Microhardness testing showed that low-shrinkage silorane composites based on cationic ring-opening polymerization achieved adequate and homogeneous microhardness values in deep class II cavities when cured with two different light-curing units.
SUMMARYObjective: This study compared the microhardness of three composite resins with different organic matrices in deep class II cavities.Materials and Method: A total of 36 extracted molars were randomly assigned to six groups and standardized class II cavities were prepared. The cavity design comprised three steps in a mesiodistal direction with an increasing depth (2, 4, and 6 mm). Twelve cavities each were restored using Filtek Supreme (FS), Quixfil (QF), and Filtek Silorane (SI). The materials were applied in incremental layers of 2 mm and cured either with Halogen Translux Energy (HTE) (n¼18) or LED Bluephase C8 (LED) (n¼18). Subsequently, the specimens were cross-sectioned, and microhardness was determined in various depths and at two different distances from the matrix.Results: QF yielded the highest KHN microhardness values (92.67 6 12.77), followed by FS (65.53 6 19.52) and SI (57.67 6 8.33). Composites
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