Microleakage in primary teeth restored by conventional or bonded amalgam technique.

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Myaki, S. I.
Rodrigues, C. R.
Raggio, D. P.
Flores, T. A.
Matson, M. R.

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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.



biomedical and dental materials, copal rosin varnish, dental alloy, dentin bonding agent, methacrylic acid derivative, One Step dentin bonding system, One-Step dentin bonding system, plant resin, resin, resin cement, resinomer, Scotchbond Multi Purpose Plus, Scotchbond Multi-Purpose Plus, comparative study, deciduous tooth, dental bonding, dental surgery, human, incisor, maxilla, methodology, nonparametric test, tooth disease, Composite Resins, Dental Amalgam, Dental Bonding, Dental Cavity Lining, Dental Leakage, Dental Materials, Dental Restoration, Permanent, Dentin-Bonding Agents, Humans, Incisor, Maxilla, Methacrylates, Resin Cements, Resins, Plant, Statistics, Nonparametric, Tooth, Deciduous

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Brazilian dental journal, v. 12, n. 3, p. 197-200, 2001.