Department of Social Dentistry, Araraquara Dental School, UNESP, Univ Estadual Paulista, Araraquara, Brazil.
Eur J Dent Educ. 2019 Aug;23(3):373-377. doi: 10.1111/eje.12439. Epub 2019 Jun 2.
The aim of this study was to determine any correlations between difficulty in performing restorative procedures and the adoption of ergonomic posture by dental students in a preclinical course.
The sample was composed of second-year undergraduate students enrolled in the School of Dentistry of São Paulo State University (UNESP), Araraquara (n = 56). The data were collected from weekly records in which students who had participated in training in a preclinical restorative dentistry laboratory registered the difficulty they experienced performing given proposed preclinical procedures and adopting ergonomic posture (positioning of students' legs, thighs, spine, arms, and forearms, as well as the positioning of both the dental light and the dental mannequin's head, the distance between the operating field and the operator's eyes, and the location of the instruments used in the procedures). Answers were provided on a scale of zero to ten points (zero = no difficulty; 10 = maximum difficulty). A descriptive statistical analysis was performed. The correlation between the level of difficulty in performing the restorative procedures and in the adoption of ergonomic posture was estimated using the Pearson correlation coefficient (r), and its significance was tested using Student's t test. To evaluate the effect of time on students' perceived difficulties in implementing ergonomic posture, the first 2 weeks of training was defined as the initial time, whilst the last 2 weeks was defined as final time (scores from these periods were averaged). After the normality assumptions were verified, Student's t test for paired samples was performed. The significance level adopted was <5%.
A correlation was found between the difficulty students experienced performing the preclinical procedures and their difficulties implementing ergonomic posture; the correlation was significant, though the correlation ranged from slight to moderate (P < 0.001; r = 0.38-0.63). In addition, the data also showed that the students' perceptions of how difficult it was to implement these posture items decreased significantly over time (P < 0.001).
The correlation between perceived difficulty in performing the preclinical restorative dentistry procedures and the application of ergonomic posture was slight to moderate, and the students' perceived difficulties in maintaining ergonomic posture decreased over the course of the school year.
本研究旨在确定牙科学生在临床前课程中进行修复操作的难度与采用符合人体工程学姿势之间的任何相关性。
该样本由参加圣保罗州立大学（UNESP）阿雷格里港牙科学院二年级本科生组成（n=56）。数据是从每周记录中收集的，参加临床前修复牙科实验室培训的学生记录了他们在进行给定的临床前程序和采用符合人体工程学姿势（学生腿部、大腿、脊柱、手臂和前臂的位置，以及牙科灯和牙科人体模型头部的位置、操作区域与操作人员眼睛之间的距离以及程序中使用的器械的位置）时所经历的难度。答案以 0 到 10 分制（0=无难度；10=最大难度）给出。进行了描述性统计分析。使用 Pearson 相关系数（r）估计修复程序执行难度与采用符合人体工程学姿势之间的相关性，并使用 Student t 检验检验其显著性。为了评估时间对学生实施符合人体工程学姿势的感知难度的影响，将培训的前 2 周定义为初始时间，将最后 2 周定义为最终时间（将这两个时间段的分数平均）。在验证了正态性假设后，进行了配对样本 Student t 检验。采用的显著性水平为<5%。
学生在进行临床前操作的难度与他们在实施符合人体工程学姿势的难度之间存在相关性；相关性显著，尽管相关性范围从轻微到中度（P<0.001；r=0.38-0.63）。此外，数据还表明，随着时间的推移，学生对实施这些姿势项目的难度的感知显著降低（P<0.001）。
感知到执行临床前修复牙科程序的难度与应用符合人体工程学姿势之间的相关性从轻微到中度，并且学生在整个学年中保持符合人体工程学姿势的难度感知降低。
