Effect of Multiple Enamel Surface Treatments on Micro-Shear Bond Strength.
Polymers (Basel)
; 13(20)2021 Oct 18.
Article
en En
| MEDLINE
| ID: mdl-34685348
ABSTRACT
Objectives:
The aim of this study was to evaluate the effect of different enamel surface treatments on the micro-shear bond strength. Materials andmethods:
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.
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Idioma:
En
Revista:
Polymers (Basel)
Año:
2021
Tipo del documento:
Article
País de afiliación:
Suiza