The meta- analysis of the data in the included studies demonstrated that only one variable ( marginal adaptation after 12 months ) showed statistically significant outcomes , in which methacrylates-based composites presented significantly better results than resin composites containing modified monomers .
The good level of the scientific evidence as well as the overall low risk of bias of the included studies indicate that composites with silorane , ormocer or bulk-fill type modified monomers have a clinical performance similar to conventional resin composites
Polymerization shrinkage of resin composite can compromise the longevity of restorations .
To minimize this problem , the monomeric composition of composites have been modified .
The objective of this study was to conduct a meta- analysis to assess the clinical behavior of restorations performed with low polymerization shrinkage resin composite  in comparison with traditional methacrylates-based resin composite .
Randomized controlled trial of the 2-year clinical performance of a silorane-based resin composite in class 1 posterior restorations.
PURPOSE To compare the 2-year clinical performance of a silorane-based resin composite with that of an established nanoceramic resin composite for class 1 posterior restorations . METHODS In this r and omized controlled study , 100 class 1 molar cavities were prepared in 50 subjects . Each subject received a restoration with Filtek Silorane and Ceram . X Duo in different quadrants . The restorations were evaluated using the modified USPHS criteria at baseline and 6 , 12 , and 24 months . Parametric changes over the 2-year period were assessed with the Friedman test . The baseline and recall scores were compared by using the Wilcoxon signed-rank test ( P < 0.05 ) . RESULTS No subject developed secondary caries or postoperative sensitivity . Further , the resin composites showed no significant differences in all the evaluated parameters over 2 years ( P > 0.05 ) . At 2 years , four Filtek Silorane and seven Ceram . X Duo restorations had Bravo scores for anatomic form , marginal adaptation , and surface texture ( P < 0.05 ) ; however , these changes were mainly the effect of scoring shifts from Alfa to Bravo . Overall , both material s showed good clinical results with predominantly Alfa scores
The meta- analysis of the data in the included studies demonstrated that only one variable ( marginal adaptation after 12 months ) showed statistically significant outcomes , in which methacrylates-based composites presented significantly better results than resin composites containing modified monomers .
The good level of the scientific evidence as well as the overall low risk of bias of the included studies indicate that composites with silorane , ormocer or bulk-fill type modified monomers have a clinical performance similar to conventional resin composites
Polymerization shrinkage of resin composite can compromise the longevity of restorations .
To minimize this problem , the monomeric composition of composites have been modified .
The objective of this study was to conduct a meta- analysis to assess the clinical behavior of restorations performed with low polymerization shrinkage resin composite  in comparison with traditional methacrylates-based resin composite .