Residents' journal review

Many variables have been studied with respect to resistance to sliding (RS) in orthodontics. Sliding velocity (SV) is 1 element that has not received much consideration, even though it has a definitive influence on RS. The purpose of this study was to investigate the effect of SV on RS in a self-ligating bracket using an in-vitro model. A stainless steel self-ligating bracket with a nickel-titanium clip (Empower; American Orthodontics) was fixed to a custom model. The bracket was bonded to ensure that second- and third-order resistance values were negligible and only RS was tested.

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