研究数字化模型分析和头影测量技术对口腔正畸学实验教学的影响。

选取中山大学光华口腔医学院2013级口腔临床医学专业本科学生共20人为研究对象，随机数字表法分为两组，一组同时进行传统模型和数字化模型分析教学，另一组同时进行传统头影测量分析和数字化头影测量分析教学。分别比较传统和数字化教学对学生掌握模型分析和头影测量方法的影响，以及对其测量准确度的影响。采用问卷的形式，调查学生对传统和数字化教学方法的评分，以及对数字化方法的评价。

与教师的基准值相比，数字化方法中模型分析的拥挤度、Bolton指数、头影测量的SNA和MP-FH测量差值分别为（0.4 ± 0.7）mm、（0.7 ± 0.8）%、（3.1 ± 1.3）°和（4.7 ± 0.4）°，而传统方法中这4项的测量差值分别为（1.8 ± 0.9）mm、（5.6 ± 3.0）%、（5.2 ± 0.8）°和（7.5 ± 1.3）°，且数字化方法测量差值低于传统方法，差异有统计学意义（P<0.05）；学生对数字化方法的评分均高于传统方法的评分，差异有统计学意义（P<0.05）；学生评价数字化方法最主要的优点是"教学方法新颖有趣"和"增加师生互动"。

数字化模型分析和头影测量技术技术有助于提高口腔正畸实验教学的效果，完善现有口腔正畸实验教学手段。

To study the effect of digital model analysis and cephalometrics on orthodontics experimental teaching.

A total of 20 students from Stomatology Grade 2013, Guanghua School of Stomatology, Sun Yat-sen University were randomly divided into two groups, one group with traditional and digital model analysis teaching, another group with traditional and digital cephalometrics teaching. The effects of traditional and digital teaching methods on students′ learning of model analysis and cephalometrics were compared, as well as their measurement accuracy. In the form of questionnaires, the students were asked to grade traditional and digital teaching methods separately, and then evaluate the advantages of digital methods.

Compared with the teacher′s reference value, the measurement difference of dental crowding and the Bolton analysis in model analysis, as well as SNA and MP-FH in cephalometrics using digital methods were (0.4 ± 0.7) mm, (0.7 ± 0.8) %, (3.1 ± 1.3) ° and (4.7 ± 0.4) °. By traditional methods, the measurement difference of these items were (1.8 ± 0.9) mm, (5.6 ± 3.0) %, (5.2 ± 0.8) ° and (7.5 ± 1.3) °, respectively. The measurement differences by digital methods were lower than that of the traditional methods, which were statistically significant (P<0.05) . The score of digital methods was significant higher than that of the traditional methods, respectively (P< 0.05) . In the students′ point of view, the advantages of digital teaching method were mainly "novel and interesting" and "increases the interaction between teachers and students".

Digital model analysis and cephalometrics is helpful to improve the effect of orthodontic experimental teaching, and to supplement the existing orthodontic experimental teaching methods.