EL-Hawary, Y. (2024). Effect of Digital Blocking of Reversed Tapered Preparations in Comparison to Conventional Wax Blocking on Fracture Resistance of Monolithic Zirconia Crowns .. Journal of Fundamental and Clinical Research, 4(1), 68-83. doi: 10.21608/jfcr.2024.248239.1062
Yara EL-Hawary. "Effect of Digital Blocking of Reversed Tapered Preparations in Comparison to Conventional Wax Blocking on Fracture Resistance of Monolithic Zirconia Crowns .". Journal of Fundamental and Clinical Research, 4, 1, 2024, 68-83. doi: 10.21608/jfcr.2024.248239.1062
EL-Hawary, Y. (2024). 'Effect of Digital Blocking of Reversed Tapered Preparations in Comparison to Conventional Wax Blocking on Fracture Resistance of Monolithic Zirconia Crowns .', Journal of Fundamental and Clinical Research, 4(1), pp. 68-83. doi: 10.21608/jfcr.2024.248239.1062
EL-Hawary, Y. Effect of Digital Blocking of Reversed Tapered Preparations in Comparison to Conventional Wax Blocking on Fracture Resistance of Monolithic Zirconia Crowns .. Journal of Fundamental and Clinical Research, 2024; 4(1): 68-83. doi: 10.21608/jfcr.2024.248239.1062
Effect of Digital Blocking of Reversed Tapered Preparations in Comparison to Conventional Wax Blocking on Fracture Resistance of Monolithic Zirconia Crowns .
Background: Intra-oral digital scanning can correctly capture single abutment tooth preparations, and the CAD software's algorithms can manage to design restoration for reversed tapered abutment. Aim: The purpose of this in vitro study was to assess the fracture resistance of CAD/CAM zirconia crowns made on reverse-tapered preparations with two different blocking techniques. Materials and methods: Thirty dies were 3D printed using SolidWorks software. Blocking reverse taper preparation, was done with two different blocking techniques, conventional wax blocking and digital blocking . Group II (B) (-4 TOC) n=5 and group III (D) (-8 TOC) n=5 underwent conventional wax blocking, Group II (C) (-4 TOC) n=5 and group III (E) (-8 TOC) n=5 used the software's algorithms (EXO-CAD) to block undercuts digitally and Group I (A) (12 TOC) served as the control (n=10). Thirty dies were individually scanned, and a separate design was made for each die (Generic type), scanning was done with Cerec Omnicam intraoral scanner. Thirty CAD/CAM monolithic translucent zirconia crowns were milled with 120μm of cement space. Cementation was done using self-adhesive resin cement (Thera-Cem). Fracture test was done using universal testing machine. SEM analysis was used to identify crack origins and propagation directions, and intra and intergroup analyses were performed of fractured parts. Results: Only tapering angle had a significant effect on fracture resistance (p=0.012). Conclusion: There was no significant difference between digital or conventional blocking nor their effect on fracture resistance test, 12⸰ TOC control group showed the highest fracture resistance and -8⸰ TOC showed the least.
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