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Influence of rebonding procedures on microleakage of composite resin restorations


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Influence of rebonding procedures on microleakage of composite resin restorations

Article information

Restor Dent Endod. 2010;35(3):164-172
Publication date (electronic) : 2010 May 31
doi : https://doi.org/10.5395/JKACD.2010.35.3.164
Mi-Ae Lee, Duck-Kyu Seo, Ho-Hyun Son, Byeong-Hoon Choorcid_icon
Department of Conservative Dentistry, School of Dentistry, Seoul National University, Seoul, Korea.
Corresponding Author: Byeong-Hoon Cho. Department of Conservative Dentistry, School of Dentistry, Seoul National University 275-1 Yeongeon-Dong, Jongno-Gu, Seoul, 110-768, Korea. Tel: 82-2-2072-3514, Fax: 82-2-2072-3859, chobh@snu.ac.kr
Received 2010 March 17; Revised 2010 April 10; Accepted 2010 April 16.

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).

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

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Article information Continued

Copyright © 2010 Korean Academy of Conservative Dentistry

Figure 1

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).

Table 1

Composition of the materials used in this study

Table 1

Table 2

Margin treatment groups

Table 2

Table 3

The mean microleakage of tested specimens (Mean ± SD)

Table 3

*Bis, Biscover LV; MP, Scotchbond Multipurpose Plus; EA, Experimental adhesive; 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.

†The viscosity of control group was assumed to be 0.001 for calculating correlation coefficient, because the smaller numbers only affected a very small change.