Estudo "in vitro" da rugosidade superficial de materiais restauradores submetidos a ensaio de escovação
Susana Maria Werner Samuel
DATA DE PUBLICAÇÃO
The purpose of this study was to evaluate the surface roughness oí direct restorative materiaIs (composite resins, glass ionomers and amalgam) submitted to a in vitro toothbrushing test. Three composite resins (Herculite XR, Prisma APH and P50), two glass ionomers (Vidrion R and Chelon Fil) and an amalgam (Dispersalloy) were studied. Eigth samples of each material were obtained in plaxglass matrices measuring 20 x 10 x 2 mm. The tooth brushing machine had eight containers and the specimens were fixed in the botton of them. The brushes used were the Prevent 30 (Anakol) extra-soft type. These brushes wete glued to the stainless steel brush holder. The load af the brush was 200 g. The toothpaste used for these experimet was Kolynos Super Branco (Anakol), and the slurry was made by mixing 6 ml of distilled water and 6 g of toothpaste. Seven of the eight containers, with the specimens in position, received the slurry, and the last, only distilled water. The eletric motor produced 250 strokes / min and the machine was activated until the counter registered 30,000 strokes. The brushes and the slurry were substituted for each material. Concluded the brushing cycle of two hours the specimens were removed from the machine, washed in tap water and stored at 37ºC and 100% relative umidity of the air until measuring the surface roughness. The specimens were then placed on a profilometer (Perth-O-Meter M2P / Perthen-Mahr) to measure the surface roughness, in micrometers, by the Ra parameter. A total of 288 readings were made in 48 samples. The statistic analyses of the results showed that the brushing with extra-soft brush and water didn t affect the surface topography of the analised materials. But; when the toothpaste was associated to the brushes, all materials showed an alteration of the surface topography. The material with the roughest inicial surface was Dispersalloy (0,6394 μm), followed by Vidrion R (0,2697 μm), Chelon Fil (0,1760 μm), Herculite XR (0,0491 μm), P50 (0,0342 μm) and Prisma APH (0,0338 μm). After the toothbrushing test, the roughest material was Vidrion R (1,2508 μm), followed by Herclliite XR (1,0300 μm), Chelon Fil (0,6210 μm), Prisma APH (0,4542 μm), Dispersalloy (0,4082 μm) and P50 (0,2754 μm). In all materials an increase of the roughness occured except for the amalgam in which the inicial roughness was reduced. There was no statistical difference between the surface of the amalgam when compared with the materiais that showed the less rough surface after brushing (Prisma APH and P50).
ACESSO AO ARTIGOhttp://libdigi.unicamp.br/document/?code=vtls000065555
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