PubMed · 789381
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D S Shovelton. 1976. Pulp protection.. https://doi.org/10.1111/j.1365-2591.1976.tb01240.x
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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.
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The protective effect of a newly designed light-cured varnish on the vulnerability to water of two kinds of glass polyalkenoate cement restorations was examined by determining the penetration depth of Ag ion into the set cement on the SEM pictures in comparison with those of the conventional varnish and a light-cured resin bonding agent. The protective effect of the experimental light-cured varnish was perfect, while those of the conventional varnish and the light-cured resin bonding agent were inferior to that.