Zirconia bonding to titanium
Alshouibi, Ehab Nafea
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Objective: study aims to assess the bonding strength between zirconia and titanium using different types of luting cements. Also, our study aims to assess other factors that might influence cementation success and strength, which include the effect of titanium sandblasting and different cementation loads. The first aim of this study is to assess the bonding strength between zirconia and titanium using 4 resin cements that include RelyX Unicem, RelyX Unicem 2, RelyX Unicem 2 with Kuraray primer, and Multilink Automix. Second aim of this study is to evaluate the effect of sandblasting titanium, surface and how this procedure could affect the bonding strength of titanium to zirconia using the previously mentioned cements. Third aim of the study is to assess the effect of different cementation loads on the bonding strength between titanium and zirconia using all four cements. Methods: Zirconia block specimens with middle 8.2 degree tapered hole were made in the lab using Yttrium Zirconia (TZ-3YSB-E Tosoh zirconia). The fabricated zirconia speciments were made in three main stages: dry pressing, first firing stage, and second firing stage. Titanium pm Surface treatments included either no surface treatment or alumina sandblasting. Then, a cementing jig was used to standardize the cementation process of titanium pins to zirconia blocks. Titanium pins were cemented to the fabricated zirconia cylindrical blocks under three cementation loads: 1190, 2380, and 3570 grams. Manufacturer cementation protocoI was followed thoroughly and strictly for RelyX Unicem Applicap, RelyX Unicem 2 Clicker, RelyX Unicem 2 Clicker with Kuraray metal primer, and Multilink Automix cements. A pull-out test was used to assess the bond strength between zirconia and titanium substructure for the four test cements. Results: The results of this study indicate two main trends across all the experimented resin cements in this study. The first observed trend was the increase in the mean load to failure of all resin cements used to bond zirconia block to titanium pm as the cementation load increased. The second observed trend was the increase in the mean load to failure of all resin cements as the titanium pm was sandblasted, except for Rely X Unicem 2 clicker with Kuraray Metal Primer. The addition of Kuraray Metal primer to Rely X Unicem 2 clicker enhanced the bonding strength of zirconia block to the as-received titanium pin and make it comparable to the mean load to failure of the zirconia bonded to sandblasted titanium pin using the same set of resin cement. Conclusion: Resin cements are effective in bonding zirconia to titanium with an effectiveness varied from one resin cement to another. The strongest resin cement is Multilink Automix, followed by RelyX Unicem Applicap and in third place is RelyX Unicem 2 Clicker. The automixing technique and delivery was found to be a factor that enhanced the bonding strength of resin cement. Larger cementation load produced a smaller cement space, which in turn enhanced the bonding of zirconia to titanium. Sandblasted titanium surfaces showed a higher mean load to failure among all different types of resin cement compared to as-received titanium surface. However, when sandblasting the titanium surface is difficult, the use of Kuraray Metal Primer is recommended to enhance the bonding strength between Zirconia and as-received titanium surface when using RelyX Unicem 2 Clicker.
PLEASE NOTE: This work is protected by copyright. Downloading is restricted to the BU community: please click Download and log in with a valid BU account to access. If you are the author of this work and would like to make it publicly available, please contact email@example.com.Dissertation (MSD) --Boston University, Henry M. Goldman School of Dental Medicine, 2014 (Department of Restorative Sciences and Biomaterials).Includes bibliographic references: leaves 63-67.
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