Adhesion promoters: effects on the bond strength of brackets.

Purpose: To evaluate the effect of two adhesion promoters on shear bond strength and remnant adhesive of brackets cemented with a light-cured orthodontic adhesive resin system.

Methods: The two adhesion promoters tested were OrthoSolo and All-Bond 2 Primer. Seventy-five upper premolars were divided into three groups of 25. A control group was established using Transbond-XT adhesive system and two experimental groups: Transbond-XT/OrthoSolo and Transbond-XT/All-Bond 2. Shear bond strength was measured using a universal testing machine and adhesive remnant was quantified using an image analysis equipment.

Results: The application of Orthosolo significantly increased bond strength for Transbond-XT adhesive system (P< 0.017). All-Bond 2 primer did not significantly increase the bond strength of Transbond-XT (P> 0.017). The Adhesive Remnant Index results and the analysis of the percentage of area of tooth occupied by adhesive indicated that adhesive remnant after debonding did not increase significantly (P> 0.05) with the use of either of the promoters.