数字化口腔修复（25）--牙体预备重合率的数字化评价

摘要

Objective:To assess the differences of preparations in pre⁃clinical dental students before and after the comprehensive tooth preparation training through the PrepCheck 2�0 ( CEREC® ) software of the computer aided design ( CAD) . Methods:Forty junior dental students were randomly selected for participating the 14 days preclinical tooth prepara⁃tion training which contained the studies of a 3D video of tooth preparation,the application of the CAD system(SW 4�4,Prep⁃Check 2�0). Each student was required to prepare 2 teeth before and after training,respectively. The rates of overlap between the experimental tooth preparations and the master mold,including the shoulder and morphology,were calculated by the Prep⁃Check 2�0 software. The differences were compared between the rates of overlap in tooth preparation before and after training, respectively. Results:There was significant improvement after training in the rates of overlap between the prepared shoulder and the pre⁃defined shoulder,experimental preparation and the master preparation(P<0�05). Conclusion:The courses of pre⁃clini⁃cal comprehensive training can effectively improve the student’ s tooth preparation skill,and the quality of tooth preparations.%目的：通过计算机辅助设计（ computer aided design，CAD）系统中的牙体预备评估软件PrepCheck 2�0（CEREC®）获取上颌前牙全瓷冠预备体肩台与预设肩台的重合率以及预备体与标准预备体的总体重合率，以评估临床前期牙体预备综合性培训前后学生牙体预备质量的变化。方法：随机选择口腔医学专业大学三年级上学期学生40名，进行临床前期牙体预备培训，课程共计14 d，内容包括牙体预备3D视频和CAD系统（ SW 4�4，PrepCheck 2�0）的运用。培训前后每位学生各预备2颗预备体。通过评估软件PrepCheck 2�0测量预备体的肩台重合率和预备体与标准预备体的总体重合率，分析两者培训前和培训后的差异。结果：培训后的预备体的肩台重合率和总体重合率均优于培训前（P＜0�05）。结论：临床前期牙体预备的综合性培训课程能有效提高学生的牙体预备技能。