探讨数字化口腔虚拟教学评估系统在前牙全瓷冠牙体预备评分中的应用及可靠性。

2018年参加第二届"华南杯"口腔医学生临床技能邀请赛的21名选手和2019年参加第三届"光华杯"口腔医学生临床技能展示活动的24名选手，使用数字化口腔虚拟教学评估系统的考试模式进行左上中切牙全瓷冠牙体预备。分别采用评委评分和机器评分两种方式对牙体预备结果进行评分，记录评委所用评分时间，采用SPSS 26.0软件对评委评分与机器评分的结果进行相关性分析。

2018年和2019年两种评分方式评分结果均相关（r₂₀₁₈ = 0.567，P₂₀₁₈ = 0.007；r₂₀₁₉ = 0.546，P₂₀₁₉ = 0.006）；机器评分在牙体预备结束时即刻获得，评委用于每个学生的平均评分时间分别为2.31和1.88 min。

数字化口腔虚拟教学评估系统可应用于固定义齿修复牙体预备教学，可对牙体预备结果进行即刻评分，机器评分与评委评分成正相关性，两者各有优缺点，在牙体预备实验教学中应注意取长补短。

To make a preliminary evaluation of the application of digital virtual teaching system in tooth preparation for an all-ceramic crown of an anterior tooth.

Forty-five students, who participated in 2018 and 2019 Clinical Skills Exhibition Activities for Stomatology Students (21 in 2018 exhibition activities named 2nd "South China Cup" and 24 in 2019 named 3rd "Guanghua Cup" ) , performed tooth preparation for an all-ceramic crown on a plastic tooth of left upper central incisor (#21) by using the test mode of the digital virtual teaching system. The scores of tooth preparation were assessed by two professional judges and the system, respectively, which was then analyzed by the Pearson Correlation (SPSS 26.0) . Moreover, the assessment time required by the judges was also recorded.

The correlation coefficients of the scores by the two assessment methods in 2018 and 2019 were 0.567 (P = 0.007) and 0.544 (P = 0.006) , respectively. The scores assessed by the digital virtual teaching system were obtained at the end of tooth preparation, while the professional judges required a mean of 2.31 minutes in 2018 and 1.88 minutes in 2019 for evaluation.

The digital virtual teaching system can be applied in the tooth-preparation training for undergraduates, and give a real-time assessment. The scores were positively correlated with the judges′. Both of the two assessment methods have their own advantages and disadvantages, so that a combination of the two might be more effective in teaching.