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 .
Survival rates and reasons for failure of posterior composite restorations in multicentre clinical trial.
n a multicentre clinical trial consisting of 12 centres , 232 amalgam and 932 composite Class I and Class II restorations were placed in 447 adult patients . At the 4-year review 76 per cent of patients with 71 per cent of the restorations were retrieved . In 8 centres after 4 years and 4 centres after 5 years a total of 12 amalgam  and 92 Occlusin restorations  had been replaced , having been considered to have failed . The reasons for failure were classified into three types : Type 1 , related to the restoration ( loss of material , recurrent caries and unacceptable marginal adaptation ) ; Type 2 , related to the restorative process ( pulpal involvement , primary caries , tooth fracture and unacceptable contact ) and Type 3 , caused by external factors . A greater proportion of the restorations of Occlusin were replaced than the restorations of amalgam . For the restorations of Occlusin the reasons for failure were : Type 1 , 59 per cent ; Type 2 , 32 per cent and Type 3 , 9 per cent . Loss of material and recurrent caries accounted for the failure of 35 and 13 restorations of Occlusin respectively . The main Type 2 reasons for failure of the restorations of Occlusin were pulpal involvement ( 16 restorations ) and primary caries ( 9 restorations ) . The overall 4-year survival of Occlusin restorations relative to Type 1 and to Type 1 + Type 2 reasons for failure was 96 per cent and 93 per cent respectively . The centre was found to have a significant influence on the survival rate in both analyses
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 .