Leonard J E, Gutmann J L, Guo I Y
Department of Restorative Sciences, Baylor College of Dentistry, Dallas, Texas 75246, USA.
Int Endod J. 1996 Mar;29(2):76-83. doi: 10.1111/j.1365-2591.1996.tb01165.x.
The efficacy of sealing root canal systems with a dentine bonding agent and resin cement was compared with that of a glass ionomer sealer. Scanning electron microscopic examination of the bonding agent-dentine interface was also performed. The root canals of 50 single rooted teeth with mature apices were prepared chemomechanically and the smear layer removed with 17% REDTA and 5.25% NaOCl. Specimens were divided into two groups of 24 teeth each. One group had the dentine conditioned with a 10:3 citric acid-ferric chloride solution and obturated with the dentine bonding agent and resin, radiopaque C & B Metabond. The other group was obturated with the glass ionomer sealer, Ketac-Endo and a single cone of gutta-percha. After immersion in Indian ink for 90 h, the teeth were cleared and the quality of the apical and coronal seal was assessed using India ink dye penetration. There was a significantly better seal in both the apical and coronal directions when using the dentine bonding agent and resin obturation material. Scanning electron microscopic examination of the demineralized dentine and the C & B Metabond interface revealed the presence of the characteristic hybrid layer along with microtags of resin penetrating deep into the dentine tubules.
将使用牙本质粘结剂和树脂水门汀封闭根管系统的效果与玻璃离子封闭剂的效果进行了比较。还对粘结剂与牙本质界面进行了扫描电子显微镜检查。对50颗根尖成熟的单根牙进行化学机械预备根管，并用17%的乙二胺四乙酸（REDTA）和5.25%的次氯酸钠（NaOCl）去除玷污层。标本被分为两组，每组24颗牙。一组用10:3的柠檬酸 - 氯化铁溶液处理牙本质，并用牙本质粘结剂和不透射线的树脂C&B Metabond进行充填。另一组用玻璃离子封闭剂Ketac-Endo和一根牙胶尖进行充填。在印度墨水中浸泡90小时后，将牙齿清理干净，并使用印度墨水染料渗透法评估根尖和冠部封闭的质量。使用牙本质粘结剂和树脂充填材料时在根尖和冠部方向的封闭效果均明显更好。对脱矿牙本质与C&B Metabond界面的扫描电子显微镜检查显示存在特征性的混合层以及深入牙本质小管的树脂微标签。
