Evaluation of shade correspondence between current monolithic CAD/CAM blocks and target shade tab by considering the inf
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ORIGINAL ARTICLE
Evaluation of shade correspondence between current monolithic CAD/CAM blocks and target shade tab by considering the influence of cement shade and restorative material thickness Salim Ongun1 · Özay Önöral1 · Burcu Günal‑Abduljalil1 Received: 24 April 2020 / Accepted: 11 September 2020 © The Society of The Nippon Dental University 2020
Abstract It was aimed to evaluate shade matching between novel CAD/CAM blocks and the A2 target shade tab by considering the influence of cement shade and restorative material thickness on the chromatic background. A total number of 120 rectangularshaped specimens were subtracted from four different prefabricated CAD/CAM blocks [Vita Enamic (VE), Lava Ultimate (LU), GC Cerasmart (GC), and Vita Mark II (VMII)]. These specimens had thicknesses of 0.5 mm and 1.0 mm. Three different shades (A2, opaque, and translucent) of dual-polymerized resin cement were chosen. The dentin shade (A3.5) restorative composite foundation was incrementally fabricated in a silicon mold. For control group, the A2 shade tab of the Vitapan classical shade guide was used. Different restorative material–cement–foundation assemblies were generated with optic gel. Color readings were performed by using a clinical spectrophotometer, and CIEDE2000 (ΔE00) formula was used to assess color differences. Data were statistically analyzed (α = 0.05). With increasing thickness, color difference values decreased. Higher mean ΔE00 units were observed in all restorative material sub-groups for 0.5 mm thickness. In TR shade, no statistically significant difference was detected among the mean ΔE00 values of 0.5 mm-thick restorative materials. Color differences in groups 1.0 mm-opaque-LU and 1.0 mm-opaque-GC indicated perceptible but clinically acceptable values (0.8˂ΔE00 ≤ 1.8). The highest and lowest ΔE00 units were observed in the 0.5 mm-A2-VE group (ΔE00 = 7.07) and 1 mmopaque-GC group (ΔE00 = 1.46), respectively. Luting cement shade, restorative material type, and thickness significantly influenced the resultant color of restoration. Opaque cement on dentin foundation exhibited lower color differences. Keywords Color · Luting cement shade · Hybrid ceramic blocks · Shade matching · Computer-aided manufacturing
Introduction Rapid progress in CAD/CAM technology has led to the emergence of different machinable restorative materials with enhanced optical and mechanical characteristics for the fabrication of indirect restorations [1–3]. Currently, a plethora of preprocessed blocks is available [1, 2, 4, 5]. Despite the superior esthetic properties of glass ceramics, the demand for stronger ceramic restoration has increased, and thereby, ceramic-reinforced polymers (CRPs) have been introduced [6]. * Salim Ongun [email protected] 1
Department of Prosthodontics, Faculty of Dentistry, Near East University, Near East Boulevard, 99138 Mersin 10, Nicosia, Turkey
CRPs combine the positive properties of ceramic and composite materials and thereby provide superior properties: (1) they exhibit superior fatigue r
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