Effect of adhesion boosters on indirect bracket bonding.

Area of Science:

• Dental Materials Science
• Orthodontic Materials Research
• Biomaterials Engineering

Background:

• Indirect bonding of orthodontic brackets is a common clinical procedure.
• Ensuring adequate bracket-to-enamel bond strength is crucial for successful orthodontic treatment.
• Adhesion boosters are used to enhance the bond strength of dental adhesives.

Purpose of the Study:

• To evaluate the effect of two adhesion boosters on the shear bond strength of indirectly bonded brackets.
• To assess the influence of these boosters on the location of bond failure.

Main Methods:

• Sixty bovine incisors were divided into three groups: control, Enhance Adhesion Booster, and Assure Universal Bonding Resin.
• Indirect bonding was performed using Sondhi adhesive after phosphoric acid etching.
• Shear bond strength was measured using a universal testing machine, and bond failure was assessed with the Adhesive Remnant Index (ARI).

Main Results:

• The Assure Universal Bonding Resin group exhibited significantly higher mean shear bond strength compared to the control and Enhance groups (P < .01).
• Significant differences in bond failure locations (ARI scores) were observed among the groups (P < .05).
• A moderate positive correlation was found between bond strength and ARI scores in the Assure group (r = 0.5860, P < .01).

Conclusions:

• All tested adhesion systems provided acceptable in vitro shear bond strength.
• The Assure Universal Bonding Resin significantly enhanced the shear bond strength of indirectly bonded brackets.
• Assure also increased the amount of residual adhesive on the enamel post-debonding, suggesting improved bond durability.