Abstract
Background and aims. Despite the increasing demand for adhesive restorations in pediatric dentistry, polymerization
shrinkage and subsequent marginal microleakage remains a problem. The aim of this study was to evaluate of the sealing
ability of novel low-shrinkage composite silorane in class V cavity of primary canines in comparison with three types of
composite resin.
Materials and methods. Ninety-one non-carious extracted primary canines were randomly divided in six groups
(n=15). Standard class V cavities were prepared on the buccal surface of each tooth that the occlusal margin was in the
enamel and the cervical margin extending 1 mm below the cemento-enamel junction. The preparations were restored with
the different composite materials in normal consistency with application the bonding in six groups (Filtek silorane; etch +
Filtek Silorane; Z250; Filtek supreme; els saremco; Aelite LS). Teeth were then exposed to thermal cycles (1000 cycles,
5°C and 55°C), sealed and immersed in a 0.5% basic fuchsine for 24 hours, and finally sectioned. Buccolingual and marginal
leakage was assessed with dye penetration.
Results. The best seal were obtained with etch + Filtek Silorane (P < 0.05) and the weakest seal with Z250 composite restorations
(P > 0.05). Except for etch + silorane, there was no significant differences in sealing ability (P > 0.05), and in the
microleakage degree at the cementum and enamel margins (P > 0.05) between the groups.
Conclusion. According to the results, low-shrinkage silorane composite restorations with etching the cavity provide the
highest seal in primary teeth.