Avaliação ultramorfológica em microscopia eletrônica de transmissão e varredura da interface de união compósito-dentina produzida por diferentes cimentos resinosos convencionais e auto-adesivos
AUTOR(ES)
Carlos Eduardo Pena
DATA DE PUBLICAÇÃO
2009
RESUMO
The aim of this study was to evaluate the ultramorphology of the resindentin interfaces produced by different self-adhesive cements submitted to a nanoleakage protocol by means of Transmission (TEM) and Scanning Electron Microscopy (SEM), and to compare them with conventional resin cements. Materials and Methods: Six self-adhesive cements were used in the present study: RelyX Unicem (UN), RelyX U100 (UC), SmartCem 2 (SC), G-Cem (GC), Maxcem (MC), Set (SET); and two conventional resin cements: one that uses a 2-step etch-and-rinse adhesive (Rely X ARC - RX), and one that uses a 1-step self-etching adhesive (Panavia F - PF). An additional group included the use of a 2-step self-etching adhesive system (Clearfil SE Bond) prior to the application of Panavia F (PS). Thirtysix human molars were assigned to 9 groups according to the luting material. After 24h of water-storage, restored teeth were serially sectioned into 0.9 mm-thick slabs, which were submitted to a nanoleakage protocol with AgNO3 and observed in the TEM or SEM. Results: Different nanoleakage patterns were observed for the different groups. UC and UN self-adhesive resin cements presented little or no silver deposition, comparable to the conventional resin cements, while MC, SC and SET did not resist specimen preparation procedures. GC presented remarkable silver deposition along the interface. The additional group PS did not present differences from the original group PF. Conclusions: The characteristics of the resin-dentin interfaces were rather product-dependent than related to the type of resin cement.
ASSUNTO(S)
nanoinfiltração microscopia eletrônica de varredura cimentos resinosos microscopia eletrônica de transmissão resin cements sem nanoleakage tem cimentos auto-adesivos odontologia self-adhesive cements
ACESSO AO ARTIGO
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