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Fig. 1. Functional appliances used in the present study. A and B, Z-activator (Teuscher activator with a high-pull headgear)10. C, E-activator (modified Andresen activator, also known as an Ergenzinger activator).11
Korean J Orthod 2020;50:170~180 https://doi.org/10.4041/kjod.2020.50.3.170
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