Ação de abrasivos no esmalte humano submetido à erosão: um estudo in situ/ex vivo

Tese (doutorado) - Universidade Federal de Santa Catarina, Centro de Ciências da Saúde. Programa de Pós-Graduação em Odontologia.This in situ/ex vivo study aimed to investigate the effects of two non-fluoridated dentifrices with calcium carbonate (CaCO3) and silica (SiO2) on human permanent enamel eroded by a carbonated soft drink. During two phases over 5 days, 12 volunteers (mean age 28) used a palatal appliance with 6 enamel blocks. In each period, the appliances were immersed in the soft drink for 5 min, 4 times a day. In two moments of the erosive challenge, 2 enamel blocks were not additional treatment, 2 blocks were brushed either with a CaCO3 or SiO2 dentifrices, immediately after the erosive treatment and 2 blocks 1 h later. Brushing was made for 30 s. Between phases a 2 day washout period was followed. An in vitro study was also conducted to investigate artificial and natural saliva influence on the erosion variation. The results were expressed in enamel roughness (Ra, ìm) and morphology analysis. The eroded and abrasioned enamel blocks showed superficial roughness changes significant higher than the eroded blocks (p