Objective　To explore the effect of 3D printing periodontal bone defect model of anterior teeth combined with case-based learning (CBL) teaching mode in the standardized residency training of loose teeth fixation. Methods　Sixty general practitioner of stomatology students were equally divided into two groups

with one group receiving CBL teaching (CBL group) and the other group receiving 3D printing model combined CBL teaching (3D+CBL group). After the teaching

the teacher evaluated the overall practice effects

tested the residents' theory and practice scores

and designed a questionnaire to evaluate the teaching effect. SPSS 16.0 software was used for statistical analysis

and t test was used for comparison between the two groups. Results　The theoretical score (89.0±3.2) and the practical score (90.0±2.5) in the 3D+CBL group were significantly higher than the theoretical score (83.3±3.6) and the practical score (84.2±3.5) in the CBL group (P<0.05). The questionnaire showed that the students of the 3D+CBL group performed significantly better than those in CBL group in the following eight aspects

including mastery of basic periodontal knowledge

professional knowledge of loose teeth fixation

ability to diagnose cases and formulate treatment plans

clinical operation ability

interesting teaching content

willingness to communicate with teachers

awareness of actively receiving patients

and satisfaction of standardized residency training (P<0.05). Conclusion　The 3D printing periodontal bone defect model of anterior teeth combined with the CBL teaching mode has achieved good results in the teaching of loose teeth fixation

and it provides a reference for the application of 3D printing in clinical teaching for periodontology.