Sommers Tracey Malarkey, Mauriello Sally M, Ludlow John B, Platin Enrique, Tyndall Donald A
Lorain County Community College, Elyria, Ohio, USA.
J Dent Hyg. 2002 Winter;76(1):26-33.
The purpose of this study was to compare dental hygiene student radiographic performance using film and charge-coupled device (CCD) systems. Specific objectives were to compare the 1) number of technique errors, 2) error type, 3) retake frequency, and 4) learning experience using both systems.
Twenty-eight subjects exposed two 18-projection full series, one film-based, and one CCD-based system, on a manikin. One examiner, using standardized image quality criteria, evaluated all images. Each subject was assigned to one of four focus groups. Quantitative data were analyzed using ANOVA and Wilcoxon tests. Emic expressions and percentages were used to report qualitative data with themes supported by performance data.
A greater number of technique errors occurred using the CCD system than the film system (p < 0.0001), with vertical angulation being the most common error (53%). Using the film-based system, 66% of the errors were due to incorrect horizontal angulation. Subjects exposed an average of 10 retakes per series using the CCD versus 3 retakes using film. Forty-four percent of the subjects felt their most common CCD errors were film placement and vertical angulation compared to 59% who believed horizontal angulation was the main technique error when using film. Difficulty placing the CCD sensor intraorally was expressed by 74%. The CCD system was reported to be beneficial for teaching theory (67%), with 59% preferring film for learning the psychomotor skill.
In pre-clinical situations, the CCD system may be an effective tool for teaching technique. Radiographic errors are dependent on the type of image receptor used.
本研究旨在比较牙科卫生专业学生使用胶片系统和电荷耦合器件（CCD）系统进行放射成像的表现。具体目标是比较：1）技术错误数量；2）错误类型；3）重拍频率；4）使用这两种系统的学习体验。
28名受试者在人体模型上分别使用基于胶片的系统和基于CCD的系统拍摄两组各18张投照的全口系列影像。由一名检查者依据标准化的图像质量标准对所有影像进行评估。每位受试者被分配到四个焦点小组之一。定量数据采用方差分析和威尔科克森检验进行分析。采用主位表达和百分比报告定性数据，并辅以表现数据支持的主题。
与胶片系统相比，使用CCD系统出现的技术错误更多（p < 0.0001），垂直角度错误最为常见（53%）。在基于胶片的系统中，66%的错误是由于水平角度不正确。使用CCD系统时，受试者每组平均重拍10次，而使用胶片时平均重拍3次。44%的受试者认为他们在使用CCD时最常见的错误是传感器放置和垂直角度，相比之下，59%的受试者认为使用胶片时主要的技术错误是水平角度。74%的受试者表示将CCD传感器放置在口腔内有困难。据报告，CCD系统对理论教学有益（67%），59%的人更喜欢使用胶片来学习操作技能。
在临床前的情况下，CCD系统可能是一种有效的技术教学工具。放射成像错误取决于所使用的图像接收器类型。
