Li Xiao, Zhao Xin-yi, Shi Chang-xi, Zhu Guang-di, Li Hong-tao
Department of Stomatology, Guangzhou General Hospital, Guangzhou Military Command, Guangzhou 510010, China.
Shanghai Kou Qiang Yi Xue. 2004 Feb;13(1):44-7.
To study the influences on microstructure characteristic and bonding strength of acetone-based wet bonding systems when bonding on dry or wet dentin surface.
Three acetone-based wet bonding systems, Gluma One-Bond, Bond-1 and One-Step, were used to bond Chrisma composite resin to dry or moist dentin surface, and the bonding interface was observed with HITACHI S-2700 scanning electron microscope. Microtensile strengths of different groups were measured with Instro 1195.
All three bonding systems can infiltrate well into dentin bonding interface in the wet groups. A hybrid layer of about 5microm could be observed with resin tags traversing from the resin layer above into the undemineralized dentin below and the lateral branch of dentinal tubule. In the dry groups, three zones, a surface and a basal hybrid layer sandwiching a middle hybridoid region, could be observed. The hybrid layer was very thinner. Microtensile strength had significantly decreased while bonding on dry dentin surface with acetone-based wet bonding systems, with the maximum decrease of 39% in Bond-1.
Incompletely infiltrated adhesive on dentin bonding interface could be observed and microtensile strength had significantly decreased while bonding on dry dentin surface with acetone-based wet bonding systems. Moist dentin surface, which can maintain collagen-rich fibrous network of demineralized dentin, is necessary when bonding with acetone-based wet bonding systems. Microtensile strength approaches to the real dentin bonding strength.
研究丙酮基湿粘接系统在干燥或湿润牙本质表面粘接时对微观结构特征及粘接强度的影响。
使用三种丙酮基湿粘接系统，即Gluma One-Bond、Bond-1和One-Step，将Chrisma复合树脂粘接于干燥或湿润的牙本质表面，采用日立S-2700扫描电子显微镜观察粘接界面。用Instron 1195测量不同组别的微拉伸强度。
在湿润组中，所有三种粘接系统均可良好地渗入牙本质粘接界面。可观察到约5微米的混合层，树脂突从上方的树脂层穿过进入下方未脱矿的牙本质及牙本质小管的侧支。在干燥组中，可观察到三个区域，即一个表面混合层和一个基底混合层夹着一个中间类混合区域。混合层非常薄。当用丙酮基湿粘接系统在干燥牙本质表面粘接时，微拉伸强度显著降低，其中Bond-1降低最多达39%。
用丙酮基湿粘接系统在干燥牙本质表面粘接时，可观察到牙本质粘接界面处粘接剂浸润不完全，且微拉伸强度显著降低。湿润的牙本质表面对于保持脱矿牙本质富含胶原的纤维网络是必要的，在用丙酮基湿粘接系统粘接时，微拉伸强度接近实际的牙本质粘接强度。
