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Progress in Orthodontics
Fig. 1 | Progress in Orthodontics

Fig. 1

From: Treatment of impacted or retained second molars with the miniscrew-supported pole technique: a prospective follow-up study

Fig. 1

Selection of the pole length depending on the included molar inclination: a mesial. b vertical. c distal. Force delivered to the pole arm and moment acting on the impacted/retained molar (pink). Fr (blue), reciprocal force; Frv, vertical/extrusive component of Fr; Frh, horizontal component of Fr. Fa (orange), activation force; Fav, vertical/extrusive component of Fa; Fah, horizontal component of Fa

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