1. Department of Surgery and Bucco-Maxillofacial Traumatology and Periodontology; Ribeirao Preto School of Dentistry; University of Sao Paulo - USP; Ribeirão Preto SP Brazil
2. Division of Periodontics; Department of Surgery and Integrated Clinic; Dental School of Araçatuba; UNESP - Univ. Estadual Paulista; Araçatuba SP Brazil
3. Division of Periodontics; Federal University of Ceara; Sobral CE Brazil