title: Influence of a base on coronal microleakage of post-prepared teeth.
abstract: 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.
authors.affiliation: Department of Endodontics, University of Medicine and Dentistry of New Jersey, Newark 07103, USA.
authors.forename: J A
authors.initials: JA
authors.lastname: Guerra
authors.forename: J E
authors.initials: JE
authors.lastname: Skribner
authors.forename: L M
authors.initials: LM
authors.lastname: Lin
mesh_terms: D003736:Dental Cavity Lining; D003763:Dental Leakage / Q000517:prevention & control*; D006801:Humans; D011176:Post and Core Technique; D012387:Root Canal Filling Materials; D012389:Root Canal Obturation / Q000379:methods; D015035:Zinc Oxide-Eugenol Cement
chemical_list: D012387:Root Canal Filling Materials; D015035:Zinc Oxide-Eugenol Cement