Data analysis: all data will be processed with the open source statistics software "R" and controlled for normal distribution. Multivariate and univariate analysis of variance (MANOVAs and ANOVAs) will be used to assess within-subject change over time. A p-value less than 0.05 will be considered statistically significant. The obtained results will be published in an internationally recognized journal. If the results cannot be published in a journal, they will be available at the website of the University of the Odontology Institute. We make emphasis in that positive, negative and inconclusive results will be published.