Browsing by Author "El-Anwar, Mohamed I"

Filter results by typing the first few letters
Now showing 1 - 2 of 2
  • Thumbnail Image
    Item
    Influence of a V-shaped palatal vault on denture base materials’ characteristics: a finite element analysis
    (Wolters Kluwer, 12/01/2016) Moussa, Amani R; El-Gabry, Hisham S; El-Zawahry, Mohamed M; El-Anwar, Mohamed I
    Objectives In this study, the influence of a V-shaped palatal vault on the characteristics of denture base materials was studied. Materials and methods A finite element model was especially developed for this study with an average denture base thicknesses of 2 mm. Three different denture base materials were investigated under 100 N vertical and oblique loading. A linear static analysis was carried out. Results Finite element analysis showed a very low level of bone Von Mises stress under vertical loading, which means that three denture base materials and mucosa distributed the applied load and absorbed its energy perfectly, whereas mucosa was negligibly affected by changing denture base material and showed low/safe levels of stresses. Conclusion The V-shaped palatal vault affects denture base materials that, with a reduction in rigidity, will increase the mucosa-induced stress levels. Thus, denture base material selection requires a compromise between flexibility and durability
  • Thumbnail Image
    Item
    New dental implant selection criterion based on implant design
    (Dental Investigations Society, 2017-04) El-Anwar, Mohamed I; Ibraheem, Eman M; El-Zawahry, Mohamed M; Zakaria Nassani, Mohammad; ElGabry, Hisham
    Objective: A comparative study between threaded and plain dental implant designs was performed to find out a new criterion for dental implant selection. Materials and Methods: Several dental implant designs with a systematic increase in diameter and length were positioned in a cylindrical-shaped bone section and analyzed using finite element method. Four loading types were tested on different dental implant designs; tension of 50 N, compression of 100 N, bending of 20 N, and torque of 2 Nm, to derive design curves. Results: Better stress distribution on both spongy and cortical bone was noted with an increase in dental implant diameter and length. With the increase in dental implant side area, a stress reduction in the surrounding bones was observed, where threaded dental implants showed better behavior over the plain ones. Conclusions: Increasing value of ratio between dental implant side area and its cross-sectional area reduces stresses transferred to cortical and spongy bones. The use of implants with higher ratio of side area to cross-section area, especially with weak jaw bone, is recommended.