title: Assessment in vitro of brushing on dental surface roughness alteration by laser interferometry.
abstract: Noncarious cervical lesions (NCCLs) are considered to be of multifactorial origin, normally associated with inadequate brushing. This study assessed the influence in vitro of simulated brushing on NCCL formation. Fifteen human premolars were submitted to brushing in the cementoenamel junction region, using hard-, medium- and soft-bristled brushes associated with a toothpaste of medium abrasiveness under a 200 g load, at a speed of 356 rpm for 100 minutes. The surface topography of the region was analyzed before and after brushing, by means of a laser interferometer, using "cut-off" values of 0.25 and considering roughness values in mm. The initial roughness (mm) results for dentin (D / bristle consistency: 1--soft, 2--medium and 3--hard) were as follows: (D1) 1.25 +/- 0.45; (D2) 1.12 +/- 0.44; (D3) 1.05 +/- 0.41. For enamel (E / bristle consistency: 1--soft, 2--medium and 3--hard), the initial results were: (E1) 1.18 +/- 0.35; (E2) 1.32 +/- 0.25; (E3) 1.50 +/- 0.38. After brushing, the following were the values for dentin: (D1) 2.32 +/- 1.99; (D2) 3.30 +/- 0.96; (D3) Over 500. For enamel, the values after brushing were: (E1) 1.37 +/- 0.31; (E2) 2.15 +/- 0.90; (E3) 1.22 +/- 0.47. Based on the results of the ANOVA and Tukey statistical analyses (a = .05) it was concluded that soft, medium and hard brushes are not capable of abrading enamel, whereas dentin showed changes in surface roughness by the action of medium- and hard-bristled brushes.
authors.affiliation: School of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, Brazil. aleazevedopa@yahoo.com.br
authors.forename: Alessandra Miranda de
authors.initials: AM
authors.lastname: Azevedo
authors.forename: Heitor
authors.initials: H
authors.lastname: Panzeri
authors.forename: Célio Jesus do
authors.initials: CJ
authors.lastname: Prado
authors.forename: José Daniel Biasoli
authors.initials: JD
authors.lastname: De-Mello
authors.forename: Carlos José
authors.initials: CJ
authors.lastname: Soares
authors.forename: Alfredo Julio
authors.initials: AJ
authors.lastname: Fernandes-Neto
mesh_terms: D000704:Analysis of Variance; D003742:Dental Devices, Home Care; D003743:Dental Enamel; D003802:Dentifrices / Q000009:adverse effects*; D003804:Dentin / Q000473:pathology; D006244:Hardness; D006801:Humans; D014072:Tooth Abrasion / Q000209:etiology*; D019237:Tooth Cervix / Q000187:drug effects / Q000473:pathology; D014099:Toothbrushing / Q000009:adverse effects*; D014100:Toothpastes / Q000009:adverse effects
chemical_list: D003802:Dentifrices; D014100:Toothpastes