Status of ten self‐etch adhesives for bonding to dentin of primary teeth

Objective Aim of this in vitro study was to compare self‐etch adhesives regarding microtensile bond strength (μ‐ TBS ) to dentin of primary teeth. Methods Fifty freshly extracted primary molars were ground to expose caries‐free dentin. Specimens were bonded with ten self‐etch adhesives (i B ond self‐etch/ H eraeus, X eno V +/ D entsply, G ‐ B ond, G aenial B ond/ GC , B eautiBond/ S hofu, A dhe SE O ne F / I voclar V ivadent, A dper E asy B ond/3 M ESPE , C learfil SE B ond/ K uraray, O pti B ond XTR / K err H awe, P rime& B ond NT / D entsply). After 24‐h storage (distilled water, 37°C), resin–dentin beams were cut and 848 resin–dentin sticks were subjected to μ‐ TBS tests. Fracture analysis was carried out at 40× magnification under a fluorescence microscope and under a SEM . Results Three adhesives (i B ond SE , C learfil SE B ond, P rime& B ond NT ) did not suffer pre‐test failures ( PTF ). A dhe SE O ne F revealed the largest portion of PTF (28%; P  < 0.05). Clearfil SE B ond and O pti B ond XTR exhibited more cohesive fractures than the other adhesives (77.3% vs 64.8%; P  < 0.05). i B ond SE , G aenial B ond, C learfil SE , and O pti B ond XTR achieved μ‐ TBS of >60 MPa, whereas X eno V + and A dhe SE O ne F ranged only at ~20 MPa ( P  < 0.05). Conclusion Within the limits of this study, the self‐etch adhesives under investigation proved different extents of initial μ‐ TBS to primary dentin with i B ond SE , G aenial B ond, C learfil SE , and O pti B ond XTR having been most successful.