title: Color difference threshold determination for acrylic denture base resins.
abstract: This study aimed to set evaluation indicators, i.e., perceptibility and acceptability color difference thresholds, of color stability for acrylic denture base resins for a spectrophotometric assessing method, which offered an alternative to the visual method described in ISO 20795-1:2013. A total of 291 disk specimens 50±1 mm in diameter and 0.5±0.1 mm thick were prepared (ISO 20795-1:2013) and processed through radiation tests in an accelerated aging chamber (ISO 7491:2000) for increasing times of 0 to 42 hours. Color alterations were measured with a spectrophotometer and evaluated using the CIE L*a*b* colorimetric system. Color differences were calculated through the CIEDE2000 color difference formula. Thirty-two dental professionals without color vision deficiencies completed perceptibility and acceptability assessments under controlled conditions in vitro. An S-curve fitting procedure was used to analyze the 50:50% perceptibility and acceptability thresholds. Furthermore, perceptibility and acceptability against the differences of the three color attributes, lightness, chroma, and hue, were also investigated. According to the S-curve fitting procedure, the 50:50% perceptibility threshold was 1.71ΔE00 (r(2)=0.88) and the 50:50% acceptability threshold was 4.00 ΔE00 (r(2)=0.89). Within the limitations of this study, 1.71/4.00 ΔE00 could be used as perceptibility/acceptability thresholds for acrylic denture base resins.
authors.affiliation: Department of Dental Materials, School of Stomatology, Peking University, Beijing, China.|National Engineering Laboratory for Digital and Material Technology of Stomatology, Peking University, Beijing, China.
authors.forename: Jiabao
authors.initials: J
authors.lastname: Ren
authors.affiliation: Department of Dental Materials, School of Stomatology, Peking University, Beijing, China.|National Engineering Laboratory for Digital and Material Technology of Stomatology, Peking University, Beijing, China.
authors.forename: Hong
authors.initials: H
authors.lastname: Lin
authors.affiliation: National Laboratory of Color Science & Engineering, School of Information Science & Technology, Beijing Institute of Technology, Beijing, China.
authors.forename: Qingmei
authors.initials: Q
authors.lastname: Huang
authors.affiliation: Department of Actuarial Science, Boston University, Boston, MA, US.
authors.forename: Qifan
authors.initials: Q
authors.lastname: Liang
authors.affiliation: Department of Dental Materials, School of Stomatology, Peking University, Beijing, China.|National Engineering Laboratory for Digital and Material Technology of Stomatology, Peking University, Beijing, China.
authors.forename: Gang
authors.initials: G
authors.lastname: Zheng
mesh_terms: D000180:Acrylic Resins / Q000032:analysis / Q000737:chemistry* / Q000592:standards; D003116:Color / Q000592:standards*; D003118:Color Perception / Q000502:physiology; D003124:Colorimetry / Q000379:methods / Q000592:standards*; D003764:Dental Materials / Q000032:analysis / Q000737:chemistry* / Q000592:standards; D003819:Denture Bases / Q000592:standards*; D019544:Equipment Failure Analysis / Q000379:methods / Q000592:standards; D004955:Esthetics, Dental; D006801:Humans; D008422:Materials Testing / Q000379:methods / Q000592:standards*; D017797:Prosthesis Coloring / Q000379:methods / Q000592:standards; D011474:Prosthesis Design; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity
chemical_list: D000180:Acrylic Resins; D003764:Dental Materials
keywords: Acrylic denture base resin; CIEDE2000; acceptability threshold; perceptibility threshold; spectrophotometer