Effect of cement color and tooth‐shaded background on the final color of lithium disilicate and zirconia‐reinforced lithium silicate ceramics: An in vitro study

Abstract

Objective: To evaluate the translucency and effects of different cement colors on the final shade of lithium disilicate ceramics (LDS) and zirconia-reinforced lithium silicate ceramics (ZLS) over an A1 and A3 tooth-shaded background. Materials and Methods: Eighty-eight rectangular-shaped specimens were sliced from LDS and ZLS blocks. The final thickness of the specimens was set at 0.8 ± 0.01 mm. Spectrophotometric measurements for the translucency were taken against black and white backgrounds. Composite resin tooth-shaded background disks were fabricated in two shades (A1 and A3), as were resin cement disks (opaque and translucent) (n = 11). Next, the ceramic specimens and tooth-shaded backgrounds were connected with glycerin, and baseline measurements were taken. These measurements were used as a reference. Then, the ceramic specimens, cement specimens, and tooth-shaded backgrounds were connected together with glycerin, and a second set of measurements was taken. The CIEDE2000 (ΔE 00) color formula was used to calculate the translucency and color differences. A Mann-Whitney U test was also performed for the translucency, and a three-way ANOVA (analysis of variance) test was performed for the ΔE 00 values (α = .05). Results: The LDS and ZLS groups had similar translucency (P = .055). The ΔE 00 values of the specimens were significantly affected by the cement color and tooth-shaded backgrounds in the LDS and ZLS groups (P < .05). Using the opaque cement color resulted in statistically significant differences against the light and dark (A1 and A3) tooth-shaded backgrounds in both the LDS and ZLS groups (P = .022 and P = .006). Conclusions: The material type did not affect the translucency or final color. However, the cement color did affect the final shade when thin ceramic restorations were used. Clinical Significance: It should be noted that the cement color and tooth-shaded background used may change the final color of thin high translucency ceramic restorations that contain lithium disilicate and zirconia-reinforced lithium silicate.

Colour agreement between try‐in paste and resin cement: effect of background on zirconia‐reinforced lithium silicate

“…It was concluded that both the white and clear resin cement shade groups could not mask the dark background. Those results were similar to the study of Yıldırım et al 8 Diniz et al 14 examined the colour agreement between Variolink Veneer and Allcem Veneer resin cement and try-in pastes in 1.0 and 0.5 mm thickness lithium disilicate specimens and found colour correspondence in the 1.0 mm ceramic specimens for the Variolink Veneer and Allcem Veneer systems. Mourouzis et al 24 investigated the color agreement between Variolink Veneer and Variolink Esthetic LC resin cement and try-in pastes on lithium disilicate material, and they concluded that significant colour differences were found between resin cements and their corresponding try-in pastes.…”

“…27 However, besides the material type, dental background colour, restoration thickness and cement colour are also vital to obtain desirable aesthetic results for translucent ceramic restorations. [6][7][8] Studies about colour measurement related to zirconia-reinforced lithium disilicate (about 10% by weight), which has lower translucent values compared to lithium disilicate ceramics, are limited. 28 Therefore, in this study, the masking ability of zirconia-reinforced lithium silicate ceramics with different shades of try-in pastes and resin cement on A1 and A3 backgrounds were investigated.…”

“…Based on previous studies, the perceptible and acceptable thresholds of ΔE 00 ranged between 1.0 and 6.8. 8,[30][31][32] However, in the literature, the most frequently accepted perceptibility and acceptability values were found to be 1.0 to 3.3. 18 The perceptibility threshold (ΔE < 1.0) cannot be identified by the human eye, whereas 1.0 < ΔE < 3.3 can be defined and is regarded as clinically acceptable.…”

“…Various factors can affect the final colour of ceramic restorations, such as ceramic type and thickness, resin cement colour and thickness and dental background colour. [5][6][7][8] Restoration try-in could be utilized as a guide to obtaining the desired final colour before final cementation. 9 Try-in process can be applied with hydrosoluble gel (Aquagel ® ; Adams Healthcare, Leeds, UK) or try-in pastes.…”

Kahve ile Renklendirmenin Kompozit Rezinlerde Renk Stabilitesi ve Translusensi Parametresi Üzerindeki Etkisinin Değerlendirilmesi

“…9 Renk eşleştirmeleri geleneksel olarak renk kılavuzları ile gerçekleştirilmesine rağmen, spektrofotometreler renklerin sayısal ifadeleriyle standartlaştırılmış, nesnel ve doğru ölçümler sağladıkları için popüler bir renk eşleştirme aracı haline gelmiştir. 10 Translusensi, bir materyalin ışığı geçirme durumu olarak tanımlanır. Translusensi parametresi (TP), dental materyallerin yarı saydamlığını değerlendirmek için kullanılmaktadır.…”