Effect of Titanium-Base Abutment Height on Optical Properties of Monolithic Anterior Zirconia Crowns

Ameer Biadsee*, Mutlu Özcan, Lubaba Masarwa, Mishel Haddad, Nadin Al Haj Husain, Zeev Ormianer

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


The effects of different heights of ti-base abutments on the color of anterior screw-retained zirconia restorations fabricated using computer-aided design and computer-aided manufacturing (CAD-CAM) technologies may affect the optical clinical outcome. The purpose of this study was to measure and compare the color parameters of zirconia crowns in different shades on ti-base abutments. Identical specimens (N = 160) were milled to restore the screw-retained central maxillary incisor crown, using 5% mol yttria zirconia (5Y-TZP). The specimens were designed using computer design software to match 3.5 mm and 5.5-mm ti-base abutments and milled using one CAD-CAM technology. Specimens were divided into four main groups depending on zirconia shade (A1/0, A2/3, A3.5/4 and B2/3) and then assigned to two subgroups according to ti-base height. Color measurements in the CIELab coordinates were made using a spectrophotometer under room-light conditions. Color difference (ΔE*) values were calculated using the CIE76 and CIEDE2000 formula. Within the group of A0/1 and A2/3, for 5.5 mm abutment height, a significant difference was found between the means of colors ∆E00 and ∆Eab (p < 0.01). Using a 5.5 mm-height ti-base abutment may produce a clinically unacceptable outcome (ΔEab > 2) in A1/0 and A2/3 color groups.

Original languageEnglish
Article number7643
Issue number21
StatePublished - Nov 2022


  • colour
  • dental
  • dental materials
  • monolithic zirconia
  • optical properties
  • prosthetic dentistry
  • titanium-base abutment


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