title: Class 5 composite resin restorations: margin configurations and the distance from the CEJ.
abstract: An in vitro study of 60 teeth examined the cervical microleakage of class 5 composite resin restorations in regard to preparation design and location from the cementoenamel junction (CEJ). Four groups of 15 teeth each were prepared for a class 5 composite resin restoration with the cervical margins finished as follows: a butt joint margin placed less than 1 mm from the CEJ, a beveled margin placed less than 1 mm from the CEJ, a butt joint placed greater than 1.5 mm from the CEJ, and a beveled margin placed greater than 1.5 mm from the CEJ. The teeth were acid etched, treated with an enamel bonding agent, and restored with a microfilled composite resin, and then sectioned for further analysis. The sectioned specimens were evaluated for cervical microleakage by Ca45 autoradiography. The butt joint margins placed less than 1 mm from the CEJ had significantly more microleakage than the other groups, indicating that all enamel margins of a class 5 composite resin restoration should be beveled to decrease microleakage regardless of their location relative to the cementoenamel junction.
authors.affiliation: University of Indiana, School of Dentistry, Department of Operative Dentistry, Indianapolis 46202.
authors.forename: L H
authors.initials: LH
authors.lastname: Hall
authors.forename: M A
authors.initials: MA
authors.lastname: Cochran
authors.forename: M L
authors.initials: ML
authors.lastname: Swartz
mesh_terms: D003188:Composite Resins; D003737:Dental Cavity Preparation / Q000379:methods*; D003763:Dental Leakage / Q000517:prevention & control*; D003793:Dental Restoration, Permanent / Q000379:methods*; D006801:Humans
chemical_list: D003188:Composite Resins; C074741:Silux Plus