1. Department of Operative Dentistry and Dental Materials Dental School Federal University of Uberlândia Uberlândia Brazil
2. Department of Periodontology and implantology Dental School Federal University of Uberlândia Uberlândia Brazil
3. Department of General Dentistry College of Dentistry University of Tennessee Health Science Center Memphis TN USA
4. Department of Bioscience Research College of Dentistry University of Tennessee Health Science Center Memphis TN USA