“…It is generally recommended that, if possible, the cervical margin of restorations should be located in intact enamel (Hilton et al, 1997;Ferrari et al, 1999;Summit et al, 2006;Kenyon et al, 2007). Those recommendations are based on the results of several in vitro studies, which demonstrate more microleakage when restorations have margins apical to the CEJ (Retief et al, 1992;Hasanreisoglu et al, 1996;Wibowo and Stockton, 2001;Brunton et al, 2004;da Silva et al, 2006;Campos et al, 2008;Rodrigues Junior et al, 2010). In these in vitro studies it is often claimed that microleakage is a predisposing factor in the development of secondary caries Eriksen and Pears, 1978;Campos et al, 2008) and therefore restorations with cervical margins below the CEJ are considered to have an increased risk for clinical failure due to secondary caries (Hilton et al, 1997;Summit et al, 2006;Campos et al, 2008).…”