The effect of archwire vibrations on the stick-slip behavior of the bracket-archwire interface utilizing clinically relevant tipping moments
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Abstract
This study evaluated bracket-archwire frictional resistance as a function of ligation method and archwire vibration. In vivo archwire vibrations were measured to obtain frequencies and amplitudes for ex vivo testing. Active and passive ligation methods were compared for 9 vibration scenarios utilizing a friction testing apparatus, where a nickel titanium spring was attached to a wire bonded to an upper right canine bracket to create a 1500 cN-mm moment. As retraction forces were applied, the amount of time (ln, s) for each bracket configuration to move along a stainless steel wire was recorded in 90 trials. Results indicated that trials containing medium (150mV) and high (190mV) amplitude vibrations had significantly less friction, 4.81±2.08 and 4.67±2.00, respectively, than those subjected to low (110mV) amplitudes, 5.80±1.39 (p=0.04). There were no significant differences between passive and active ligation methods (p=0.100) and frequency of vibrations (p=0.317) on bracket-archwire frictional resistance.
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Introduction -- Materials and methods -- Results -- Discussion -- Conclusion -- Literature cited -- Appendix A
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M.S.