Shear Bond Strength Evaluation of Orthodontic Brackets Bonded to Fluorotic Teeth with a Self-Etching Primer and a New Generation of Color Bonding

Abstract

The objective of this work was to evaluate the shear bond strength (SBS) and bond failure site of brackets bonded to teeth with fluorosis treated with and without microabrasion before placement of a self-etching primer (SEP) and a color-changing composite and to compare with a control group. This in vitro study included 120 premolars with and without dental fluorosis, divided into six groups: (1) healthy enamel etched for 15 sec and fifth generation primer, (2) healthy enamel, (3) mild fluorosis (MIF) enamel, (4) MIF enamel microabraded, (5) moderate fluorosis (MOF) enamel, and (6) MOF enamel microabraded. For groups 2–6, an SEP was used. All samples were evaluated with the SBS test and the modified adhesive remnant index (ARI). The highest SBS mean value was for healthy enamel etched for 15 sec and fifth generation primer and the lowest SBS mean value was for healthy enamel with SEP. Significant differences were found in the ARI between healthy and MOF groups. SBS of orthodontic brackets bonded on fluorotic teeth with an SEP and a new generation of color bonding could be clinically acceptable as the value obtained was above the suggested minimum required for orthodontic bonding.

KEYWORDS:

• Fluorotic teeth
• Orthodontic brackets
• Shear bond strength

Notes

^a n = 20. SEP, self-etching primer; MIF, mild fluorosis; MOF, moderate fluorosis.

*Statistically significant difference (P < 0.05) with control group using ANOVA test.

^a n = 20. ARI, adhesive remnant index; SEP; self-etching primer; abr, microabrasion; MIF, mild fluorosis; MOF, moderate fluorosis. *Statistically significant difference (P < 0.05) with control group using χ².