Table 2.

Root resorption conditioned by orthodontic force. ⁸¹

Degree of root resorption	Root layers included in resorption process	Description
1	Cement or superficial resorption with further remodeling.	Here only outer layers of cement are resorbed with further regeneration or remodeling.
2	Dentin resorption with further restoration.	Outer layers of cement and dentin are resorbed and mostly reconstructed by cementoid substance. The shape of the root after such resorption can be similar or different from the original shape.
3	Apex circumferential resorption.	Here, the hard tissues of the root apex are entirely resorbed, and the root radiographically appears to be shortened. No regeneration is observed.