Visual Assessment of Color Difference.

色差的视觉评估。

• 批准号: 6504766
• 负责人: ALVIN G WEE
• 金额: $ 12.66万
• 依托单位: OHIO STATE UNIVERSITY
• 依托单位国家: 美国
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-08-01 至 2005-09-30
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/6504766
• 关键词: behavior test; behavioral /social science research tag; biomaterial evaluation; clinical research; color visions; computer data analysis; dental materials; dental prosthesis; human subject; interview; pigmentation; porcelain; preference; psychophysics; quality of life; satisfaction; statistics /biometry; tooth surface; visual perception

DESCRIPTION (provided by applicant): Expanded knowledge and clinical application of the optical properties of natural teeth, skin, dental and maxillofacial materials are necessary as a long-range goal for improved color replication involving both intra- and extra-oral restorative procedures. Patients needing restorative dental treatment and/or facial prosthetic reconstruction can experience improved quality of life with the advancement of the dental color replication process. By applying established psychophysical methodology, the following specific aims target improving the accuracy of the color replication process for dentistry: (1) To determine the color difference formula that provides the best indicator for perceptibility and acceptability of small color differences by human observers and (2) To determine the difference and magnitude of perceptible and acceptable color differences within the color range of human dentition. Methods: Anterior tooth color measurements will be taken from 50 subjects to determine the range of color of human dentition (Experiment I). This information will be used to plan color differences between standard "tooth" and comparison "restoration" pairs (Phases I, II, III of Experiment II). Three different sets of 24 subjects will be recruited, one for each phase. The subject population consists of four observer groups: dentists, auxiliaries, technicians and patients. Subjects will evaluate perceivable and acceptable color differences among the tooth/restoration pairs that are presented (1) as disks fabricated with opaque porcelain - Phase I, (2) as disk models on a computer screen - Phase II, or (3) as three-dimensional adjacent "tooth" and "crown" models on a computer face model - Phase III. From our preliminary study, the proposed distribution of the color difference between standard and comparisons are 0,0.5,1, 1.5, 3, 4.5 delta Es. The magnitude of the color difference will be due to variations according to either a change in direction of L*a* or b*. Statistical analyses: The receiver operator characteristics curve (ROC) will be generated for each subject's data and the various color difference formulas for perceptibility and acceptability. The area under the curves will be calculated and ranked. The optimal factor for the CMC color difference formula will be determined using designed experimental sets. A repeated measures analysis of variance (alpha= 0.05) will be applied to determine statistical significance of fit among the observer groups; the CIELAB color difference formula and the optimal CMC color difference formula for both perceptibility and acceptability. The 50:50 delta E point for perceptibility and acceptability will be determined for each observer group and each formula. Tukey's Studentized Range Test (alpha=O.05) will be used as a post hoc test. A chi-square test will compare data from phase I and II to assess validation of the computer with the actual sample model.

描述（由申请人提供）：扩大自然牙齿、皮肤、牙科和颌面材料的光学特性的知识和临床应用是必要的，这是改善口腔内和口腔外修复程序的颜色复制的长期目标。需要修复性牙科治疗和/或面部修复重建的患者可以体验到随着牙齿颜色复制过程的进步而改善的生活质量。通过应用已建立的心理物理学方法，以下具体目标旨在提高牙科颜色复制过程的准确性：（1）确定色差公式，该公式为人类观察者对小色差的感知性和可接受性提供最佳指标，以及（2）确定人类牙列颜色范围内可感知和可接受色差的差异和幅度。方法：对50名受试者的前牙进行颜色测量，以确定人类牙列的颜色范围（实验I）。该信息将用于计划标准“牙齿”和比较“修复体”对之间的色差（实验II的第一、二、三阶段）。将招募三组不同的24例受试者，每个阶段一组。受试者人群由四个观察组组成：牙医、辅助人员、技术人员和患者。受试者将评估牙齿/修复体对之间可感知和可接受的色差，这些牙齿/修复体对呈现为（1）用不透明瓷制造的盘-阶段I，（2）计算机屏幕上的盘模型-阶段II，或（3）计算机面部模型上的三维相邻“牙齿”和“牙冠”模型-阶段III。根据我们的初步研究，标准品和对照品之间色差的建议分布为0，0.5，1，1.5，3，4.5 Δ Es。色差的大小将是由于根据L*a* 或B* 的方向变化的变化。统计分析：将为每例受试者的数据生成受试者操作特征曲线（ROC），并使用各种色差公式进行感知性和可接受性分析。将计算曲线下面积并进行排序。CMC色差公式的最佳因子将使用设计的实验组来确定。将应用重复测量方差分析（α = 0.05）确定观察者组之间拟合的统计学显著性; CIELAB色差公式和最佳CMC色差公式用于感知性和可接受性。将确定每个观察员组和每个配方的可感知性和可接受性的50：50 Δ E点。Tukey学生化范围检验（α = 0.05）将用作事后检验。卡方检验将比较第一阶段和第二阶段的数据，以评估计算机与实际样本模型的有效性。

项目成果

Color and translucency of enamel in vital maxillary central incisors.

重要的上颌中切牙牙釉质的颜色和半透明度。

• DOI: 10.1016/j.prosdent.2022.01.010
• 发表时间: 2023-12
• 期刊: JOURNAL OF PROSTHETIC DENTISTRY
• 影响因子: 4.6
• 作者: Wee, Alvin G.;Winkelmann, Damian A.;Gozalo, David J.;Ito, Masayasu;Johnston, William M.
• 通讯作者: Johnston, William M.

Estimating the color of maxillary central incisors based on age and gender.

根据年龄和性别估计上颌中枢的颜色。

• DOI: 10.1016/s0022-3913(08)60155-9
• 发表时间: 2008-08
• 期刊: JOURNAL OF PROSTHETIC DENTISTRY
• 影响因子: 4.6
• 作者: Gozalo-Diaz, David;Johnston, William M.;Wee, Alvin G.
• 通讯作者: Wee, Alvin G.