Division of Oral Radiology, Department of Oral Diagnosis, Piracicaba Dental School, University of Campinas, Piracicaba, Brazil.
Department of Community Dentistry, Piracicaba Dental School, University of Campinas, Piracicaba, Brazil.
Oral Surg Oral Med Oral Pathol Oral Radiol. 2019 May;127(5):444-450. doi: 10.1016/j.oooo.2019.01.003. Epub 2019 Jan 9.
The aim of this study was to evaluate interpretation conditions in the subjective in vitro assessment of dental tissue-equivalent radiographic contrast.
Radiographic images with the density of dental structures were randomized and arranged in 20 sequences with images juxtaposed and separated. Twelve observers interpreted the sequence among the most radiolucent and radiopaque images with 3 displays, 3 horizontal viewing angles, and 3 ambient light conditions. The evaluation time was recorded. The hit percentage was calculated for each evaluation. Three-way analysis of variance with Tukey's test was used to compare the conditions of interpretation. The intraclass correlation coefficient was used to assess agreement (α = 0.05).
No differences in hit percentages were found among the 3 displays or among the juxtaposed and separated images. Increased hit percentages were recorded for images assessed at 90° compared with 45° for all displays and in high ambient light vs intermediate and low light at 90°. Increased evaluation time was recorded for the consumer-grade display under high ambient light and for the separated images.
The subjective in vitro assessment of dental tissue-equivalent radiographic contrast is not influenced by computer display, which should be viewed at a horizontal viewing angle of 90° and under high ambient light. Longer evaluation times may be expected with consumer-grade displays.
本研究旨在评估牙科组织等效射线照相对比度主观体外评估中的解读条件。
随机排列具有不同密度的牙科结构射线照相图像，将图像并列和分开排列在 20 个序列中。12 名观察者在 3 种显示方式、3 种水平观察角度和 3 种环境光照条件下对最透明和最不透明的图像序列进行解读。记录评估时间。为每个评估计算命中率。使用三因素方差分析和 Tukey 检验比较解读条件。使用组内相关系数评估一致性（α=0.05）。
在 3 种显示方式或并列和分开的图像之间，命中率没有差异。与所有显示方式的 45°相比，90°观察时的命中率增加，与中光和低光相比，90°的高光环境下的命中率增加。在高光环境下，消费者级显示器的评估时间增加，而在分开的图像中则增加。
牙科组织等效射线照相对比度的主观体外评估不受计算机显示器的影响，显示器应在 90°水平观察角度和高光环境下观察。消费者级显示器的评估时间可能会更长。
