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

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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 (iBond self-etch/Heraeus, Xeno V+/Dentsply, G-Bond, Gaenial Bond/GC, BeautiBond/Shofu, AdheSE One F/Ivoclar Vivadent, Adper Easy Bond/3M ESPE, Clearfil SE Bond/Kuraray, OptiBond XTR/KerrHawe, Prime&Bond NT/Dentsply). 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 (iBond SE, Clearfil SE Bond, Prime&Bond NT) did not suffer pre-test failures (PTF). AdheSE One F revealed the largest portion of PTF (28%; P < 0.05). Clearfil SE Bond and OptiBond XTR exhibited more cohesive fractures than the other adhesives (77.3% vs 64.8%; P < 0.05). iBond SE, Gaenial Bond, Clearfil SE, and OptiBond XTR achieved μ-TBS of >60 MPa, whereas Xeno V+ and AdheSE One 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 iBond SE, Gaenial Bond, Clearfil SE, and OptiBond XTR having been most successful.International Journal of Paediatric Dentistry 2014; 24: 192–199

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