In vitro shearing force testing of two seventh generation self-etching primers

Area of Science:

• Orthodontics
• Dental Materials Science
• Biomaterials

Background:

• Orthodontic bracket debonding is a clinical concern.
• Self-etching primers (SEPs) offer a simplified bonding procedure.
• Evaluating the shear bond strength of new SEPs is crucial for clinical application.

Purpose of the Study:

• To compare the in vitro shear bond strength of iBOND and G-Bond self-etching primers.
• To assess the performance of these SEPs against conventional bonding agents.

Main Methods:

• Human molars were bonded with stainless steel buttons using Transbond XT composite and four bonding agents: iBOND, G-Bond, Transbond Plus SEP, and Transbond XT primer.
• Shear bond strength was tested immediately, at 24 hours, and 3 months.
• Adhesive Remnant Index (ARI) was evaluated.

Main Results:

• Transbond XT primer showed higher immediate debonding force than Transbond Plus SEP, iBOND, and G-Bond.
• Debonding forces for Transbond XT primer and Transbond Plus SEP increased significantly after 24 hours.
• At 3 months, all bonding agents exhibited comparable debonding forces.
• Significant differences in ARI scores were observed across groups at all time points.

Conclusions:

• iBOND and G-Bond provide adequate shear bond strength for orthodontic attachments.
• These SEPs can withstand initial alignment and leveling forces from light archwires.
• Their performance supports potential use during early orthodontic treatment stages.