The purpose of this study was the evaluation in vitro of marginal microleaking, present on gum’s edges of class II cavities of deciduous molars, restored with composite resin (auto and light-cured), with the use of a staining solution to verify the leaking. The prepared cavities presented enamel on gum’s edges and were restored according to four different techniques: 1) light-cured composite resin; 2) auto-cured composite resin; 3) mixed technique (auto and light-cured composite resin); and 4) glass-ionomer/composite resin. After the statistical analysis of the results, it was concluded that all the groups presented microleaking, in variable degrees. However, groups 2, 3 and 4 presented the smallest levels of leaking.
Dental leakage; Composite resins; Deciduous tooth
