comparative study of the surface roughness of ormocer-based and conventional composites estudo comparativo da rugosidade superficial entre compósitos à base de ormocer e sistemas monoméricos tradicionais

Clicks: 263
ID: 221092
2003
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Abstract
The aim of this study was to evaluate the surface roughness of two Ormocer-based resin composites before and after mechanical toothbrushing. The study compared the brands Admira and Definite with composites based on conventional monomer systems (Bis-GMA, Bis-EMA, UEDMA e TEGDMA), Z250 and A110. Eight samples of each material with 4mm in diameter and 2mm in height were prepared using a metallic mold. After 24 hours they were polished and examined with a profilometer for measurement of the initial surface roughness (Ra, mm) before mechanical toothbrushing (30,000 cycles). After toothbrushing, the samples were taken to the profilometer once again to check the final surface roughness. The results were submitted to ANOVA and Tukey test (5%). The Admira composite presented a higher mean of surface roughness before toothbrushing (0.132mm), with a statistical difference from the composite A110 (0.082mm). Definite (0.110mm) and Z250 (0.105mm) composites showed no differences between themselves or among the other composites. No statistical differences were observed after toothbrushing between the composites Definite (0.178mm), Z250 (0.187mm), Admira (0.181mm), and A110 (0.193mm). All composites showed a statistically significant increase in the surface roughness after toothbrushing.
O objetivo deste estudo foi avaliar a rugosidade superficial antes e após ensaio de escovação de dois compósitos a base de Ormocer e compará-los a compósitos a base de sistemas monoméricos tradicionais. O estudo comparou as marcas Admira e Definite com os compósitos baseados em sistemas de monoméricos tradicionais (Bis-GMA, Bis-EMA, UEDMA e TEGDMA): Z250 e A110. Oito amostras de cada material com 4 mm em diâmetro por 2 mm em altura foram confeccionadas em uma matriz metálica rosqueável. Depois de 24 horas, as amostras foram submetidas a polimento e análise da rugosidade superficial inicial (Ra, µm) através de um profilômetro antes do ensaio de escovação mecânica (30.000 ciclos). Após o ensaio de escovação as amostras foram levadas mais uma vez ao profilômetro para mensuração da rugosidade superficial final. Os resultados foram submetidos a ANOVA e ao teste de Tukey (5%). O compósito Admira apresentou a maior rugosidade superficial antes do ensaio de escovação mecânica (0,132 µm), média estatisticamente superior ao compósito A110 (0,082 µm). Os compósitos Definite (0,110 µm) e Z250 (0,105 µm) não apresentaram diferenças estatísticas entre si nem aos demais compósitos avaliados. Nenhuma diferença estatística foi observada após o ensaio de escovação entre os compósitos Definite (0,178 µm), Z250 (0,187 µm), Admira (0,181 µm), e A110 (0,193 µm). Todos os compósitos apresentaram aumento estatisticamente significante da rugosidade superficial após o ensaio de escovação mecânica.
Reference Key
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Authors ;Leonardo Gonçalves Cunha;Roberta Caroline Bruschi Alonso;Paulo Henrique dos Santos;Mário Alexandre Coelho Sinhoreti
Journal journal of animal and plant sciences
Year 2003
DOI
10.1590/S1678-77572003000400014
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-77572003000400014
Keywords
resin composite surface roughnessdentistry rugosidade superficial

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