The eugenol-free ZO cement Cavit sets in contact
with moisture, and has produced conflicting sealing
results (Uranga et al. 1999, Jenkins et al. 2006, Saua´ia
et al. 2006). The hygroscopic properties result in
expansion of the material, potentially sealing the
tooth/filling interface (Cruz et al. 2002, Saua´ia et al.
2006), and might explain the absence of interfacial dye
penetration in 70% of the samples. The presence of dye,
though, was observed in the material itself, confirming