Present status and future directions: Apexification

Figure 2 Wein’s classification. A: No root or bone resorption is evident, and the preparation is terminated at 1.0 mm from the apical foramen; B: Bone resorption is apparent but no root resorption, and the preparation is terminated at 1.5 mm from the apical foramen; C: Both root and bone resorption are apparent, and the preparation is terminated at 2.0 mm from the apical foramen.