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Progress in Orthodontics
Fig. 2 | Progress in Orthodontics

Fig. 2

From: External root resorption (ERR) and rapid maxillary expansion (RME) at post-retention stage: a comparison between tooth-borne and bone-borne RME

Fig. 2

Assessment of root length. Mesiobuccal root assessed as the linear distance between the tip of the mesiobuccal cusp (MB) and the apex of the mesiobuccal root; distobuccal root assessed as the linear distance between the tip of the distobuccal cusp (DB) and the apex of the distobuccal root; and palatal root assessed as the linear distance between the tip of the mesiolingual cusp (ML) and the palatal root apex

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