American Journal of Orthodontics and Dentofacial Orthopedics
Original articleShear bond strength of orthodontic brackets bonded with a modified 1-step etchant-and-primer technique☆
Section snippets
Material and methods
A total of 108 recently extracted third molars with no cracks, hypoplastic areas, or visible caries were collected for the study. The roots of the teeth were embedded in autopolymerizing orthodontic resin (Dentsply International, York, Pa) with the anatomic crowns exposed and stored in 0.5% chloramine-T. The specimens were placed in an artificial saliva solution (Roxane Laboratories, Columbus, Ohio) maintained at 37°C for a week before the orthodontic bonding procedure. The teeth were polished
Results
Results are summarized in the Table. One-way ANOVA detected a significant difference between groups (P < .001). Student t tests identified which groups were different. Group 3 specimens (self-etching primer system with the air dispersion step omitted) were found to have significantly less mean shear bond strength than the other 2 groups (P < .001). There was no evidence to suggest a difference in mean shear bond strength between groups 1 and 2 (P = .34).
Discussion
Etching tooth enamel with phosphoric acid creates surface microporosities and irregularities into which low-viscosity resins can readily flow. This formation of mechanical retention by cured resin on phosphoric acid-etched enamel has been the major factor responsible for the enamel adhesion of resin-based composite.14
Self-etching primers are relatively recent innovations that simultaneously act as etchant and primer. Self-etching primers are not rinsed off the surface of the teeth. Instead, all
Conclusions
Under the conditions of this study, there was no difference in the shear bond strength of orthodontic brackets bonded to teeth with a self-etching primer or a conventional, multistep bonding procedure. However, a significant decrease in shear bond strength was discovered when the self-etching primer solution was not air-thinned according to the manufacturer's directions. The omission of this step resulted in statistically lower shear bond strengths than in the other 2 groups.
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