Avaliação in vitro da escovação na formação de lesões cervicais não cariosas por meio de interferômetro a laser

Abstract

Noncarious cervical lesions (NCL) are considered of multifactorial origin, associated, normally, to inadequate brushing. This study evaluated, in vitro, the simulated brushing influence on NCL formation. Fifteen human premolar had been submitted to brushing in the region of the cementoenamel junction using brushes with hard, medium and soft bristles, associated to toothpaste of medium abrasivity, under load of 200 g, speed of 356 rpm, during 100 min. The surface topography of the region was analyzed before and after the brushing, by means of a laser interferometer, under values of cut-off of 0.25. The initial results of roughness for dentine were: (D1) 1.25 ± 0.45, (D2) 1.12 ± 0.44, (D3) 1,05 ± 0,41 and for enamel: (E1) 1.18 ± 0.35, (E2) 1.32 ± 0.25, (E3) 1.50 ± 0.38; and after brushing the values for dentine were: (D1) 2.32 ± 1.99, (D2) 3.30 ± 0.96, and for enamel: (E1) 1.37 ± 0.31, (E2) 2.15 ± 0.90, (E3) 1.22 ± 0.47. By means of the statistical analysis of the results using Student t test and Tukey (P<.05) it can be concluded that soft, medium and hard brushes are not capable to wear enamel, while the dentine showed alteration in the superficial roughness by the action of the brushes with medium and hard bristles.