J Adv Prosthodont.  2018 Feb;10(1):32-42. 10.4047/jap.2018.10.1.32.

Comparative color and surface parameters of current esthetic restorative CAD/CAM materials

• Egilmez F
• Ergun G
• Cekic-Nagas I
• Vallittu P
• Lassila LV

• KMID: 2403996
• DOI: http://doi.org/10.4047/jap.2018.10.1.32

Abstract

PURPOSE
The purpose of this study was to derive and compare the inherent color (hue angle, chroma), translucency (TP(SCI)), surface gloss (ΔE* SCE-SCI), and surface roughness (Ra) amongst selected shades and brands of three hybrid CAD/CAM blocks [GC Cerasmart (CS); Lava Ultimate (LU); Vita Enamic (VE)].
MATERIALS AND METHODS
The specimens (N = 225) were prepared into square-shaped (12 × 12 mm2) with different thicknesses and shades. The measurements of color, translucency, and surface gloss were performed by a reflection spectrophotometer. The surface roughness and surface topography were assessed by white light interferometry.
RESULTS
Results revealed that hue and chroma values were influenced by the material type, material shade, and material thickness (P < .001). The order of hue angle amongst the materials was LU > CS > VE, whereas the order of chroma was VE > CS > LU. TP(SCI) results demonstrated a significant difference in terms of material types and material thicknesses (P ≤ .001). TP(SCI) values of the tested materials were ordered as LU > CS > VE. ΔE* SCE-SCI and Ra results were significantly varied amongst the materials (P < .001) and amongst the shades (P < .05). The order of ΔE* SCE-SCI amongst the materials were as follows LU > VE ≥ CS, whereas the order of Ra was CS ≥ VE > LU.
CONCLUSION
Nano-ceramic and polymer-infiltrated-feldspathic ceramic-network CAD/CAM materials exhibited different optical, inherent color and surface parameters.

Keyword

Hybrid ceramics; Hue; Chroma; Translucency; Surface roughness

MeSH Terms

Interferometry

Figure

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  Fig. 1 The visible (400 – 700 nm) reflectance spectra for tested specimens illustrating variations in their reflectance.

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  Fig. 2 Hue angle (hab*), chroma (Cab*), and translucency (TPSCI) comparison according to the mean value and standard deviation of the tested materials in each shade and thickness. Different lower case letters indicate statistical difference inside the respective group (P < .05).

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  Fig. 3 Representative white light interferometer microscope images of tested CAD/CAM materials with 1 mm thicknesses in each selected shade. All images were taken at ×50 magnification.

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  Fig. 4 Representative SEM images of tested CAD/CAM materials with 2 mm thicknesses in A1-HT/1M1-HT shade. The specimens were polished with metallographic SiC papers (FEPA #800, 1200, 2400, 4000). The images were taken at ×500 magnification.

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