title: [Effect of ceramic thickness and resin cement shades on final color of heat-pressed ceramic veneers].
abstract: Objective:To analyze the effect of ceramic materials thickness and resin cement shades on the final color of ceramic veneers in the discolored teeth, and to investigate the color agreement of try-in pastes to the corresponding resin cements.Methods:Sixty artificial maxillary central incisor teeth (C2 shade) were used to simulate the natural discolored teeth and prepared according to veneer tooth preparation protocol. Veneers of different thickness in the body region (0.50 and 0.75 mm) were fabricated using ceramic materials (LT A2 shade, IPS e.max Press). The ceramic veneer specimens were bonded to the artificial teeth using the 6 shades of resin cements (Variolink Veneer: shades of LV-3, LV-2, HV+3; RelyX™ Veneer: shades of TR, A3, WO) (n=5). A clinical spectrophotometer was used to measure the color parameters of ceramic veneers at the cervical, body and incisal regions. Color changes of veneers before and after cementation were calculated and registered as ΔE1, and the changes between try-in paste and the corresponding resin cements were registered as ΔE2.Results:Three-way ANOVA indicated that ΔE1 and ΔE2 values were significantly affected by the ceramic thickness, resin cement shades and measuring regions (P<0.05). The ΔE1 values of six shades ranged from 0.59-8.27. The ΔE1 values were more than 2.72 when the ceramic veneers were cemented with resin cements in shades of HV+3 and WO. The ΔE2 values of six shades ranged from 0.60-2.56. The shades of HV+3, WO and A3 resin cements were more than 1.60.Conclusions:Different thickness of ceramic materials, resin cement shades and measuring regions could affect the final color of ceramic veneers. The color differences of some resin cements and corresponding try-in pastes might be observed in clinical practice.
authors.affiliation: Department of Prosthodontics, Dalian Stomatological Hospital, Dalian Liaoning 116021, China (Present address: Department of Pediatric Dentistry, Yantai Stomatological Hospital Affiliated to Binzhou Medical College, Yantai Shandong 264001, China).
authors.forename: D F
authors.initials: DF
authors.lastname: Ren
authors.affiliation: Department of Stomatology, The NO.2 Hospital of Baoding, Baoding Hebei 071000, China.
authors.forename: K R
authors.initials: KR
authors.lastname: Zhan
authors.affiliation: Department of Prosthodontics, Dalian Stomatological Hospital, Dalian Liaoning 116021, China.
authors.forename: X D
authors.initials: XD
authors.lastname: Chen
authors.affiliation: Department of Prosthodontics, Dalian Stomatological Hospital, Dalian Liaoning 116021, China.
authors.forename: W Z
authors.initials: WZ
authors.lastname: Xing
mesh_terms: D002484:Cementation; D002516:Ceramics; D003116:Color; D003776:Dental Porcelain; D003801:Dental Veneers; D006358:Hot Temperature; D006801:Humans; D007180:Incisor; D008422:Materials Testing; D011312:Pressure; D019279:Resin Cements / Q000737:chemistry; D013053:Spectrophotometry; D014075:Tooth Discoloration / Q000628:therapy*
chemical_list: C508050:IPS e.max Press; D019279:Resin Cements; D003776:Dental Porcelain; C103502:Variolink
keywords: Ceramics; Dental veneers; Esthetics, dental