Maria Francesca Sfondrinia; Esmeralda Xhekab; Andrea Scribantec; Paola Gandinid; Giuseppe Sfondrinie
Objective: To test the null hypothesis that there is no significant difference in the shear bond
strength (SBS) and Adhesive Remnant Index (ARI) scores of new vs reconditioned self-ligating
brackets. Materials and Methods: One hundred and twenty permanent extracted bovine teeth were
embedded in resin blocks. Three different new and reconditioned self-ligating orthodontic brackets
(Smart Clip [3M Unitek]; Quick [Forestadent]; and Damon3MX [Ormco]) were tested. Scanning
electron microphotographs of the different new (groups 1, 3, and 5) and reconditioned (groups 2, 4,
and 6) bracket bases were taken before starting the experiments. Brackets were then bonded to
the teeth using an orthodontic adhesive and were then tested in shear mode using an Instron
Universal Testing Machine. ARI scores were then recorded. Statistical analysis was performed to
determine significant differences in SBS and ARI Scores. Results: Smart Clip and Damon3MX reconditioned brackets showed significantly lower SBS than did new ones. On the contrary, Quick reconditioned brackets showed significantly higher SBS than did new ones. No significant differences in ARI scores were found after the reconditioning process for the three different brackets tested. Conclusion: The in-office reconditioning procedure alters the SBS of self-ligating brackets,
although SBS values still remain clinically acceptable.
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