Influência do tempo de armazenamento sobre o selamento de restaurações de amálgama utilizando diferentes forradores
Influence of storage time on sealing of amalgam restorations using different liners
Moraes, R.R.; Lima, F.G.; Bueno, M.; Demarco, F.F.
Rev. odontol. UNESP, vol.34, n3, p.135-140, 2005
Resumo
O objetivo deste estudo foi avaliar, pela análise da microinfiltração, a influência do tempo de armazenamento sobre o selamento de restaurações de amálgama com diferentes materiais forradores. Cavidades Classe V padronizadas, com margens em dentina/cemento, foram confeccionadas nas raízes de 80 incisivos bovinos. Todos os materiais foram aplicados seguindo as recomendações dos fabricantes, formando 4 grupos (n = 20): G1 – controle (sem forrador); G2 – verniz Copalite (Cooley & Cooley) com secagem por 5 segundos; G3 – verniz Copalite com secagem por 30 segundos; e G4 – sistema adesivo Single Bond (3M ESPE). As cavidades foram restauradas com a liga Dispersalloy (Dentsply Caulk) e, após 24 horas, realizou-se o acabamento e o polimento, sendo as amostras armazenadas em soro fisiológico, a 37°C. Após 7 dias, 10 espécimes de cada grupo foram aleatoriamente selecionados, submetidos a termociclagem e imersos em solução de fucsina básica a 0,5%. Os espécimes foram então longitudinalmente seccionados, e a penetração do corante avaliada sob magnificância (40x), com escores padronizados (0-2). Procedimentos semelhantes foram realizados com os espécimes restantes após 15 meses de armazenagem. Os dados foram submetidos ao teste estatístico de Kruskal-Wallis (α = 0,01). Na primeira avaliação, as restaurações forradas com o adesivo Single Bond (G4) apresentaram escores de infiltração significativamente menores em relação aos dos demais grupos (p < 0,001). Após 15 meses de armazenamento, nenhum dos grupos testados apresentou melhoria na capacidade de vedamento, enquanto o G4 demonstrou aumento significativo dos escores de penetração do corante (p < 0,001)
Palavras-chave
Amálgama de prata, infiltração dentária, verniz cavitário, adesivos dentinários.
Abstract
The aim of this study was to evaluate, by microleakage means, the storage time effect on sealing of amalgam restorations lined with different materials. Standard Class V cavities, with margins placed in dentin/cementum, were made in 80 bovine incisors roots. All materials were applied following manufactures’ instructions, defining 4 groups (n = 20): G1 – control (unlined restorations); G2 – 5 s air-dried Copalite liner (Cooley & Cooley Ltd.); G3 – 30 s air-dried Copalite liner; and G4 – Single Bond adhesive system (3M ESPE). Cavities were filled (Dispersalloy, Dentsply Caulk) and finishing and polishing performed after 24 hours. Specimens were stored in sodium azide solution at 37°C. After 7 days, 10 samples per group were randomly selected, thermal cycled and immersed in 0.5% basic fuchsin solution. Specimens were then cross sectioned and dye penetration evaluated under magnification (40x), with standard scores (0-2). Similar procedures were performed with the remaining samples, after 15 months of storage. Data were submitted to Kruskal-Wallis test (α = 0.01). In the first evaluation, restorations lined with Single Bond (G4) presented significantly lower leakage scores between all groups (p < 0.001). After the 15-month storage period, none of the tested groups presented significant improvement in the sealing ability, while G4 showed a significant increase in the dye leakage scores (p < 0.001).
Keywords
Dental amalgam, dental leakage, dental cavity lining, dentin-bonding agents
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