Silva L C, Nogueira T E, Rios L F, Schimmel M, Leles C R
Department of Prevention and Oral Rehabilitation, School of Dentistry, Federal University of Goias, Goiania, Brazil.
Division of Gerodontology, School of Dental Medicine, University of Bern, Bern, Switzerland.
J Oral Rehabil. 2018 Apr;45(4):301-307. doi: 10.1111/joor.12609. Epub 2018 Feb 9.
The aim of this study was to test the reliability of a method to measure the masticatory performance of complete denture wearers employing a colour-mixing ability test and assessment by visual and electronic colourimetric analysis. A sample of 75 subjects was selected from patients who received new conventional complete dentures. Masticatory tests were performed using a two-colour chewing gum that was masticated for 5, 10, 20, 30 and 50 chewing cycles, performed in a random order. The mixing level of the two colours of the chewed gum was assessed visually by two independent raters based on a 5-point ordinal scale. The specimens were flattened into a 1-mm-width wafer, scanned and saved as a two-sided digital image. Each pair of images was submitted to an electronic colourimetric analysis to assess the level of colour mixture, measured by the circular variance of hue (VOH). Overall inter- and intra-rater agreements in visual analysis were 64% and 68%, respectively (almost 99% of scores ranged within ±1 point), whilst overall weighted kappa was >0.80. A proportional increase in the level of mixture occurred with increased number of chewing cycles (P < .001). Similarly, VOH and the visual analysis were highly correlated (r = -.89; P < .001). Bland-Altman plots revealed excellent agreement and extremely low systematic error between duplicated VOH measures. It was concluded that the two-colour chewing gum test is a reliable method to assess the masticatory performance in complete denture wearers using both visual and electronic colourimetric analyses.
本研究的目的是通过颜色混合能力测试以及视觉和电子比色分析评估，来检验一种测量全口义齿佩戴者咀嚼性能方法的可靠性。从接受新的传统全口义齿的患者中选取了75名受试者作为样本。使用双色口香糖进行咀嚼测试，口香糖咀嚼5、10、20、30和50个咀嚼周期，测试顺序随机。由两名独立评分者根据5分有序量表对咀嚼后口香糖的两种颜色的混合程度进行视觉评估。将样本压平成1毫米宽的薄片，进行扫描并保存为双面数字图像。每对图像都进行电子比色分析，以评估颜色混合程度，通过色调的圆形方差（VOH）来测量。在视觉分析中，评分者间和评分者内的总体一致性分别为64%和68%（几乎99%的分数在±1分范围内），而总体加权kappa大于0.80。随着咀嚼周期数的增加，混合程度呈比例增加（P <.001）。同样，VOH与视觉分析高度相关（r = -.89；P <.001）。Bland-Altman图显示，重复测量的VOH之间具有极好的一致性和极低的系统误差。得出的结论是，双色口香糖测试是一种可靠的方法，可通过视觉和电子比色分析来评估全口义齿佩戴者的咀嚼性能。
