Scanning electron microscopy evaluation of the marginal gap in composite restorations with different adhesive techniques

Fábio Herrmann Coelho-de-Souza, Celso Afonso Klein-Júnior, Leonardo Maciel Campos, Michele Kleina, Elisabeth Pereira, Natália Fernandes Fischer


Purpose: This study used scanning electron microscopy (SEM) to evaluate the gap formation in composite restorations with four adhesive techniques: Prime & Bond 2.1 (Dentsply) without etching, Prime & Bond 2.1 with conventional etching, Prime & Bond 2.1 with 25% polyacrylic acid conditioning, and Clearfil SE Bond (Kuraray).
Methods: Five extracted sound human third molars were used. Four cavities were prepared in each tooth and restored with Z250 (3M/ESPE) composite resin, using each of the four adhesive techniques tested. Teeth were termocycled for 500 cycles and evaluated in SEM to measure gap formation in the gingival walls.
Results: No significant difference of marginal gap was found among the four experimental groups of adhesive techniques (ANOVA, P>0.05).
Conclusions: None of the tested adhesive techniques was able to avoid marginal gap formation; there was no difference among the adhesive techniques.
Key words: Composite resin; dentin-bonding agents; scanning electron microscopy


Composite resin; dentin-bonding agents; scanning electron microscopy

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e-ISSN: 1980-6523

ISSN-L: 0102-9460


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