| Abstract
Background. Acid etching and bonding is a routine process in orthodontic treatment. The
present study aimed to evaluate enamel discoloration after using different types of acid etching
and adhesive agents.
Methods. A total of 105 extracted human premolars were divided into six groups regarding
the type of acid etching agent: solution and gel of 37% phosphoric acid, and type of selfcured
adhesive agent: Unite (3M, fluoride-free), Resilience (Ortho Technology), and Rely-a-
Bond (Reliance, fluoride-releasing adhesive), with each group containing 15 specimens. All
the selected teeth were subjected to a staining process, and color parameters were determined
using a spectrophotometer.
Results. The type of phosphoric acid (solution or gel) had no significant effect on the color
change of enamel (P > 0.05). Resilience significantly changed the enamel color compared to the
Unite and Rely-a-Bond (P < 0.001). There was no significant difference in color change between
the Unite and Rely-a-Bond adhesives (P = 0.67). The difference in color change between all the
three time intervals (T0-T1, T1-T2, and T0-T2) was significant (P < 0.001).
Conclusion. In this study, the type of phosphoric acid (solution or gel) did not result in any
significant difference in enamel color. Also, considering the lack of the effect of the orthodontic
adhesive type in terms of fluoride release or no fluoride release, it can be concluded that this is
most affected by the commercial brand of adhesives. |