Zmener Osvaldo, Banegas Gladys, Pameijer Cornelis H
Department of Adult Dental Care, Section of Endodontics, Faculty of Odontology, University of Buenos Aires, Buenos Aires, Argentina.
J Endod. 2004 Aug;30(8):582-4. doi: 10.1097/01.don.0000121610.63000.f2.
The sealing properties of three temporary restorative materials, Cavit, IRM, and a polycarboxylate-based cement, Ultratemp Firm, were investigated in vitro. Standardized access cavities were prepared in 45, intact, extracted, human molars. The teeth were randomly assigned to three groups and the access openings filled with one of three temporary filling materials. In five teeth (negative control), no restorative material was placed but the preparations were coated entirely with sticky wax. The five teeth of the positive control group had no restorative material and no sticky wax applied. After thermocycling for 500 cycles (5-55 degrees C), the experimental teeth were dipped in molten sticky wax to the CEJ. The coronal enamel was subsequently coated with two layers of nail varnish, leaving an area of 1 mm around the filling material uncovered. The samples were then immersed in 2% methylene blue dye solution for leakage assessment. The teeth were sectioned and the greatest depth of dye penetration was recorded. Positive control sections exhibited complete dye penetration, whereas negative controls had none. There was no statistically significant difference in marginal leakage between Cavit, IRM, and Ultratemp Firm (p > 0.05). All materials leaked at the interface material-dentin, whereas some IRM specimens absorbed the dye into the bulk of the material.
在体外研究了三种临时修复材料Cavit、IRM和一种聚羧酸锌基水门汀Ultratemp Firm的封闭性能。在45颗完整的拔除人磨牙上制备标准化的髓腔入口。将牙齿随机分为三组，髓腔入口用三种临时充填材料之一充填。在五颗牙齿（阴性对照）中，未放置修复材料，但制备物全部用粘性蜡覆盖。阳性对照组的五颗牙齿既未放置修复材料也未涂抹粘性蜡。在进行500次热循环（5-55摄氏度）后，将实验牙齿浸入熔融的粘性蜡中至牙骨质牙本质界。随后在牙冠釉质上涂两层指甲油，使充填材料周围留出1毫米的未覆盖区域。然后将样本浸入2%亚甲蓝染料溶液中进行渗漏评估。将牙齿切片并记录染料渗透的最大深度。阳性对照切片显示染料完全渗透，而阴性对照则无染料渗透。Cavit、IRM和Ultratemp Firm之间的边缘渗漏在统计学上无显著差异（p>0.05）。所有材料在材料与牙本质的界面处均有渗漏，而一些IRM样本将染料吸收到材料主体中。
