الفهرس 
AbstractOnly 14 pages are availabe for public view
 |  | from | 148 |  |  |
| | | from | 148 | | |
Abstract
Introduction: Primer application has a dual action. As it proved effectiveness as (chemical surface treatment method of zirconia ceramic) in comparison with airborne particle abrasion (micromechanical surface treatment method). The Aim of this study: The aim of this in-vitro study was to evaluate the effect of cleaning methods and primer application on bonding to contaminated zirconia. Materials and methods: A total of 64 zirconia discs (8mm × 3mm) were fabricated with CAD/CAM. All discs were air-borne particle abraded using 50 μm Al2O3 particles then divided into two main group: A.(control test groups) (n= 16) and B.(contaminated test groups(n=48) that were divided into three main test groups(n=16) according to cleaning methods after contamination) as follow ; [steam cleaning (SC), ultrasonic cleaning (UC), Ivoclean cleaning (IC)]. Then, each main group was subdivided into two equal subgroups (n=8) according to primer application (Monobond N) or no primer application (NP). Composite resin discs (Nexcomp) were cemented to zirconia discs using adhesive resin cement ( Multilink N). All bonded specimens were stored in water bath for 6 months. Shear bond strength (SBS) test was performed afterwards using a universal testing machine. Scanning Electron Microscope was used for failure mode examination. Results: : The statistical analyses were done using two-way ANOVA and serial one way ANOVAs followed by Post Hoc Tukey-HSD test at (p≤ 0.05). The application of primer significantly increased SBS values of test groups compared to non primed ones (p=0.000). The highest mean SBS (MPa) was reported for (ICP) test group (15.3±1.6 MPa) followed by (UCP) test group (11.1±2.9MPa). While the lowest mean SBS was observed for (CP) (9.5 ±3.3 MPa). There was statistically significant difference between (ICP) and other test groups (CP, SCP, UCP) (p=0.001, p=0.032, p=0.017) respectively. There was no statistically significant difference between cleaning test groups without primer application.