Class I restorations and restorations placed using rubber dam presented better AFR .
An elevated number of failures were observed due to recurrent caries , highlighting the need for professionals to work with a health-promoting approach .
BACKGROUND Several restorative material s with specific indications are used for filling cavities in primary teeth .
AIM To systematic ally review the literature in order to investigate the longevity of primary teeth restorations  and the reasons for failure .
Cariostatic effect of fluoride-containing restorative systems associated with dentifrices on root dentin.
OBJECTIVE The aim of this in vitro study was to evaluate the interaction between two sources of fluoride ( restorative systems and dentifrices ) in inhibiting artificial root caries development . METHODS One hundred and eighty tooth segments were embedded in polyester resin , and s and ed flat . Cylindrical cavities 1.0mm-deep and 1.5mm-diameter were prepared in root dentin and r and omly restored by fluoride-containing restorative systems : Ketac-fil/Espe ( Ke ) , Fuji II LC/GC Corp ( Fj ) , F2000/3 M ( F2 ) , Surefil/Dentsply ( Su ) or a control : Filtek Z250/3 M ( Z2 ) . Ten experimental groups were made to test the association among the five restorative systems and two dentifrices : with F(- ) ( Sensodyne Baking Soda ) or without F(- ) ( Sensodyne Original ) ( n=18 ) . After surface polishing , a 1mm-wide margin around the restorations was demarcated and initial dentin surface Knoop microhardness values ( KHN(i ) ) were obtained . The specimens were su bmi tted to a pH-cycling model , and to applications of slurries of dentifrice . Afterwards the final dentin surface Knoop microhardness values ( KHN(f ) ) were measured . RESULTS The differences between KHN(i ) and KHN(f ) , and the covariate KHN(i ) were considered by the ANCOVA and Tukey 's test ( alpha=0.05 ) . The interaction between restorative system and dentifrice was statistically significant ( p=0.0026 ) . All restorative systems provided some protection against artificial caries challenge when associated with the fluoride-containing dentifrice treatment . The means ( st and ard deviation ) of reductions in Knoop hardness values for systems associated with the fluoride-containing dentifrice were : Ke : 40.0(1.02)(a ) , Fj : 41.9(1.02)(b ) , F2 : 43.3(1.04)(c ) , Su : 43.5(1.00)(c ) , Z2 : 44.0(1.02)(c ) ; and with the non-fluoride-containing dentifrice were : Ke : 42.9(1.02)(a ) , Fj : 44.7(1.01)(b ) , F2 : 45.2(1.09)(bc ) , Su : 46.0(0.99)(c ) , Z2 : 46.6(0.99)(c ) ( statistical differences were expressed by different letters ) . CONCLUSION The cariostatic effect shown by the fluoride-containing dentifrice could enhance that shown by Ketac-fil and Fuji II LC , and could mask that shown by F2000
Class I restorations and restorations placed using rubber dam presented better AFR .
An elevated number of failures were observed due to recurrent caries , highlighting the need for professionals to work with a health-promoting approach .
BACKGROUND Several restorative material s with specific indications are used for filling cavities in primary teeth .
AIM To systematic ally review the literature in order to investigate the longevity of primary teeth restorations  and the reasons for failure .