Abstract
ABSTRACTObjective: The aim of this study was to compare the effects of three enamel etching modes - laser-etch, self-etch and acid-etch (5, 10 and 15 s) - on bracket bonding, using a universal adhesive. Methods: Eighty-four maxillary premolars were randomly divided into seven groups (n=12) based on the etching method and the adhesive used for bracket bonding. After water storage and thermocycling, shear bond strength was measured, and adhesive remnant index scores on debonded enamel were determined. Results: There were significant differences between the seven groups regarding bond strength values (p< 0.001). The highest values were observed in universal adhesive with laser etching group, while Transbond XT with acid or laser etching, and universal adhesive used in self-etch mode demonstrated the lowest bond strength. The universal adhesive with the three different etching times presented with statistically similar results, all showing an improvement in bond strength, compared with Scotchbond universal (SBU)/SE. Conclusions: The universal adhesive evaluated in the present study demonstrated statistically similar bond strengths to conventional orthodontic adhesive in self-etch mode. The bond strength can be improved by adding an initial acid etching or laser conditioning step, although enamel damage was observed in some cases.
Highlights
For many years phosphoric acid etching has been widely used as the main step of bonding orthodontic brackets
The highest bond strength was achieved in the laser/Scotchbond Universal (SBU) group (15.4 ± 3.8), with significant differences from all the other groups (p < 0.006)
The lowest strength was obtained in conventional etch/TXT, laser/TXT and SE/SBU groups, with no significant differences between them
Summary
For many years phosphoric acid etching has been widely used as the main step of bonding orthodontic brackets. The differential dissolution of enamel crystals and the resultant roughened surface is known to be responsible for successful micromechanical bonding to enamel.[1] this approach takes a long time, especially in the initial set up session, which is associated with patient discomfort. Acid etching creates a morphologically porous layer 5-50 μm deep, which could render the teeth susceptible to staining.[2,3] increased decalcification and white spot formation around bonded brackets during orthodontic treatment have been reported as possible disadvantages of the conventional bonding technique.[2,4,5] Enamel damage might occur during bracket removal and elimination of the high bulk of residual adhesive resin.[6] These shortcomings interfere with the primary goal of the treatment in improving esthetics and appearance of the teeth, leading to research efforts in order to find suitable alternatives
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
