title: Microleakage of class 2 Superbond-lined composite restorations with and without a cervical amalgam base.
abstract: The purposes of the present study were: 1) to assess the microleakage at the cervical margin of Superbond-lined composite restorations with and without a cervical amalgam base and compare the results to cervical margins of composite restorations lined with Scotchbond 2, and 2) to compare the quality of the occlusal margins of Superbond-lined P-50 restorations with those bonded with Scotchbond 2. Forty-eight class 2 cavities were prepared in extracted or exfoliated primary molars. The teeth were randomly divided into three groups and restored as follows: Group A, amalgam + Superbond + P-50 (sandwich); Group B, Superbond + P-50; Group C, Scotchbond 2 + P-50 (control). Marginal leakage was assessed by the degree of dye penetration on sections of the restored teeth. The occlusal margins presented no or minimal leakage (degrees 0 and 1) in 53% of Group A restorations, 60% of Group B, and 44% of Group C. These differences were not statistically significant (P<0.05). The cervical margins showed moderate to severe dye penetration (degrees 2 and 3) in 94% of Group A, 47% of Group B, and 87% of Group C. These differences were statistically significant (P<0.05). The amalgam/Superbond/composite interface exhibited no leakage in 70% of the restorations. Although marginal leakage was not completely eliminated, Superbond exhibited significantly less leakage (P<0.05) at the cervical margins than Scotchbond 2 or amalgam with Superbond.
authors.affiliation: The Hebrew University, Hadassah Faculty of Dental Medicine, Department of Pediatric Dentistry, Jerusalem, Israel.
authors.forename: S
authors.initials: S
authors.lastname: Hovav
authors.forename: G
authors.initials: G
authors.lastname: Holan
authors.forename: I
authors.initials: I
authors.lastname: Lewinstein
authors.forename: A B
authors.initials: AB
authors.lastname: Fuks
mesh_terms: D017438:Bisphenol A-Glycidyl Methacrylate; D016009:Chi-Square Distribution; D003188:Composite Resins; D003723:Dental Amalgam; D003736:Dental Cavity Lining; D003763:Dental Leakage; D018772:Dental Marginal Adaptation; D003793:Dental Restoration, Permanent / Q000379:methods*; D006801:Humans; D008689:Methacrylates; D008963:Molar; D019279:Resin Cements; D014092:Tooth Root; D014094:Tooth, Deciduous
chemical_list: D003188:Composite Resins; D008689:Methacrylates; D019279:Resin Cements; C084543:Super Bond D-Liner; C065771:P50 composite resin; C067788:scotchbond 2; D017438:Bisphenol A-Glycidyl Methacrylate; D003723:Dental Amalgam