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ORIGINAL ARTICLE
Year : 2018  |  Volume : 15  |  Issue : 1  |  Page : 7-13

Flexural strength of four-unit implant-supported ceramic veneered zircon and full zircon fixed dental prosthesis


1 Ministry of Health, Faculty of Dentistry, Tanta University, Tanta, Egypt
2 Department of Fixed Prosthodontics, Faculty of Dentistry, Tanta University, Tanta, Egypt

Correspondence Address:
Ayatalla A Bedair
Ministry of Health, Tanta
Egypt
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/tdj.tdj_29_17

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Purpose To investigate the flexural strength and the fracture loads of bilayered and monolithic zirconia fixed dental prostheses (FDPs). Materials and methods For flexural strength test, two groups of bar-shaped (25 × 5 × 2 mm3) monolithic zirconia (n = 5) and bilayered zirconia–porcelain (n = 5) specimens were prepared using computer-aided design and manufacture system for zirconia and hand layering for porcelain. Flexural strength test was performed using universal testing machine at cross-head speed of 1 mm/min. For fracture resistance test, 20 master models composed of two implant analogues and their corresponding titanium implant abutments embedded vertically in autopolymerizing acrylic resin blocks to mimic clinical conditions for a four-unit FDPs. Twenty FDPs were fabricated and divided into two groups (n = 10): group A, bilayered zirconia four-unit implant-supported FDPs; group B, monolithic zirconia four-unit implant-supported FDPs. Samples in each group were cemented to their corresponding model and then underwent artificial ageing by thermocycling of 5000/cycle. The fracture resistance test was done using universal testing machine at cross-head speed of 1 mm/min. Statistical analysis of the results and comparison between each two groups were performed using independent t-test (significance: P ≤ 0.05). Results Monolithic zirconia group recorded statistically significant higher flexural strength and fracture resistance compared to bilayered group. Conclusion Strength of monolithic zirconia is significantly higher than bilayered zirconia.


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