1. Department of Periodontology/Implantology, Dental School, Federal University of Uberlândia-UFU, Uberlândia 38405-266, Brazil
2. Department of Diagnosis and Surgery, Univ. Est. Paul.-UNESP, Araraquara 14801-903, Brazil
3. Instituto Latino Americano de Ensino e Pesquisa Odontológico-ILAPEO, Curitiba 80710-150, Brazil
4. Univ. Sagrado Coração, Bauru 17011-160, Brazil