1. Trent Centre for Biomaterials Research, Departments of Physics & Astronomy and Chemistry, Trent University, Peterborough, Ontario Canada K9J 7B8
2. Department
of Restorative Dentistry, Araraquara School of Dentistry, UNESP, Univ Estadual Paulista, Araraquara, SP Brazil
3. Department
of Clinical Analyses, School of Pharmaceutical Sciences, University of São Paulo, Ribeirão Preto, SP Brazil