title: Microleakage in primary teeth restored by conventional or bonded amalgam technique.
abstract: The aim of this in vitro study was to evaluate marginal leakage in class V restorations in primary teeth restored with amalgam, using three different techniques. Thirty maxillary anterior primary teeth, clinically sound and naturally exfoliated, were used. In group 1 (n = 10), two thin layers of a copal varnish (Cavitine) were applied. In group 2 (n = 10), Scotchbond Multi-Purpose Plus, a dual adhesive system, was used according to manufacturer instructions. In group 3 (n = 10), One-Step adhesive system in combination with a low-viscosity resin (Resinomer) were used according to manufacturer instructions. All samples were restored with a high-copper dental amalgam alloy (GS 80, SDI). After restoration, the samples were stored in normal saline at 37 degrees C for 72 h. The specimens were polished, thermocycled (500 cycles, 5 degrees and 55 degrees C, 30-s dwell time) and impermeabilized with fingernail polish to within 1.0 mm of the restoration margins. The teeth were then placed in 0.5% methylene blue for 4 h. Finally, the samples were sectioned and evaluated for marginal leakage. The Kruskal-Wallis test showed that the filled adhesive resin (group 3) had the least microleakage. There was no significant difference between groups 1 and 2.
authors.affiliation: Discipline of Pediatric Dentistry, Faculty of Dentistry, UNESP, São José dos Campos, SP, Brazil. infantil@fosjc.unesp.br
authors.forename: S I
authors.initials: SI
authors.lastname: Myaki
authors.forename: C R
authors.initials: CR
authors.lastname: Rodrigues
authors.forename: D P
authors.initials: DP
authors.lastname: Raggio
authors.forename: T A
authors.initials: TA
authors.lastname: Flores
authors.forename: M R
authors.initials: MR
authors.lastname: Matson
mesh_terms: D003188:Composite Resins; D003723:Dental Amalgam; D001840:Dental Bonding / Q000379:methods*; D003736:Dental Cavity Lining; D003763:Dental Leakage / Q000517:prevention & control*; D003764:Dental Materials; D003793:Dental Restoration, Permanent / Q000379:methods*; D017220:Dentin-Bonding Agents; D006801:Humans; D007180:Incisor; D008437:Maxilla; D008689:Methacrylates; D019279:Resin Cements; D012116:Resins, Plant; D018709:Statistics, Nonparametric; D014094:Tooth, Deciduous
chemical_list: C103506:Bis-GMA, BPDM, HEMA dental-bonding resin; D003188:Composite Resins; D003764:Dental Materials; D017220:Dentin-Bonding Agents; D008689:Methacrylates; D019279:Resin Cements; D012116:Resins, Plant; C425844:Scotchbond Multi-Purpose Plus; C110709:resinomer; D003723:Dental Amalgam; C041292:copal rosin varnish