title: The effect of ceramic thickness and resin cement shades on the color matching of ceramic veneers in discolored teeth.
abstract: The objective of this study was to analyze the effects of ceramic material thickness and resin cement shade on the color matching of ceramic veneers at the gray tooth structures. Seventy-two artificial maxillary right central incisor teeth (C2 shade) were prepared according to veneer tooth preparation in practice. Ceramic materials (LT, A2 shade, IPS e.max Press) were selected to fabricate the 0.50- and 0.75-mm thick veneers at the body region. The ceramic veneer specimens were bonded to the artificial teeth by the 6 shades of resin cements (Variolink Veneer: shades of HV+3, LV-2, LV-3; and RelyXTMVeneer: shades of WO, TR, A3). A clinical spectrophotometer (Crystaleye, Olympus) was used to measure the color parameters. The color differences (ΔE values) of ceramic veneers and A2 shade tab (Vitapan Classical, Vita) and C*abvalues were calculated. The results of three-way ANOVA indicated that the ΔE values of ceramic veneer and A2 shade tab were significantly different in the thickness of ceramic materials, shades of resin cements, and measuring regions (p < 0.001). There were significant differences in 0.50-mm-thick ceramic veneers that exhibited higher ΔE values compared with veneers that were 0.75-mm thick. Tukey's HSD test showed that the average ΔE values in body region were significantly smaller than that in cervical and incisal regions. The color matching of ceramic veneers was significantly influenced not only by the ceramic thickness and the resin cement shades but also the tooth regions.
authors.affiliation: Department of Prosthetics, Dalian Stomatological Hospital, Dalian, 116021, China.
authors.forename: Wenzhong
authors.initials: W
authors.lastname: Xing
authors.affiliation: Department of Prosthetics, Dalian Stomatological Hospital, Dalian, 116021, China.
authors.forename: Xiaodong
authors.initials: X
authors.lastname: Chen
authors.affiliation: Department of Prosthetics, Dalian Stomatological Hospital, Dalian, 116021, China.
authors.forename: Dafei
authors.initials: D
authors.lastname: Ren
authors.affiliation: Department of Prosthetics, Dalian Stomatological Hospital, Dalian, 116021, China.
authors.forename: Kangru
authors.initials: K
authors.lastname: Zhan
authors.affiliation: Key Laboratory for Oral Biomedical Engineering, Ministry of Education, School and Hospital of Stomatology, Wuhan University, 237 Luoyu Road, Wuhan, 430079, China. wang.yn@whu.edu.cn.
authors.forename: Yining
authors.initials: Y
authors.lastname: Wang
mesh_terms: D002516:Ceramics / Q000737:chemistry*; D003116:Color; D003801:Dental Veneers; D006801:Humans; D066298:In Vitro Techniques; D007180:Incisor; D008422:Materials Testing; D017797:Prosthesis Coloring; D019279:Resin Cements / Q000737:chemistry*; D013053:Spectrophotometry; D013499:Surface Properties; D014075:Tooth Discoloration / Q000628:therapy*
chemical_list: D019279:Resin Cements
keywords: Ceramic veneer; Color difference; Resin cement; Thickness