Resumo

BRAMANTE, Clovis M et al. Effect of sputter-coating on cracking of root-end surfaces after ultrasonic retrograde preparation: A SEM study of resected root apices and their respective impressions. Acta odontol. latinoam. [online]. 2010, vol.23, n.1, pp.53-57. ISSN 1852-4834.

The aim of this study was to evaluate in vitro the effect of sputter- coating for SEM analysis on the formation of cracks on root-end surfaces after retrograde cavity preparation with ultrasonic tips. Root-end cavities were prepared with either Satelec S12/90oD diamond-coated or S12/90o non-coated stainless steel retrotips. Impressions were taken before and after retrograde cavity preparation. The resected root apices and their respective impressions were examined using a scanning electron microscope, and the presence, extension and numbers of cracks were recorded after each procedure. The number of cracks observed directly on the ultrasonically prepared root-end surfaces was larger than that observed in their respective impressions taken after root-end cavity preparation, which suggests that cracking was mostly produced by the sputtercoating process required for SEM analysis. Impressions of the root-end cavities prepared with non-coated ultrasonic stainless steel retrotips showed a greater incidence of cracks (3/10 impressions) than those that replicated cavities prepared with diamond-coated retrotips (1/10 impressions). No statistical difference was found between the diamond and stainless steel retrotips.

Palavras-chave : Ultrasonic; Root canal therapy; Tooth apex; Microscopy.

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