Douglas R Duane, Hopp Christa D, Augustin Marcus A
Dr. Douglas is Associate Professor and Chair, Department of Restorative Dentistry, School of Dental Medicine, Southern Illinois University; Dr. Hopp is Assistant Professor, Department of Restorative Dentistry, School of Dental Medicine, Southern Illinois University; and Dr. Agustin is Professor, Department of Mathematics and Statistics, Southern Illinois University.
J Dent Educ. 2014 Dec;78(12):1663-72.
The purpose of this study was to evaluate dental students' perceptions of traditional waxing vs. computer-aided crown design and to determine the effectiveness of either technique through comparative grading of the final products. On one of twoidentical tooth preparations, second-year students at one dental school fabricated a wax pattern for a full contour crown; on the second tooth preparation, the same students designed and fabricated an all-ceramic crown using computer-aided design (CAD) and computer-aided manufacturing (CAM) technology. Projects were graded for occlusion and anatomic form by three faculty members. On completion of the projects, 100 percent of the students (n=50) completed an eight-question, five-point Likert scalesurvey, designed to assess their perceptions of and learning associated with the two design techniques. The average grades for the crown design projects were 78.3 (CAD) and 79.1 (wax design). The mean numbers of occlusal contacts were 3.8 (CAD) and 2.9(wax design), which was significantly higher for CAD (p=0.02). The survey results indicated that students enjoyed designing afull contour crown using CAD as compared to using conventional wax techniques and spent less time designing the crown using CAD. From a learning perspective, students felt that they learned more about position and the size/strength of occlusal contacts using CAD. However, students recognized that CAD technology has limits in terms of representing anatomic contours and excursive occlusion compared to conventional wax techniques. The results suggest that crown design using CAD could be considered as an adjunct to conventional wax-added techniques in preclinical fixed prosthodontic curricula.
本研究的目的是评估牙科学生对传统蜡型制作与计算机辅助全冠设计的看法，并通过对最终产品的比较评分来确定这两种技术的有效性。在一所牙科学院，二年级学生在两个相同的牙齿预备体中的一个上制作全冠蜡型；在另一个牙齿预备体上，同样的学生使用计算机辅助设计（CAD）和计算机辅助制造（CAM）技术设计并制作全瓷冠。由三名教员对项目的咬合和解剖形态进行评分。项目完成后，100%的学生（n = 50）完成了一项包含八个问题的五点李克特量表调查，旨在评估他们对这两种设计技术的看法以及与之相关的学习情况。全冠设计项目的平均成绩分别为78.3（CAD）和79.1（蜡型设计）。CAD组的平均咬合接触点数为3.8，蜡型设计组为2.9，CAD组的该数值显著更高（p = 0.02）。调查结果表明，与使用传统蜡型技术相比，学生更喜欢使用CAD设计全冠，并且使用CAD设计全冠花费的时间更少。从学习角度来看，学生认为使用CAD能让他们更多地了解咬合接触的位置以及大小/强度。然而，学生们认识到与传统蜡型技术相比，CAD技术在呈现解剖轮廓和非正中咬合方面存在局限性。结果表明，在临床前固定修复课程中，使用CAD进行全冠设计可被视为传统蜡型技术的一种辅助手段。
