The Effect of Hydrogen Peroxide Colloidal-Ag Used in Dental Unit Waterline on Shear Bond Strength of Orthodontic Brackets

Abstract

Background: The quality of the water passing through the water lines is crucial to dental procedures. Studies on bracket adhesion of  hydrogen peroxide colloidal‑Ag, which is widely used to prevent biofilm formation, are limited in the literature.

Aim: To determine  whether disinfecting the dental units’ waterlines (DUW) with hydrogen peroxide colloidal‑Ag has any effect on the shear bond strength  (SBS) of orthodontic brackets bonded to enamel. 

Materials and Methods: Sixty premolar teeth were divided randomly into two groups.  The study and control groups consists of 30 teeth that were etched for 30 seconds with 37% phosphoric acid. Study groups washed with  hydrogen peroxide colloidal‑Ag water and the control group washed with municipal water. Transbond XT adhesive system was used to  bond stainless steel brackets on all the teeth. A 300‑g force was applied using a tension gauge to ensure a uniform adhesive thickness  and light cured with 6 seconds. The SBS was quantified by means of a universal testing machine. The residual adhesive on the enamel  surface was evaluated after debonding using the adhesive remnant index (ARI). 

Results: The t‑test results indicated that there were no  significant differences in the SBS. The comparison of the results of ARI scores was found statistically insignificant. 

Conclusion: It has been  found that hydrogen peroxide colloidal‑Ag, which is used to reduce the amount of biofilm in DUW, does not have a negative effect  on the adhesion of the brackets.