The authors carry out an examination of the principles that lead the "passive" anchorage of the teeth. Furthermore it's considered the possibility to have an different anchorage between two teeth or arch segment with force systems developing different Moment/Force ratio between active and reactive segment. At last, they consider advantages and disadvantages of these systems.
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Effects of canine movement on maxillary anterior en-masse retraction with clear aligners: a finite element study.
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