸蚀、乙醇脱水牙本质的粘接。用草酸盐或PADC预处理的中冠部和深部酸蚀湿润牙本质通过乙醇湿粘接脱水，并在模拟牙髓压力下用实验性三步蚀刻冲洗疏水性粘合剂渗透。未经预处理的深牙本质的拉伸粘结强度严重受损。相反，草酸盐和PADC预处理降低了牙本质渗透性，防止了水污染，并提高了粘结强度。在草酸盐和PADC预处理的深牙本质中形成的混合层内发现了最小的纳米渗漏。使用小管封闭剂可优化疏水性树脂与牙本质的粘接。
