关键词: 本科教育, 口腔医学, 龈上洁治, 短视频交互式教学, 教学改革

Abstract: Objective    To evaluate the effect of interactive short-video teaching in the preclinical training of periodontology supragingival scaling teaching for dental undergraduate students. Methods    A total of 81 undergraduate students（Class of 2020）from the School of Stomatology，Peking University were enrolled. According to the principle of randomization，students were randomly assigned in advance by the Education Office to a study group（n = 40）and a control group（n = 41）. The study group received instructor demonstration combined with an interactive short-video teaching model，whereas the control group received traditional instructor demonstration alone. After the course，students′ manual supragingival scaling performance was assessed using a standardized examination comprising 10 items：posture，instrument selection，instrument grip，fulcrum，instrument placement position，instrument placement angle，force application method，force application direction，calculus removal，and gingival condition. After scoring，the control group also received the short-video instruction. A questionnaire survey was conducted in both groups to assess students′ perceptions of the content and effectiveness of the interactive short-video teaching. Results    The total score in the study group（92.9 ± 2.2）was higher than that in the control group（91.4 ± 3.0），with a statistically significant difference（t = 2.522，P = 0.014）. Among the 10 assessment items，the study group scored higher for instrument grip［9.0（9.0，10.0）］than the control group［9.0，（8.0，9.5）］，and the difference was statistically significant（Z = 2.389，P = 0.017）；no statistically significant differences were observed for the remaining items between the two groups（all P > 0.05）. The proportion of students with a total score ≥ 95 was higher in the study group（22.5%）than in the control group（9.8%），and the proportion with a total score < 90 was lower in the study group（7.5%）than in the control group（26.8%）. A significant difference was found in the distribution across score categories between the two groups（χ² = 6.333，P = 0.042）. A total of 81 questionnaires were distributed，and 80 valid questionnaires were collected，with a questionnaire collection rate of 98.8%. The questionnaire survey showed that all students expressed interest in the video content；93.8%（75/80）considered the video length appropriate and reported active participation during teaching. Regarding competency improvement，98.8%（79/80）believed that short videos helped enhance operational skills. In terms of procedural difficulty by tooth position，82.5%（66/80）reported the maxillary posterior teeth as the most difficult；48.8%（39/80）considered the short videos most helpful for operations on the maxillary posterior teeth. Conclusion    Interactive short-video teaching combined with traditional instructor demonstration can significantly improve the teaching effectiveness of supragingival scaling in the preclinical periodontal training；its broader applicability warrants further verification in teaching practice.

Key words: undergraduate education, stomatology, supragingival scaling, interactive short-video teaching, teaching reform