Advisory Committee Chair
Advisory Committee Members
Date of Award
Degree Name by School
Master of Science (MS) School of Dentistry
Statement of Problem: With the recent advent of translucent and ultra-translucent zirconia, it is unknown if this type of high-strength ceramic restoration requires adhesive cementation to enhance retention as well as the effect of surface treatment thus its clinical applicability requires further investigation. Purpose: To investigate the difference in fracture strength of translucent zirconia (5Y-Z) using different crown thickness, different cements under different surface treatment conditions. Materials and Methods: The experimental design consisted of five groups of 30 specimens each. Two different cements were utilized under different surface treatment conditions. Copings of (1.0 mm) uniform thickness were milled of 3Y-zirconia (Katana HTML shade A1 (Kuraray Noritake Dental) -control group- then assigned to three subgroups (n = 10). The first subgroup was luted to resin composite dies using (Rely X Luting; 3M ESPE), the second subgroup was alumina particle abraded then luted with (Rely X Luting; 3M ESPE) and the third subgroup was alumina particle abraded and cemented using (Panavia SA Cement universal, Kuraray).In addition ,10 copings of lithium disilicate (1.0mm ) uniform thickness were milled from HT IPS e.max CAD (Ivoclar Vivadent, Schaan, Liechtenstein) as a control group ,they were surface treated and cemented using (Panavia SA Cement universal, Kuraray). Copings of 5Y-zirconia, with iv uniform thickness of 0.8 mm, 1.0 mm, 1.25 mm respectively were assigned into other 3 subgroups for each thickness (n=10) and copings were treated identically to the 3Y- Zirconia control group. All specimens were then stored in distilled H2O at 24°C for 24 hours prior to testing. They were load cycled with Instron 5565 mechanical testing system (100,000 cycles, 100 N force) and then loaded with a steel indenter until failure. Failure mode was visually evaluated. Results: Fracture load was significantly different for materials, cements, and surface abrasion (p < 0.05). 3Y-TZP coping luted with resin showed the highest fracture load in the 3Y-Zirconia group .However ,5Y-PSZ copings (1.25 mm thickness) luted with resin showed the highest fracture load compared with RMGI (p < 0.001) in the 5Y-PSZ groups , there was a significant difference in fracture load between 5Y-PSZ (1.0 mm thickness) and lithium disilicate luted with resin , whereas 5Y-PSZ (0.8mm thickness ) had the lowest fracture load with no significant difference of cement or surface treatment applied .A significant difference was observed in the 5Y-PSZ copings (1.25 mm thickness ) when surface abraded prior to luting with RMGI. Conclusion: Within the limits of this study, Fracture strength of 5Y-PSZ increased as thickness increase. All specimens in this study benefited from using resin cement regardless of type of ceramic material. Airborne particle abrasion decreased the fracture strength of 5Y-PSZ when luted with RMGI but may be applied when luted with resin cement.
Elamin, Esra, "The Difference in Fracture Strength of Translucent Zirconia (5Y-Z) Using Different Cements and Surface Treatments" (2022). All ETDs from UAB. 122.