1. Daniela Venturini, MSc student, School of Dentistry, Federal University of Pelotas, RS, Brazil
2. Maximiliano Sérgio Cenci, DDS, MSc, PhD student, Faculty of Dentistry of Piracicaba, State University of Campinas, SP, Brazil
3. Flávio Fernando Demarco, DDS, PhD, associate professor, Department of Operative Dentistry, School of Dentistry, Federal University of Pelotas, RS, Brazil
4. Guilherme Brião Camacho, DDS, PhD, associate professor, Department of Operative Dentistry, School of Dentistry, Federal University of Pelotas, RS, Brazil
5. John M Powers, PhD, Director, Houston Biomaterials Research Center, University of Texas Dental Branch at Houston, Houston, TX, USA