Browsing by Author "Elsherbini, Nancy N"

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    Dislodging Force Resistance in Hemi-mandibulectomy Patients Rehabilitated with Acrylic Resin and 3D-printed Resin Prostheses
    (Jaypee Brothers Medical Publishers (P) Ltd, 2023-08) Elsherbini, Ahmed N; Alsharif, Tarek K; Elsherbini, Nancy N
    Aim: The aim of this crossover study was to compare dislodging resistance in hemi-mandibulectomy patients who had been rehabilitated with prostheses made of conventional acrylic resin (CA), conventional acrylic resin lined with a soft liner (CAS), and three-dimensional (3D)—printed resin. Materials and methods: Patients were selected with hemi-mandibulectomy class III according to the Cantor and Curtis classification. Patients had a conventional acrylic denture for the upper arch with twin occlusion. For the lower arch, the patient received a conventional acrylic denture, after 3 months it was lined with a soft liner, and after 3 months, it was retrieved and they were given a 3D-printed denture for 3 more months. Resistance to dislodging force was measured using a force gauge at insertion and after 3 months. Results: The resistance to dislodging forces was highest in the printed denture, followed by lined acrylic followed by the conventional acrylic with mean values of (3.72 ± 0.057) Newton (N), (2.696 ± 0.151) N, and (1.91 ± 0.089) N, respectively. Conclusion: Three-dimensional (3D)—printed denture bases showed the highest resistance to dislodging forces, followed by the CAS, and finally the CA. Clinical significance: Aiding patients with hemi-mandibulectomy with the best material to be used in their rehabilitation with dental prostheses. © The Author(s).
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    Stress analysis of over-denture abutments treated with two obturation techniques
    (University Library System, University of Pittsburgh, 8/18/2021) Elsherbini, Ahmed N; Nagy, Mohamed M; Elsherbini, Nancy N
    Aim: Evaluation of stresses induced on over-denture abutments endodonticaly treated with two different obturation techniques. Materials and Methods: 4 pesudo-realistic models were fabricated with two remaining canines as abutments. One canine was treated with lateral obturation technique and the other with vertical obturation. An over-denture was fabricated on the model. Then strain gauges were attached on the coronal one third of the root buccally and lingually. 50 N were applied on the middle of the model using universal testing machine and readings were collected. Results: From the collected data the lateral obturation showed 85.25±104.901 μ∈ and the vertical obturation showed 4.875±3.555 μ∈ with significance difference of P<0.05 between the groups. Conclusion: It can be concluded that the abutments treated with vertical obturation techniques reduced the stresses induced to the supporting structures when compared with the lateral condensation technique. © 2021 University Library System, University of Pittsburgh. All rights reserved.