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Evaluation of chemical and/or mechanical treatments of the smear layer as revealed by scanning electron microscopy - a blind comparative study

A blind comparative study of chemical and/or mechanical treatments of the smear layer, according to scanning electron microscopy images, was carried out. The effect of the treatments was analyzed on the smear layer of mesio-occlusodistal cavity walls prepared in vitro in human third molars. The agen...

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Published in:Pesquisa odontológica brasileira 2000-06, Vol.14 (2), p.101-106
Main Authors: LUZ, Maria Aparecida Alves de Cerqueira, GARONE NETTO, Narciso, ARANA-CHAVEZ, Victor E., SOBRAL, Maria Angela Pitta, SINGER, Júlio da Motta
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description A blind comparative study of chemical and/or mechanical treatments of the smear layer, according to scanning electron microscopy images, was carried out. The effect of the treatments was analyzed on the smear layer of mesio-occlusodistal cavity walls prepared in vitro in human third molars. The agents used were air/water spray, 37% phosphoric acid, 5% tannic acid, biologic detergent, 0.5% sodium hypochlorite, and enamel hatchet alone or in association with the previous agents. Electron micrographs were evaluated by three professionals according to the degree of visualization of underlying dentin or enamel. Phosphoric acid received the highest scores due to the complete removal of the smear layer. However, statistical analyses revealed diverse performances of non or slightly demineralizing agents, according to the cavity walls in dentin, while there was equivalent effect on the enamel of gingival walls. Um estudo comparativo cego de tratamentos químicos e/ou mecânicos da camada de esfregaço, de acordo com imagens da microscopia eletrônica de varredura, foi realizado. Analisou-se o efeito dos tratamentos sobre a camada de esfregaço de paredes de cavidades mésio-ocluso-distais, preparadas in vitro, em terceiros molares humanos. Os agentes empregados foram spray ar/água, ácido fosfórico a 37%, ácido tânico a 5%, detergente biológico, hipoclorito de sódio a 0,5% e machado para esmalte isoladamente ou associado a estas substâncias. Eletromicrografias foram avaliadas por três profissionais de acordo com o grau de visualização da dentina ou esmalte subjacentes. O ácido fosfórico recebeu as maiores graduações devido à remoção completa da camada de esfregaço. Análises estatísticas revelaram performances diversas entre tratamentos não/ou levemente desmineralizantes de acordo com as paredes cavitárias, em dentina e efeitos equivalentes entre si, em paredes de esmalte.
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title Evaluation of chemical and/or mechanical treatments of the smear layer as revealed by scanning electron microscopy - a blind comparative study
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