Clinic of General, Special Care, and Geriatric Dentistry, Center of Dental Medicine, University of Zurich, Zurich, Switzerland.
Division of Gerodontology and Removable Prosthodontics, University Clinics of Dental Medicine, University of Geneva, Geneva, Switzerland.
J Oral Rehabil. 2020 Dec;47(12):1496-1502. doi: 10.1111/joor.13094. Epub 2020 Oct 8.
The two-colour mixing test is a quick method to assess chewing function (CF). The use of smartphone cameras for acquiring images may help in further simplifying the process.
This study evaluated the reliability of smartphone-camera images of chewing gums to assess CF.
Five test samples of a bicoloured chewing gum were produced by a single fully dentate adult volunteer. The specimens were flattened to 1-mm thick wafers. The two sides of the wafers were digitised with a conventional flatbed scanner (control) and were photographed 20 times using 8 different smartphones. The images were assessed optoelectronically to obtain the variance of hue (VoH) and subjectively by visual assessment (SA) using a categorical scale (SA1-SA5). Spearman's correlation and regression models were used for statistical analyses.
The intra-group variability for SA1-SA3 was <1% for all smartphones, but significantly higher than controls for SA4 and SA5 (smartphone: SA4 = 5.57%; SA5 = 8.76%; control: SA4 = 2.5%; SA5 = 0.79%). VoH was progressively lower from SA1 to SA5 for all imaging devices (r > -.97; P < .001). VoH comparisons between control and smartphone images revealed significant differences for the individual SA categories, and however, the magnitude of differences was small and non-significant when the full range of SA levels were considered. The linear mixed model regression showed significant effects for all the smartphones (P < .001) and SA levels (P < .001) in relation to the flatbed scanner values.
Smartphone cameras may be used to evaluate colour mixture for a bolus-kneading test, however, the precision is lower with higher degrees of colour mixing.
双色混合测试是一种快速评估咀嚼功能（CF）的方法。使用智能手机摄像头获取图像可能有助于进一步简化该过程。
本研究评估了智能手机摄像头拍摄的咀嚼胶图像评估 CF 的可靠性。
由一名全牙列成年人志愿者制作了五个双色咀嚼胶测试样本。将样本压平至 1 毫米厚的薄片。使用传统的平板扫描仪（对照）对薄片的两面进行数字化，并使用 8 种不同的智能手机拍摄 20 次照片。使用光电方法评估图像以获得色调方差（VoH），并使用分类量表（SA1-SA5）进行主观评估（SA）。使用 Spearman 相关和回归模型进行统计分析。
所有智能手机的 SA1-SA3 的组内变异性均<1%，但 SA4 和 SA5 的变异性明显高于对照组（智能手机：SA4=5.57%；SA5=8.76%；对照组：SA4=2.5%；SA5=0.79%）。对于所有成像设备，VoH 从 SA1 到 SA5 逐渐降低（r>.97；P<.001）。在考虑到所有 SA 水平时，与对照组相比，智能手机图像的 VoH 比较在个体 SA 类别之间存在显著差异，但差异幅度较小且无统计学意义。线性混合模型回归显示，所有智能手机（P<.001）和 SA 水平（P<.001）与平板扫描仪值相关均具有显著影响。
智能手机摄像头可用于评估团块揉捏试验的颜色混合，但颜色混合程度越高，精度越低。
