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Dent. J. 2014, 2(2), 52-64; doi:10.3390/dj2020052

SEM Evaluation of Internal Adaptation of Bases and Liners under Composite Restorations

Department of Operative Dentistry, School of Dentistry, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
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Received: 17 February 2014 / Accepted: 25 March 2014 / Published: 4 April 2014
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Abstract

The aim of this study was to evaluate the interfacial microgaps generating between different materials and between materials and dentin after polymerization of the composite restorations, using SEM. Methods: The materials investigated were a composite, an adhesive, a RMGI, and a calcium hydroxide. Thirty third molars were selected and two circular class V cavities (5 mm × 3 mm) for each tooth were made. The teeth were randomly assigned into six groups and restored with a combination of the materials. The specimens were subjected to thermocycling and each tooth was sectioned mesiodistally in two halves. Each half was sectioned along the longitudinal axis through the center of the restorations to obtain a slice of 2 mm. The specimens were examined under SEM. The interfaces between the liners, the liners and dentin, and between the liners and the composite were examined for microgaps. Results: The results showed that there was not any significant difference in the mean width of microgaps in the interfaces between Dycal-dentin and Vitrebond-dentin (p>0.05). However, the width of microgaps in the interfaces between dentin-Clearfil Tri-S Bond was significantly smaller (p<0.05). The use of Clearfil Tri-S Bond reduced the possibility of microgap formation between the bonded interface and the materials tested.
Keywords: interfacial microgaps; SEM evaluation; polymerization shrinkage; bases and liners interfacial microgaps; SEM evaluation; polymerization shrinkage; bases and liners
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Dionysopoulos, D.; Koliniotou-Koumpia, E. SEM Evaluation of Internal Adaptation of Bases and Liners under Composite Restorations. Dent. J. 2014, 2, 52-64.

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