Fig. 1

Students’ responses to questionnaires on opinions about online classes. Responses are based on a 5-point Likert scale. The corresponding questions are as follows: Q1. Online classes were prepared and structured well; Q2. Online assessments and evaluations were efficient; Q3. Family’s reaction to online classes was positive; Q4. I was overall satisfied with online classes; Q5. In the current pandemic, a shift to online classes was a good option; Q6. I prefer online classes for the next semester; Q7. If safety guideline is assured, I would prefer conventional classes; Q8. Communication with professors was more convenient and effective in online classes; Q9. Communication with peers was more convenient and effective in online classes; Q10. Online classes helped me prepare better before the class; Q11. Online classes helped me review better after the class; Q12. Online classes stimulate and motivate self-directed learning; Q13. Online classes will create difficulties in the clinical aspects of dental learning in the future; Q14. Online classes will pose challenges in finishing dental school curriculum in the future; Q15. Online classes will create difficulties in preparing for the national board exam in the future; Q16. I am afraid that I will be a worse dentist than others who took conventional classes and clinical training