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Types of apical response (Chen and Chen) [4]
| Types | Radiographic Picture |
|---|---|
| Type 1 | Increased thickening of the canal walls and continued root maturation |
| Type 2 | No significant continuation of root development with root apex becoming blunt and closed |
| Type 3 | Continued root development with the apical foramen remaining open |
| Type 4 | Severe calcification (Obliteration) of the canal space |
| Type 5 | A hard tissue barrier formed in the canal between the coronal MTA plug and the root apex |
