This study was approved by the research ethics committee of the School of Dentistry (University of São Paulo, Brazil) and a written informed consent will be obtained from the parents or legal guardians of the participating children. The sample size was calculated based on the minimum difference of 10% in the success rate between the control and treatment groups after 1 year of follow-up, with and α of 5% and power (strength) of 80% using paired test. As more then one tooth might be enrolled in treatment, we must add a 20% for clustering, and also 20% for possible losses.