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Progress in Orthodontics
Fig. 2 | Progress in Orthodontics

Fig. 2

From: Factors influencing root resorption in retained mandibular second deciduous molars with congenital absence of second premolars: a cross-sectional study

Fig. 2

Definition of groups for the retained mandibular second deciduous molar. Group indicators are set according to the amount of root resorption. Teeth with over 3/4 root resorption were classified into the poor condition (PC) group, while those with less than 2/4 root resorption were classified into the good condition (GC) group

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