J Korean Acad Conserv Dent.  2010 May;35(3):164-172. 10.5395/JKACD.2010.35.3.164.

Influence of rebonding procedures on microleakage of composite resin restorations

• Lee MA
• Seo DK
• Son HH
• Cho BH

• KMID: 2294342
• DOI: http://doi.org/10.5395/JKACD.2010.35.3.164

Abstract

During a composite resin restoration, an anticipating contraction gap is usually tried to seal with low-viscosity resin after successive polishing, etching, rinsing and drying steps, which as a whole is called rebonding procedure. However, the gap might already have been filled with water or debris before applying the sealing resin. We hypothesized that microleakage would decrease if the rebonding agent was applied before the polishing step, i.e., immediately after curing composite resin. On the buccal and lingual surfaces of 35 extracted human molar teeth, class V cavities were prepared withthe occlusal margin in enamel and the gingival margin in dentin. They were restored with a hybrid composite resin Z250 (3M ESPE, USA) using an adhesive AdperTM Single Bond 2 (3M ESPE). As rebonding agents, BisCover LV (Bisco, USA), ScotchBond Multi-Purpose adhesive (3M ESPE) and an experimental adhesive were applied on the restoration margins before polishing step or after successive polishing and etching steps. The infiltration depth of 2% methylene blue into the margin was measured using an optical stereomicroscope. The correlation between viscosity of rebonding agents and mciroleakage was also evaluated. There were no statistically significant differences in the microleakage within the rebonding procedures, within the rebonding agents, and within the margins. However, when the restorations were not rebonded, the microleakage at gingival margin was significantly higher than those groups rebonded with 3 agents (p < 0.05). The difference was not observed at the occlusal margin. No significant correlation was found between viscosity of rebonding agents and microleakage, except very weak correlation in case of rebonding after polishing and etching at gingival margin (r = -0.326, p = 0.041).

Keyword

Rebonding procedure; Microleakage; Composite resin restoration; Bonding resin; Viscosity

MeSH Terms

Acrylates
Adhesives
Bisphenol A-Glycidyl Methacrylate
Chimera
Contracts
Dental Enamel
Dentin
Humans
Methylene Blue
Molar
Resin Cements
Tooth
Viscosity
Acrylates
Adhesives
Bisphenol A-Glycidyl Methacrylate
Methylene Blue
Resin Cements

Figure

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  Figure 1 Depth of dye penetration (C, cervical margin of non-etched side; C etch, cervical margin of etched side; O, occlusal margin of non-etched side; O etch, occlusal margin of etched side).

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