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. 2021 Apr 7;91(5):597–603. doi: 10.2319/111820-943.1

Figure 2.

Figure 2.

Classification of root position relative to cortical plates. (A) Class I: the root is positioned against the labial cortical plate. (B) Class II: the root is centered in the alveolar housing without engaging either the labial or palatal cortical plate at the apical third of the root. (C) Class III: the root is positioned against the palatal cortical plate. (D) Class IV: at least two-thirds of the root is engaging both the labial and palatal cortical plates. (E) Class V: the root is positioned outside the labial cortical plate.