title: Effects of desensitizing agents on dentinal tubule occlusion.
abstract: The aim of this study was to evaluate the features of dentinal tubules occlusion following application of three commercially available desensitizing agents: potassium oxalate-based / Oxa-Gel (OX), HEMA and glutaraldehyde-based / Gluma Desensitizer (GD) and acidulated phosphate fluoride-based / Nupro Gel (AF). Buccal cervical areas of twenty-four extracted human third molars were smoothed and wet-polished with SiC papers and diamond pastes, in order to simulate the clinical aspect of hypersensitive dentin cervical surfaces. The teeth were randomly divided into four groups (n=6), according to the dentin surface treatments: G1: untreated; G2: OX; G3: GD; G4: AF. Specimens were fractured in the lingual-buccal direction and prepared for SEM analysis. OX promoted tubule occlusion by crystal-like deposits in the lumen of the tubules. While GL created a thin layer over the dentin surface, AF application produced precipitates that occluded the tubules. According to the SEM analysis, all desensitizing agents were able to occlude the dentinal tubules.
authors.affiliation: Department of Restorative Dentistry, University os São Paulo.
authors.forename: César Augusto Galvão
authors.initials: CA
authors.lastname: Arrais
authors.forename: Daniel Chi Ngai
authors.initials: DC
authors.lastname: Chan
authors.forename: Marcelo
authors.initials: M
authors.lastname: Giannini