**3. Results**

## *3.1. Clinical Information*

The left MIM (ID 26 and 36) had a severe dentoalveolar abscess with a fistula and was extracted with abundant granulation tissue. The right MIM (ID 16 and 46) showed relatively less granulation tissue. The MIM had short, twisted, and fused abnormal roots (Figure 3). ID 26 and 46 were fractured during the extraction. The fractured surfaces were roughly calcified and there was a small hole connecting the pulp chamber and the root canal. The coronal pulp chamber and root canal were opened after extraction and necrotized, liquefied, gray, and slurried pulp and infected dentin were revealed. The incisors affected by the MIM (ID 11) and the non-MIM teeth (ID Nor) were clinically sound.
