Influência da contaminação do campo operatório na resistência de união à dentina / Influence of the contamination of the operatory Field at dentin bonding strength

AUTOR(ES)
DATA DE PUBLICAÇÃO

2010

RESUMO

Studies on contamination are difficult to compare due to the variety of experimental designs as the type of substrate, the time when contamination takes place during the adhesive procedure and how this contamination is treated in order to clean the operatory field. Thus, further studies are needed to investigate more thoroughly the conditions described in the literature and obtain a protocol to deal with contamination. This study aimed to observe, by scanning electron microscopy (SEM), the interface of adhesive restorations performed with a two-stepself-etching adhesive system (Clearfill SE Bond - Kuraray), contaminated with blood at two different times, receiving two different treatment to the contamination . Therefore, 15 selected human molars were divided into five experimental groups (n = 3): G1 - control (no contamination), G2 - contamination before primer, and rinsing and drying treatment, G3 - contamination before priming treatment, thendrying; G4 - contamination after light curing bond, rinsing and drying treatment; G5 - after light curing bond and drying. The teeth were then seccioned in order to obtain a flat dentin surface. This surface was regularized with SiC sandpaper and a standardized smear layer was obtained with SiC sandpaper # 600 for 1 min. The specimens were subsequently contaminated, according to the experimental groups, with blood obtained from a single donor - the author stored inVacuette ® tubes with sodicheparin and used within 7 days. They were restored with a layer of flowable composite (Filtek Z-350 Flow - 3M-ESPE) and two layers of microhybridresin (Filtek Z-350 - 3M-ESPE). After construction, the specimenswere divided in two, exposing the center of restorationand passed through preparation for SEM analysis. The results were described in two ways: Morphological Analysis where changes were observed in hybrid layer (HL) formation of groups in the presence of the contaminant, and Morphometric Analysis, which was analyzed statistically andaassociation between presence of the contaminant and a decreasing size of tags was found when compared to the control group (p 0.05). Additionally, it was observed that treatment of washing with water was not sufficient to restore the formation of hybrid layer similar to that observed in the control group.

ASSUNTO(S)

sangue dentina contamination of the operatory field blood adesivo autocondicionante scanning electron microscopy contaminação do campo operatório dentin microscopiaeletrônica de varredura self-etch adhesive system

ACESSO AO ARTIGO

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