1. Department of Dental Materials and Prosthodontics São Paulo State University (UNESP) School of Dentistry Araçatuba São Paulo Brazil
2. Department of Operative Dentistry Endodontics and Dental Materials, Bauru School of Dentistry, University of São Paulo Bauru Sao Paulo Brazil
3. Laboratory of Technological Plasmas São Paulo State University (UNESP) Sorocaba Brazil
4. Faculty of Dentistry University of Toronto Toronto Canada