Abstract
As the proportion of adult orthodontic treatment increases, mainly for aesthetic reasons, orthodontic brackets are directly attached to yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) restorations. This, study analyzed the shear bond strength (SBS) between various surface treated Y-TZP and orthodontic metal brackets. The Y-TZP specimens were conditioned by 110 μm Al2O3 sandblasting, or sandblasting followed by coating with one of the primers (silane, MDP, or an MDP-containing silane primer). After surface treatment, the orthodontic metal bracket was bonded to the specimen using a resin cement, and then 24 h storage in water and thermal cycling (5000 cycles, 5–55 °C), SBS was measured. Surface roughness was analyzed for surface morphology, and X-ray photoelectron spectroscopy (XPS) was employed for characterization of the chemical bond between the Y-TZP and the MDP-based primers (MDP, MDP containing silane primer). It was found that after surface treatment, the surface roughness of all groups increased. The groups treated with 110 μm Al2O3 sandblasting and MDP, or MDP-containing silane primer showed the highest SBS values, at 11.92 ± 1.51 MPa and 13.36 ± 2.31 MPa, respectively. The SBS values significantly decreased in all the groups after thermal cycling. Results from XPS analysis demonstrated the presence of chemical bonds between Y-TZP and MDP. Thus, the application of MDP-based primers after Al2O3 sandblasting enhances the resin bond strength between Y-TZP and the orthodontic metal bracket. However, bonding durability of all the surface-treated groups decreased after thermal cycling.
Highlights
Several studies have reported the importance of the bond strength between yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) ceramics and resin cement [1,2,3,4,5]
Comparing the groups after thermal cycling, it was found that there was no significant difference between PT, AT, and AST, or between
We examined the application of silane, methacryloyloxydecyl dihydrogen phosphate (MDP), and MDP containing silane primers, to 110 μm Al2 O3 sandblasted Y-TZP ceramic to study the effects of these primers on the shear bond strength with an orthodontic metal bracket
Summary
Several studies have reported the importance of the bond strength between yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) ceramics and resin cement [1,2,3,4,5]. Excellent biocompatibility and superior mechanical properties, Y-TZP-based restoratives are widely used in dental clinics [6,7,8,9]. With the introduction of CAD (computer-aided design)/CAM (computer-aided manufacturing) methods for the production of dental restoratives, the designing of teeth shapes has become more refined. It has been possible to reduce the production time of restoratives and the frequency of patient visits to dental clinics [10,11]. Y-TZP based full-contour all zirconia crowns and bridges have been widely utilized [12,13]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
