Browsing by Author "Mahrous, Aliaa"

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    THE EFFECT OF ATMOSPHERIC PLASMA-SPRAYED PEEK IMPLANTS ON OSSEOINTEGRATION
    (EDJ, 2018-01) Mahrous, Aliaa; Mohamed, Samah; Ahmed, Alshaimaa
    Objectives: The study evaluated the osseointegration of atmospheric plasma treated PEEK implant surfaces versus the untreated PEEK surfaces. Material & Methods: The PEEK implants were milled using carbon reinforced PEEK material with CAD-CAM milling machine. The implants were placed in 6 male mongrel dogs, each dog received 2 groups of PEEK implants. The control group consisted of untreated surface PEEK implants. The study group consisted of atmospheric plasma-sprayed PEEK implants. the implants were placed in the dog femur. After 12 weeks, the animals were sacrificed, and bone- implant sections were obtained for histological evaluations and bone-to-implant contact. Electron microscope scanning was performed to assess the topography of the surface of treated and untreated PEEK implant surface. Results: Qualitative evaluation of the stained histological sections of the PEEK implants demonstrated a well distributed bone in proximity to the atmospheric plasma-sprayed PEEK implant surface after 12 weeks of placements. The bone-to-implant contact showed a significant difference (P < 0.001) between treated and untreated PEEK implant surface. Conclusions: Within the limitation of the present study, it is concluded that the atmospheric plasma-sprayed surface treatment may improve the osseointegration of PEEK implant.
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    The Performance of Abutment Material and Finish Line Configuration on the Stress Distribution and Fracture Resistance of Implant-Supported Zirconia Fixed Partial Dentures When Loaded in a Bio-Faithful Model
    (QUINTESSENCE PUBLISHING CO INC, 4350 CHANDLER DRIVE, HANOVER PARK, IL 60133 USA, 2021-12) Radwan, Mohamed M; Shabban, A A; Elshafey, Donia; Mahrous, Aliaa
    This computational study analyzed the strain magnitude and distribution within trabecular bone structure around different materials and finish line (FL) configurations of implant abutments loaded axially. Differences in fracture resistance of these abutments were also assessed. Sixteen endosseous screw vent implants were embedded in eight bio-faithful mandibular simulators resembling D2 and D3 bone density (n = 4 models per bone type) in the second premolar and second molar positions. These models were further subdivided into eight subgroups with different FL configurations and abutment materials. Strain gauges were mounted adjacent to the implants, and the superstructures were successively placed on the abutments. A universal dynamometrical testing apparatus was used for a static compression load. Finally, all samples were subjected to load until fracture. Three-way analysis of variance for strain analysis showed a significant overall interaction between the three variables (bone type, FL configuration, and abutment materials; P < .001), while the analysis for fracture resistance showed significant two-way interactions between bone type and FL configuration (P < .001) and between bone type and abutment material (P < .001). The implant abutment material, the FL configuration of the abutment, and the bone type can influence the mechanical behavior of the abutment used. Zirconia abutments with anatomical FL configurations possess better fracture resistance than zirconia and titanium abutments with circular FL configurations in D2 bone density. Int J Periodontics Restorative Dent.