Sealing ability of new generation adhesive systems in primary teeth: an in vitro study.

Purpose: This study evaluated the sealing ability of different types of restorative-adhesive combinations on deciduous molars in vitro.
Methods: Facial and lingual Class V cavities were prepared in 120 primary teeth. They were randomly divided into 8 groups of N= 15, in which different adhesives were used (XE=Xeno III; LP=Adper Prompt L Pop; IB=I Bond; SB=Scotch Bond 1; EP=Etch & Prime 3.0; AS=AdheSE; OB=Optibond Solo plus self-etch primer; CS=Clearfil SE Bond). All cavities were restored with composite Z 250. After thermocycling and immersion in 2% methylene blue, the dye penetration was evaluated under a microscope.
Results: In enamel and in cementum: the best seals were obtained with XE and LP, followed by CS, AS, IB, OB, SB, and EP (P=.001). No significant differences were recorded in the microleakage degree between the cementum and the enamel margins (P=.40).
Conclusions: In this in vitro model, Xeno III and Adper Prompt L Pop provided the best seals both at the enamel and the cementum margins of Class V cavities in primary molars.