As shown in Table 2, exploratory factor analysis identified three factors. Five questions (“Did you understand the technique for border molding on the labial side?”; “Did you understand the anatomic locations?”; “Are important matters adequately emphasized?”; “Did you understand the technical steps?”; and “Were you motivated for clinical training?”) were excluded from analysis because of insufficient factor loading. The Kaiser-Meyer-Olkin measure was 0.846, and Bartlett’s test of sphericity showed a significant difference between variables (p < 0.001). These results validated the application of exploratory factor analysis. In addition, the validity of the three factors was confirmed by the Kaiser-Guttman rule and the scree plot criteria.Table 2Results of exploratory factor analysis with each item divided into three factorsFactorItems1235.Did you understand the method for border molding at the buccal side?.957.029−.0877.Did you understand the method for border molding at the lingual side?.953−.095.0104.Did you understand the method for border molding at the retromolar pad?.821.077−.0533.Did you understand how to adjust the custom trays?.649.113−.0399.Did you understand the mobility of mucosa?.643−.292.1341.Did you understand how to use the impression material?.588.061−.0808.Did you understand the image of the denture shapes?.449.058.2312.Did you understand how to use the alcohol torch?.446.129.11719.Is practical training well organized?−.113.794−.05213.Did you understand the instructions of the teacher?.083.738−.09421.Do you value practical training overall?.161.645.04620.Is practical training easily comprehensible?−.004.606.10612.Was the level of practical training appropriate for students?−.059.538.14015.Did you find proper literature and references?.061−.081.84014.Did you prepare for or review practical training?−.027.032.78516.Are you satisfied with what you have learned?−.046.168.652Interfactor correlation 1–.339.459 2–.449 3–Percent of variance explained33.30913.6696.813Cronbach’s alpha.893.800.818Mean3.7004.3903.380SD.991.7481.040 SD standard deviation