The influence of gingival health status on periodontal probing measurements. A clinical study in humans - Molina, Gustavo Otoboni; Novaes Júnior, Arthur Belém; Grisi, Márcio Fernando de Moraes; Souza, Sérgio Luis Scombatti de; Taba Júnior, Mário (Journal of the International Academy of Periodontology, 2004)