In vitro evaluation of roughness produced by toothbrushes / toothpastes on denture base resin

Abstract

The purpose of this study was to verify the superficial roughness produced by the association toothbrush-dentifrices on acrylic resin samples. Metallic molds (47x20x2 mm) were included in metallic flasks (Safrany) and removed after the gypsum setting. The molds obtained were then, filled with heat-cured acrylic resin (Clássico). They were divided into four groups according to the used toothpaste, that is, Sorriso (Anakol), Liqui Fresh (Gessy Lever), an experimental toothpaste (specific for prosthesis) and water (control). Each group was subdivided into three sub-groups, according to the used toothbrush: Denture (Anakol, specific for prosthesis), Doc- tor (Anakol) and Oral-B 30 (Gillete do Brasil). For the brushing test, the machine was gauged with a constant speed of 250 cycles per minute. The brushing test was conducted for two hours, totalizing 30,000 brushing cycles. Three rough- ness readings were carried out in each sample with a perfilometer (Prazis Rug-03). The results were submitted to the variance analysis and the Tukey’s test. The experimental toothpaste (speci- fic for prosthesis) showed the highest roughness average, followed by Sorriso, Liqui Fresh and water, all being statistically different from each other (p<0.05). There was no statistic difference among the toothbrushes Denture, Doctor and Oral-B 30 (p>0.05). Key words: toothbrushes, dentifrices, heat cure acrylic resin, abrasion.