1. Department of Dental Materials and Prosthodontics; Institute of Science and Technology; Univ Estadual Paulista; São José dos Campos Brazil
2. Nuclear and Energy Research Institute; National Nuclear Energy Commission (IPEN-CNEN/SP); Materials Science and Technology Center (CCTM); Sao Paulo Brazil
3. Department of Physiology and Pharmacology; Federal University of Lavras; Brazil
4. Discipline of Stomatology; Department of Biosciences and Oral Diagnosis; School of Dentistry; Institute of Science and Technology; Univ Estadual Paulista; São José dos Campos Brazil