至36～48个月，牙髓组织逐渐出现退行性变，例如纤维性变和牙髓钙化等。

Then, at 36~48 months after treatment, degenerative changes, such as fibrous degeneration and calcification, gradually occurred in the remaining pulps.

youdao

至36～48个月，牙髓组织逐渐出现退行性变，例如纤维性变和牙髓钙化等。

Then, at 36~48 months after treatment, degenerative changes, such as fibrous degeneration and calcification, gradually occurred in the remaining pulps.

youdao