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Fig. 2 | Progress in Orthodontics

Fig. 2

From: External root resorption with the self-ligating Damon system—a retrospective study

Fig. 2

Ranking levels of the external apical root resorption by Levander and Malmgren [10]. Grade 0: absence of root resorption; grade 1: mild resorption, root with its normal length, and only an irregular contour; grade 2: moderate resorption, small area of root loss with the apex exhibiting an almost straight contour; grade 3: accentuated resorption, loss of almost one third of root length; and grade 4: extreme resorption, loss of more than one third of the root length

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