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

• Published in: Materials Vol. 15; no. 21; p. 7643
• Main Authors: Biadsee, Ameer, Özcan, Mutlu, Masarwa, Lubaba, Haddad, Mishel, Al-Haj Husain, Nadin, Ormianer, Zeev
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 31.10.2022; MDPI
• Subjects: Aesthetics; CAD; CAD/CAM; CAM; Cement; Color; colour; Computer aided design; Computer aided manufacturing; Computer design; Crowns (Dentistry); dental; Dental crowns; dental materials; Dental research; Hypotheses; Implant dentures; Materials; Mathematical analysis; Methods; monolithic zirconia; Optical properties; Prostheses; prosthetic dentistry; Shades; Software; Standard deviation; Subgroups; Titanium; Titanium products; Variables; Yttrium oxide; Zirconium dioxide; Zirconium oxide; Israel; Basel Switzerland; Switzerland; Japan; Germany; titanium-base abutment; colour; monolithic zirconia; optical properties; dental; dental materials; prosthetic dentistry
• ISSN: 1996-1944; 1996-1944
• DOI: 10.3390/ma15217643

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.