Zhang Mei, Zhou Jing, Cheng Fei, Shi Zhong-Mei
Faculty of Stomatology, Shanghai Institute of Health Sciences, China.
Shanghai Kou Qiang Yi Xue. 2006 Oct;15(5):551-4.
To explore how to apply polyhedron method and bisection method reasonably in teaching by comparing the two carving methods for triple-sized plaster tooth.
43 students were randomly divided into two groups as follows: polyhedron method group (n = 22) and bisection method group (n = 21). A comparison was made between the two carving methods by taking right maxillary central incisor carving as a sample for the anterior tooth carving and taking right maxillary first molar carving as a sample for the posterior tooth carving. Paired test and grouped t test were used for data analysis; the results were assessed by SAS6.12 software package.
For the beginners, regarding to right maxillary central incisor carving, there was no significant difference between the two methods (P > 0.05). But regarding to right maxillary first molar carving, the carving performance of polyhedron method group was significant better than bisection method group (P < 0.05). After 11 months, as for the two carvings mentioned above, students in the two groups both had made significant progresses compared with the beginners (P > 0.01). While regarding to right maxillary central incisor carving, progresses of the two groups were not significant (P > 0.05). But regarding to right maxillary first molar carving, the students in bisection method group had made greater progresses than students in polyhedron method group (P < 0.01).
It's concluded that, in order to obtain better teaching effects, carving methods should be chosen appropriately in teaching according to different teeth and different study stages.
通过比较三棱柱法和二分法雕刻三种规格石膏牙的方法，探讨如何在教学中合理应用这两种雕刻方法。
将43名学生随机分为两组：三棱柱法组（n = 22）和二分法组（n = 21）。以前牙雕刻中右上颌中切牙雕刻为样本，后牙雕刻中右上颌第一磨牙雕刻为样本，对两种雕刻方法进行比较。采用配对检验和组间t检验进行数据分析；结果用SAS6.12软件包进行评估。
对于初学者，在右上颌中切牙雕刻方面，两种方法之间无显著差异（P > 0.05）。但在右上颌第一磨牙雕刻方面，三棱柱法组的雕刻表现明显优于二分法组（P < 0.05）。11个月后，对于上述两种雕刻，两组学生与初学者相比均有显著进步（P > 0.01）。在右上颌中切牙雕刻方面，两组的进步不显著（P > 0.05）。但在右上颌第一磨牙雕刻方面，二分法组的学生比三棱柱法组的学生进步更大（P < 0.01）。
得出结论，为了获得更好的教学效果，在教学中应根据不同的牙齿和不同的学习阶段适当选择雕刻方法。
