牙本质粘接剂的相分离现象

An overview of phase separation phenomenon in dentine adhesive

随着对树脂粘接剂研究的逐步深入,相分离现象成为了近年的研究热点。现代粘接技术提出"湿粘接"以形成高质量混合层。牙本质表面干燥会导致胶原纤维网的皱缩,纤维内肽间会建立氢键结合从而减少脱矿区对树脂单体的渗透性,降低粘接效果。然而最近发现,"湿粘接"会使牙本质残存水量过高导致粘接剂发生树脂基质相分离现象,使树脂出现固化不全,同样导致粘接强度和粘接耐久性降低。因此,减少相分离对树脂的不良影响对于提高牙本质粘接效果有重要意义。本文就牙本质-树脂粘接界面相分离现象的研究进展作一综述。

Due to the unremitting study of the dentine adhesive,the phase separation phenomenon during bonding process becomes a hot issue in recent years. It is known that Dehydration on dentin due to establishment of hydrogen bond in peptide of collagen fiber. It doesn＇t benefit for the formation of hybrid layer and resin tags. On the contrary,water-rich condition in dentin may cause the phase separation between hydrophilic and hydrophobic monomers. It will reduce the bonding strength and the bonding durability between the dentin and composite resin ultimately. Thus,reducing phase separation of adhesives in the presence of water and keeping homogenous pene-tration of adhesives into wet demineralized dentin are very critical factors during the dentin bonding process. Therefore,the research of phase separation phenomenon in dentine adhesive will be report in this review.