MacPherson M G, Hartwell G R, Bondra D L, Weller R N
J Endod. 1989 May;15(5):212-5. doi: 10.1016/S0099-2399(89)80238-9.
An in vitro dye leakage study was performed to compare the sealing ability of high-temperature thermoplasticized gutta-percha, high copper amalgam, and warm gutta-percha when used as retrofilling materials. Forty-five extracted anterior teeth were obturated with gutta-percha, the apical 3 mm of the roots were resected, and 2-mm-deep retrograde preparations were prepared. The roots were then randomly placed into three groups and retrofilled with one of the experimental materials. After 72 h in India ink, the teeth were cleared and evaluated for leakage using a stereomicroscope. No leakage was evident in the three teeth used as negative controls. Complete leakage was noted in the three positive control teeth. Statistical analysis of the results showed that high-temperature thermoplasticized gutta-percha had significantly less leakage than did high copper amalgam.
进行了一项体外染料渗漏研究，以比较高温热塑牙胶、高铜汞合金和热牙胶用作倒充填材料时的封闭能力。45颗拔除的前牙用牙胶充填，切除牙根根尖3mm，并制备2mm深的倒预备洞形。然后将牙根随机分为三组，用一种实验材料进行倒充填。在印度墨水中浸泡72小时后，将牙齿清理干净，并用体视显微镜评估渗漏情况。用作阴性对照的三颗牙齿未发现渗漏。三颗阳性对照牙出现完全渗漏。结果的统计分析表明，高温热塑牙胶的渗漏明显少于高铜汞合金。
