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Orthodontics is the presumed beneficiary of a variety of new technologies and protocols intended to hasten tooth movement, improve outcomes and streamline treatment. Some are supported by data, some are not. The 2010 Moyers Symposium focused on the biology and biomechanics of tooth movement, with emphasis on effectiveness and efficiency. There has been a need to separate the wheat from the chaff, the essence of evidence-based dentistry. The claims of supporters-ardent and otherwise-were examined via evidence-based studies that have looked at such techniques du jour as corticotomies, self-ligating bracket systems, temporary anchorage devices and proposed pharmacological adjuncts. In addition, canine impaction and primary failure of eruption were discussed. The genetic basis of such clinical problems as root resorption also was considered.
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