Purpose: This study's purpose was to evaluate the aging effect on the bond strength of 4 adhesive systems on primary dentin 24 hours and 6 months after bonding.
Methods: The crowns of extracted, caries-free primary molars were grounded and flat surfaces were prepared and distributed into 4 groups (n=7-9). The adhesives Scotchbond Multi-purpose (SMP), Single Bond (SB), Clearfil SE Bond (CSB), and Adper Prompt L-Pop (APL) were applied with the composite resin Filtek Z-250. Specimens were stored in distilled water (37°C/24h), the crowns were sectioned, and 0.8-mm² resin-dentin sticks were obtained and divided into 2 groups: (1) 24h; and (2) 6m. Each group's specimens were tested under tensile at 0.5 mm/minute until they fractured. The fractured sticks were examined by scanning electron microscopy. The data were analyzed by 2-way repeated measures: analysis of variance; Tukey's test (P<.05); and Kruskal-Wallis test (P<.05).
Results: The mTBS (MPa) means values were: SMP=33.28 (2.05), SB=23.27 (4.78), APL=20.64 (10.66), and CSB=18.94 (11.94) for the 24-hour group; and SMP=30.59 (6.29), SB=22.39 (5.9), CSB=21.50 (10.67), and APL=17.19 (6.88) for the 6-month group. The most frequent fracture type found was cohesive failure of the adhesive and mixed, with no statistically significant difference found between the groups.
Conclusions: Resin bond strength on primary dentin was not influenced by aging for the adhesive systems tested.
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