[Evaluation on application of 3D printing digital positioning guide in root canal retreatment].

Purpose: To explore the application of 3D printing digital positioning guide in root canal retreatment.

Methods: Eighty-two isolated teeth collected in Chifeng College Affiliated Hospital from January 2018 to December 2021 were selected, and divided into experimental group and control group by random number table method, with 41 teeth in each group. Both groups were given root canal retreatment.