Fusion sputtering for bonding to zirconia-based materials.
OBJECTIVE
To evaluate the influence of fusion sputtering on zirconia-resin microtensile bond strength after 6 months of water storage.


METHODS
Zirconia disks received one of the following surface treatments: particle abrasion with 50-µm aluminum oxide particles or fusion sputtering, while as-sintered specimens served as a control. The prepared zirconia disks (Lava Zirconia) were bonded to pre-aged composite disks (Filtek Z250) using a phosphatemonomer- containing resin cement (RelyX Unicem), and the bonded specimens were sectioned into micro-bars (1 x 1 x 6 mm) which were either immediately tested or after 6 months of water storage (n = 25). Scanning electron microscopy (SEM) and surface roughness were performed for the prepared specimens. Data were analyzed using two-way ANOVA (α = 0.05).


RESULTS
Particle abrasion (33.1 MPa) and fusion sputtering (42.5 MPa) produced significantly higher MTBS values and resisted degradation after 6 months of water storage, while as-sintered specimens (12.4 MPa) demonstrated a significant reduction in bond strength after water storage (2.9 MPa). SEM examination indicated that fusion sputtering resulted in the creation of retentive zirconia beads on the treated surface, which enhanced micromechanical retention with adhesive resin and prevented interfacial failure.


CONCLUSIONS
Fusion sputtering is a new and a simple method suitable for enhancing the bond strength of adhesive resins to zirconia-based frameworks.
Dental Biomaterials Department, Faculty of Dentistry, Alexandria University, Egypt. Info@aboushelib.org
Moustafa N
MN
Aboushelib
D000268:Adhesiveness; D000537:Aluminum Oxide / Q000737:chemistry; D055598:Chemical Phenomena; D003188:Composite Resins / Q000737:chemistry; D001840:Dental Bonding / Q000379:methods*; D045662:Dental Etching / Q000379:methods; D003764:Dental Materials / Q000737:chemistry*; D003799:Dental Stress Analysis / Q000295:instrumentation; D006358:Hot Temperature; D006801:Humans; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D010316:Particle Size; D011312:Pressure; D019279:Resin Cements / Q000737:chemistry; D013314:Stress, Mechanical; D013499:Surface Properties; D013718:Tensile Strength; D013997:Time Factors; D014867:Water / Q000737:chemistry; D015040:Zirconium / Q000737:chemistry*
D003188:Composite Resins; D003764:Dental Materials; C444701:Filtek Z250; C483701:Rely X Unicem; D019279:Resin Cements; D014867:Water; D015040:Zirconium; D000537:Aluminum Oxide; C028541:zirconium oxide