Elsevier

Dental Abstracts

Volume 59, Issue 2, March–April 2014, Page 109
Dental Abstracts

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Amalgam−composite resin restorations

https://doi.org/10.1016/j.denabs.2013.11.048Get rights and content

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Background

Composite resin restorations can fail as stress generated in the tooth-restoration interface after polymerization shrinkage results in a disrupted margin, which is vulnerable to bacterial aggregation, microleakage, and secondary caries. Bonding on the cervical surface of Class II composite restorations can be compromised by altered etching patterns, which degrade the bond, especially in permanent teeth. Composite placement is a technique-sensitive procedure with the potential for marginal

Methods

Thirty-five freshly extracted premolars and permanent molars that were free of caries and fractures were prepared with mesio-occlusal-distal (MOD) cavities. The distal proximal box was restored with amalgam up to the height of the pulpal floor. Dental tissues were etched using 37% acid and a bonding agent was applied and cured. Composite resin was layered in the mesial proximal box and occlusally and subjected to light cure. Specimens were kept in saline solution at room temperature for 1 week

Results

Microleakage at the interface of the amalgam and composite resin was less than that around amalgam or around composite.

Discussion

Fresh amalgam has a high surface tension, which can negatively affect surface wettability. However, composite resin was inserted after just 5 minutes to mimic a clinical situation. The composite was applied in layers to minimize polymerization shrinkage. High-copper amalgam was placed, requiring no oxidation solution. The use of amalgam provided a good marginal seal, and gradual oxide deposition produced ongoing autosealing over time. The result was less microleakage at the amalgam−composite

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Tolidis K, Boutsiouki C, Gerasimou P: Microleakage in combined amalgam/composite resin restorations in MOD cavities. Braz J Oral Sci 12:100-104, 2013

Reprints available from C Boutsiouki, 12 Kallidopoulou Str, 54642, Thessaloniki, Greece; fax: +30 2310863631; e-mail: [email protected]

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