Definition: The progressive loss of tooth structure from the outer surface of a tooth root.
Radiographic Features:
- Location: Most common at tooth apices, but can affect any portion of the root within bone
- Edge: Well-defined, smooth outline with altered tooth shape
- Shape: Often appears as blunted or linear apex instead of tapered
- Internal structure: Radiolucent area over the root structure
- Other: Pulp chamber/root canal outline remains visible when resorption overlaps these areas
- Number: May affect single or multiple teeth
Key points:
- Can be physiological (e.g., primary teeth) or pathological
- Various types: surface, inflammatory, replacement, cervical
- Often asymptomatic and discovered on routine radiographs
- May be associated with trauma, orthodontic treatment, or idiopathic causes
Clinical significance:
- Can lead to tooth loss if severe or progressive
- Treatment depends on extent, location, and etiology
- May require endodontic therapy, surgical intervention, or extraction
- Early detection crucial for preserving tooth structure and function
Note: Differentiation from internal resorption can be challenging, especially on facial/lingual surfaces. Use shift-shot technique or CBCT for accurate diagnosis. If the radiolucent area is continuous with the pulp space, internal resorption is more likely.