Conclusions ART single-surface restorations  presented high survival percentages in both primary and permanent posterior teeth , whilst ART multiple-surface restorations presented lower survival percentages .
ART sealants presented a high-caries-preventive effect .
Clinical relevance ART is an effective evidence -based option for treating and preventing carious lesions in primary and permanent posterior teeth
Objective The aim of the present study is to up date the results of two previous meta-analyses , published in 2006 and 2012 , on the survival percentages of  atraumatic restorative treatment ( ART ) restorations and ART sealants .
The current meta- analysis includes Chinese publications not investigated before .
A study on the survival of primary molars with intact and with defective restorations.
BACKGROUND Failed restorations in primary teeth are not always re-restored . Is re-restoration not required anymore ? OBJECTIVE To compare survival rates of primary molars with intact and defective amalgam and ART restorations . METHODS A total of 649 restored primary molars , of which 162 were assessed with defective restorations for mechanical reasons , from a cluster-r and omised controlled clinical trial , were followed up over a period of 3.5 years . Restored primary molars , extracted because of dental sepsis or toothache , were considered a failure . Primary molars with defective restorations were followed up from the time they were assessed defective . Data were analysed using PHREG model with frailty correction , Wald test , t-test , and jackknife procedure . RESULTS The survival rate of primary molars with intact restorations ( 96.3 % ) was statistically significantly higher than that of primary molars with defective restorations ( 75.9 % ) over a 3-year period ( P < 0.0001 ) . Neither the effect of treatment protocol ( amalgam or ART ) ( P = 0.05 ) nor the type of surface ( single or multiple ) ( P = 0.73 ) was observed with respect to the survival rate of restored primary molars . CONCLUSIONS Survival rates for primary molars with intact and defective amalgam and ART restorations were high . The 3-year survival rate of primary molars with intact restorations was significantly higher than that of primary molars with defective restorations
Conclusions ART single-surface restorations  presented high survival percentages in both primary and permanent posterior teeth , whilst ART multiple-surface restorations presented lower survival percentages .
ART sealants presented a high-caries-preventive effect .
Clinical relevance ART is an effective evidence -based option for treating and preventing carious lesions in primary and permanent posterior teeth
Objective The aim of the present study is to up date the results of two previous meta-analyses , published in 2006 and 2012 , on the survival percentages of  atraumatic restorative treatment ( ART ) restorations and ART sealants .
The current meta- analysis includes Chinese publications not investigated before .