No overall effect was revealed in the meta-analyses , meaning that no influence of the  ER or SE strategy on POS .
SIGNIFICANCE The type of adhesive strategy ( ER or SE ) for posterior resin composite restorations does not influence the risk and intensity of POS .
OBJECTIVES A systematic review and meta- analysis were performed on the risk and intensity of postoperative sensitivity ( POS ) in posterior resin composite restorations bonded with self-etch ( SE ) and etch- and -rinse ( ER ) adhesives .
2-year clinical evaluation of Class I posterior composites.
PURPOSE To clinical ly evaluate different br and s of resin composites in Class I restorations . MATERIAL S AND METHODS A total of 120 Class I cavities were prepared in permanent molars and restored with  four posterior resin composites : Clearfil Photo Posterior , Z100 , Herculite XR , and Heliomolar RO . The restorations were evaluated at baseline , 1 and 2 years using the USPHS criteria . RESULTS After 1 year , Z100 restorations were rated Alfa in all tested criteria . Clearfil PP , Herculite XR and Heliomolar RO showed slight changes in color match , anatomic form , and marginal adaptation . After 2 years , no significant difference was found in the evaluation of cavosurface discoloration for all tested material s. Z100 and Herculite XR were significantly more color stable than Clearfil PP and Heliomolar RO . The anatomic form evaluation showed Z100 with a significantly higher value than other groups . Heliomolar RO revealed the lowest percentage of marginal adaptation
No overall effect was revealed in the meta-analyses , meaning that no influence of the  ER or SE strategy on POS .
SIGNIFICANCE The type of adhesive strategy ( ER or SE ) for posterior resin composite restorations does not influence the risk and intensity of POS .
OBJECTIVES A systematic review and meta- analysis were performed on the risk and intensity of postoperative sensitivity ( POS ) in posterior resin composite restorations bonded with self-etch ( SE ) and etch- and -rinse ( ER ) adhesives .