Influence of implant abutment material on the color of different ceramic crown systems

Publication date: Available online 9 July 2016
Source:The Journal of Prosthetic Dentistry
Author(s): Doğu Ömür Dede, Arzu Armağanci, Gözlem Ceylan, Ersan Çelik, Soner Çankaya, Burak Yilmaz
Statement of problemCeramics are widely used for anterior restorations; however, clinical color reproduction still constitutes a challenge particularly when the ceramic crowns are used on titanium implant abutments.PurposeThe purpose of this in vitro study was to investigate the effect of implant abutment material on the color of different ceramic material systems.Material and methodsForty disks (11×1.5 mm, shade A2) were fabricated from medium-opacity (mo) and high-translucency (ht) lithium disilicate (IPS e.max) blocks, an aluminous ceramic (VITA In-Ceram Alumina), and a zirconia (Zirkonzahn) ceramic system. Disks were fabricated to represent 3 different implant abutments (zirconia, gold-palladium, and titanium) and dentin (composite resin, A2 shade) as background (11×2 mm). Disk-shaped composite resin specimens in A2 shade were fabricated to represent the cement layer. The color measurements of ceramic specimens were made on composite resin abutment materials using a spectrophotometer. CIELab color coordinates were recorded, and the color coordinates measured on composite resin background served as the control group. Color differences (ΔE00) between the control and test groups were calculated. The data were analyzed with 2-way analysis of variance (ANOVA) and compared with the Tukey HSD test (α=.05).ResultsThe ceramics system, abutment material, and their interaction were significant for ΔE00 values (P<.001). Clinically unacceptable results (ΔE00>2.25) were observed for lithium disilicate ceramics on titanium abutments (2.46-2.50). The ΔE00 values of lithium disilicate ceramics for gold-palladium and titanium abutments were significantly higher than for other groups (P<.05).ConclusionThe color results (ΔE00>2.25) of an implant-supported lithium disilicate ceramic restoration may be clinically unacceptable if it is fabricated over a titanium abutment. Zirconia may be a more suitable abutment material for implant-supported ceramic restorations.



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