Saunders W P, Saunders E M, Herd D, Stephens E
Department of Conservative Dentistry, Glasgow Dental Hospital and School, UK.
Int Endod J. 1992 Sep;25(5):238-44. doi: 10.1111/j.1365-2591.1992.tb01156.x.
The use of a resin-based glass ionomer as an endodontic sealer was studied in vitro. The root canals of extracted single-rooted human teeth with mature apices were prepared using a stepback technique. Subsequently, the smear layer was removed with 40% citric acid and the canals obturated using lateral condensation of cold gutta-percha and a resin-based glass ionomer as the sealer. The relationship between the sealer and the wall of the root canal was studied using scanning electron microscopy. The shear bond strength of gutta-percha to this glass ionomer was also determined. Finally, the uptake of fluoride into the wall of the root canal was studied using scanning electron microprobe analysis after storage for 2 weeks, 1 month and 3 months following root filling with gutta-percha and glass ionomer cement. The results showed that removal of the smear layer allowed the sealer to enter some of the dentinal tubules. This was observed most frequently in the middle third of the root canal, where there was good adaptation of the sealer. The shear bond strength of gutta-percha to the glass ionomer sealer was not significantly different from that obtained between gutta-percha and a proprietary zinc oxide-eugenol endodontic sealer. The concentration of fluoride in the dentine in the coronal part of the root canal increased after obturation with gutta-percha and the glass ionomer sealer at every time interval. The increase in fluoride concentration varied widely between teeth. It is concluded that a resin-based glass ionomer cement may have potential as a root canal sealer.
在体外研究了基于树脂的玻璃离子水门汀作为根管封闭剂的应用。采用逐步后退技术对根尖成熟的单根人离体牙的根管进行预备。随后，用40%的柠檬酸去除玷污层，并用冷牙胶侧向加压充填根管，同时使用基于树脂的玻璃离子水门汀作为封闭剂。利用扫描电子显微镜研究封闭剂与根管壁之间的关系。还测定了牙胶与这种玻璃离子水门汀的剪切粘结强度。最后，在使用牙胶和玻璃离子水门汀进行根管充填后，分别在2周、1个月和3个月时进行储存，然后利用扫描电子微探针分析研究根管壁对氟的摄取情况。结果显示，去除玷污层后封闭剂能够进入一些牙本质小管。这在根管中1/3处最为常见，此处封闭剂与根管壁贴合良好。牙胶与玻璃离子水门汀封闭剂的剪切粘结强度与牙胶和一种专利氧化锌丁香酚根管封闭剂之间的粘结强度相比，无显著差异。在每个时间间隔，使用牙胶和玻璃离子水门汀封闭剂充填后，根管冠部牙本质中的氟浓度均升高。不同牙齿之间氟浓度的升高差异很大。得出的结论是，基于树脂的玻璃离子水门汀可能具有作为根管封闭剂的潜力。
