TY - JOUR ID - TI - Evaluate the Flexural Strength of Zirconia Fixed Partial Denture with Different Connector Designs AU - Noor A. Abdul-Kareem AU - Ihab N. Yassen PY - 2020 VL - 7 IS - 2 SP - 32 EP - 40 JO - Journal of Oral and Dental Research مجلة طب الفم والاسنان SN - 23106417 AB - Background All-ceramic Fixed Partial Denture (FPD) restorations consisting of abutments, pontic, and connectors to link those parts together. Significantly, inappropriate connector shape reduces the restoration’s strength and makes it susceptible to fracture and affecting the biological health conditions. Objectives The purpose of the present in vitro study is to evaluate the flexural strength of all-ceramic FPD made from Yttriumstabilized zirconium oxide (Y-TZP) IPS e. Max ZirCAD, (Ivoclar Vivadent) with different connector designs. Materials and Methods the specimens were designed into a bar shape with the help of a special 3D designing program (Sketchup, 3D design software). The connector of the specimens designed with two different radii of curvature designs (Sharp of 0.3mm and Round of 0.6 mm); then, the workpiece order was transferred to the CAM milling machine. After that, the specimens were sintered according to the manufacturer’s instruction at (1500 ºC) for 6h. A universal testing machine was used for testing the flexural strength of zirconia specimens with 3 points flexural strength test with a crosshead speed of (0.5 mm/min). Data analyzed via One-way ANOVA and LSD tests performed at a significant P-value of (p ≤0.05). Results After comparing results, a highly significant difference was noticed between the control group (with no constriction) and both sharp and round groups. While there was a non-significant difference between that of the sharp and round radius of curvature groups. Conclusion Changing the connector design had a non-significant effect on the flexural strength ofthe (IPS e.max ZirCAD) FPD restoration.

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