Root resorption is the loss of dentin, cementum, and bone from a tooth and can be initiated internally within the pulp space or externally on the surface of the tooth. It is usually irreversible except for minor transient resorption. Treatment can arrest or slow the process but may ultimately require tooth extraction if not addressed. Root resorption occurs through two phases - injury to the non-mineralized tooth tissues followed by stimulation of resorption. There are different types classified by location and cause to aid in diagnosis and treatment.

1. Root resorption

2. Introduction:
• Root resorption is a condition associated with either a
physiologic or a pathologic process resulting in a loss of
dentin, cementum and/or bone
• It may be initiated in the periodontium and affect initially the
external surfaces of the tooth (external resorption) or it may
start within the pulp space affecting primarily the internal
dentin surfaces (internal resorption).

3. • With the exception of minor, transient surface resorption, loss
of tooth structure is irreversible.
• Treatment, when successful, can only arrest the process and
when less successful, slow down resorption.
• If not diagnosed and treated, that can lead to tooth
extraction.

5. • The etiology of root resorption requires two phases: Injury
and Stimulation
• The injury is similar to several types of root resorption
• Injury is related to the non-mineralized tissues covering the
external surface of the root, the precementum, or internal
surface of the root canal, the predentin.

6. Types:
• Internal resorption :
o Infection related
o replacement
• External resorption :
o Surface
o Inflammatory
o Replacement resorption
o Spontaneous ankylotic
o Multiple sites of ankylotic or infected
• Cervical Invasive resorption

8. • A clinical-related classification of root resorption that will
assist in diagnosis and treatment of the pathological process.
• Pulpal infection root resorption
• Periodontal infection root resorption
• Orthodontic pressure root resorption
• Impacted tooth or tumor pressure root resorption
• Ankylotic root resorption