The included studies reported few , if any , endodontic complications .
Little or no differences emerged between teeth restored with  composite resins  and those restored with amalgam .
Composite resin is used extensively for restoration of teeth with vital pulps .
Although cell culture studies have disclosed harmful effects on pulpal cells , any untoward clinical effects , manifest as adverse pulpal responses , have yet to be determined .
This study comprises a systematic review , design ed to address the question of whether the risk of endodontic complications is greater with  composite resin restorations  than with  other restorative material s  , such as  amalgam .
Effect of posterior resin composite placement technique on the resin-dentin interface formed in vivo.
OBJECTIVE The aim of this study was to evaluate the morphology of the resin-dentin interface formed in vivo with two posterior resin composite placement techniques ( incremental and bulk ) . METHOD AND MATERIAL S After approval from the patients , 12 Class II cavities with margins in enamel ( 2.5 x 2.5 x 4.5 mm ) were prepared in caries-free premolars scheduled to be extracted for orthodontic reasons ( n = 6 ) . The cavities were restored with Single Bond + Filtek P60 as a bulk condensable technique or Single Bond + Filtek Z250 as an oblique incremental technique . After 1 week , the teeth were extracted with minimal trauma to the restored area . After the teeth were sectioned , a polyvinyl siloxane impression was taken from the resin-dentin interface to control for artifacts created during preparation for scanning electron microscopy . The specimens were subsequently processed for and observed under a scanning electron microscope to assess gap formation . RESULTS The mean percentage of gap formation was 6.1 % for teeth restored with the incremental placement technique and 18.7 % for teeth restored with the bulk placement technique . The difference was statistically significant . CONCLUSION The incremental placement of posterior resin composites may still provide better seal than the new bulk condensable technique
The included studies reported few , if any , endodontic complications .
Little or no differences emerged between teeth restored with  composite resins  and those restored with amalgam .
Composite resin is used extensively for restoration of teeth with vital pulps .
Although cell culture studies have disclosed harmful effects on pulpal cells , any untoward clinical effects , manifest as adverse pulpal responses , have yet to be determined .
This study comprises a systematic review , design ed to address the question of whether the risk of endodontic complications is greater with  composite resin restorations  than with  other restorative material s  , such as  amalgam .