الفهرس 
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Abstract
Recent advances in RBC technology, especially with regard to new monomers,
translucency, initiator systems and filler technology, address these shortcomings at least
partially and have led to the introduction of bulk-fill RBCs.
Bulk-fill RBCs can be defined as composites that can be properly cured in a single layer
of (mostly) a 4-mm thickness. It has been developed to simplify the rather time-consuming
incremental technique. Manufacturers claim that, opposed to conventional composites, bulk-fill
composites generate a lower polymerization shrinkage stress and have higher light transmission
properties due to reduction of light scattering at the filler–matrix.
The aim of this study is to evaluate clinically and laboratory study the effect of
different application techniques of bulk fill composite resin on improving the outcome and
the longevity of dental composites in the everyday practice of dental practitioners.
Sample: 40 patients will be conveniently selected to participate in this study where
each patient have at least 1 posterior teeth with proximal caries (total number of teeth =40).
For the in vivo evaluation
Class II cavities will be prepared in forty selected patients. Each patient will receive
one prepared tooth; according to the method of bulk fill composite application
Test group 1, n=10 Sonicfill system,
Test group 2, n=10 TetricN Ceram bulk fill,
Test group 3, n=10 Surefill SDR bulkflow
Control group 4, n=10 TetricN Ceram incremental layering technique.