Resin cements wear resistance evaluation under brushing abrasion preceded by pH cycling simulations / Resistência ao desgate de cimentos resinosos submetidos à ciclagem de pH e escovação simulada

AUTOR(ES)

Anuradha Prakki

DATA DE PUBLICAÇÃO

2003

RESUMO

Indirect aesthetic restorations have been found to have a wide variation on its adaptation, subjecting consequently, the luting material to the oral environment degradation provided by physical, mechanical or chemical processes. Thus, theirwear resistances still worry researchers. In this context, the objective of this work was to evaluate the wear resistance of three resin luting cements, Enforce (Dentsply),Rely X (3M) and Variolink II (Vivadent) when compared to the following indirect restorative materials, Artglass (Heraeus Kulzer) and Duceram Plus (Ducera). All the material was subjected to dynamic pH cycles and to brushing simulation and the wear was detected by their weight and surface roughness changes. A hundred specimens were obtained, twenty for each material, half of them (ten for each material) was submitted to dynamic pH cycles before the brushing strokes. For the abrasion test, the specimens were subjected to 100.000 cycles of brushing with soft bristles tips (Oral B) containing dentifrice solution (Colgate) and deionized water. The weight loss was detected by the difference between the initial (before brushing strokes) and final measurements (after brushing strokes). The evaluation of surface roughness was obtained by the difference between initial and final means after five roughness readings in a Hommel Tester T 1000 testing machine. The results (ANOVA and Tukey) showed significant differences of weight loss and surface roughness among the tested materials.Duceram Plus was not influenced by pH cycling and presented the best performance after tooth brushing test. Among composite materials, Artglass and Variolink II presented better results for weight and roughness alterations followed by Rely X and Enforce. PH cycling did not influence statistically on tested materials wear resistance.

ASSUNTO(S)

resis cements escovacao dentaria (simulacao) cimentos de resina toothbrushing (simulation) cimentos dentários dental cements

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