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Classification of dens invaginatus proposed by Oehlers et al. [24].
| Types | Description |
|---|---|
| Type I | Invagination is restricted to the crown up to the cementoenamel junction. |
| Type II | Invagination extends into the root beyond the cementoenamel junction. |
| Type IIIa | Invagination extends into the tooth with lateral communication to the periodontal ligament. |
| Type IIIb | Invagination extends into the tooth with apical communication to the periodontal ligament. |
