Guerra J A, Skribner J E, Lin L M
Department of Endodontics, University of Medicine and Dentistry of New Jersey, Newark 07103, USA.
J Endod. 1994 Dec;20(12):589-91. doi: 10.1016/S0099-2399(06)80082-8.
This study compared the coronal microleakage of post-prepared teeth with and without the placement of a zinc oxide-eugenol cement seal coronal to the gutta-percha. Forty single-rooted extracted teeth were prepared and obturated with sealer and gutta-percha. These teeth were divided into two groups of teeth 20 each. A post space was prepared for each tooth so that 5 to 6 mm of gutta-percha remained in one group and 3 to 4 mm in the other group. To the latter group, 2 to 3 mm of zinc oxide-eugenol cement base was placed directly coronal to the gutta-percha. The sealer was allowed to set for 48 h and the outer root surfaces of the teeth were covered with finger nail varnish and sticky wax, except for the access openings. The teeth were immersed in dye for 1 wk to allow coronal microleakage. The specimens were sectioned and measurements were made on the extent of dye penetration into the root filling. The teeth without a zinc oxide-eugenol base showed significantly greater microleakage than those protected with a zinc oxide-eugenol base.
本研究比较了根管预备后放置与未放置氧化锌丁香酚水门汀封闭牙胶冠方的牙齿的冠部微渗漏情况。选取40颗单根离体牙进行预备，并用封闭剂和牙胶进行充填。将这些牙齿分为两组，每组20颗。为每颗牙齿制备桩道，使一组保留5至6毫米的牙胶，另一组保留3至4毫米的牙胶。对于后一组，在牙胶冠方直接放置2至3毫米厚的氧化锌丁香酚水门汀基底。封闭剂凝固48小时后，除了入口处，用指甲油和粘性蜡覆盖牙齿的外根表面。将牙齿浸泡在染料中1周以评估冠部微渗漏情况。将标本切片并测量染料渗入根管充填物的程度。未使用氧化锌丁香酚基底的牙齿显示出比使用氧化锌丁香酚基底保护的牙齿明显更大的微渗漏。
