Scientific article
Open access

Effect of Multiple Enamel Surface Treatments on Micro-Shear Bond Strength

Published inPolymers, vol. 13, no. 20, 3589
Publication date2021-10-18
First online date2021-10-18

Objectives: The aim of this study was to evaluate the effect of different enamel surface treatments on the micro-shear bond strength. Materials and methods: Sixty-four approximal surfaces from freshly extracted molars were randomly assigned to eight groups, according to combinations of the following enamel surface treatments: ground or unground, 37.5% phosphoric acid etching time of 15 or 30 s, and with or without primer application. The same bonding agent (Optibond FL™ Adhesive, Kerr) was then used for all groups, and a 1.8 mm diameter resin composite (Harmonize™, Kerr) cylinder was built up on the bonded surface. Samples underwent a shear force test at a crosshead speed of 1 mm/min until failure. Bond strength was calculated, and failure modes were inspected under an optical microscope. Results: Bond-strength values ranged from 8.2 MPa for 15 s etched unground enamel with primer application to 19.6 MPa for 30 s etched ground enamel without primer application. ANOVA and Fisher's LSD post hoc tests revealed significant differences between the groups. Conclusions: Etching time and grinding have a statistically significant effect on the micro-shear bond strength of a three-step etch-and-rinse adhesive system on enamel. Primer application does not seem to be beneficial for enamel adhesion.

  • Adhesion
  • Bonding
  • Etching time
Citation (ISO format)
DAHER, René et al. Effect of Multiple Enamel Surface Treatments on Micro-Shear Bond Strength. In: Polymers, 2021, vol. 13, n° 20, p. 3589. doi: 10.3390/polym13203589
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Article (Published version)
ISSN of the journal2073-4360

Technical informations

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