STRESS DISTRIBTUION ANALYSIS FOR THE MANDIBULAR SCREW-RETAINED FULL ARCH ACRYLIC PROSTHESIS WITH DIFFERENT CANTILEVER EXTENSION (3D FINITE ELEMENT ANALYSIS)

Document Type : Original Article

Authors

1 Dental Specialist, Ministry of Health.

2 Lecturer of Prosthodontics, Faculty of Dentistry, Cairo University.

3 Professor of Prosthodontics, Faculty of Dentistry, Cairo University

Abstract

Background: Implant-retained restorations offer numerous advantages over regular removable dentures. Basically, efficient retention and stability is easily achieved by constructing a fixed restoration or at least by using overdenture attachments instead of depending on the weak physical means used with regular dentures. Methods: A geometrical model demonstrating screw retained acrylic fixed restoration, mucosa, implants, abutment, screw, alveolar bones were generated to accomplish the assessments. The parameters presented in the computer model were cantilever extent and stresses with 50 and 100 N performed to mimic the occlusal stresses. geometrics with the peripheries of stress were gained and the extreme stress at each site was designed in diagrams for analysis. Results: Stresses clustered at the elements closest to the loading point. implant deformation shows a reduction with the increase of cantilever length. Conclusion: Alveolar bone received less stresses and deformation under more rigid restoration that it distributes the applied load in a good manner than lower rigidity one.

Keywords

Egyptian Dental Journal
Volume 67, Issue 2 - Serial Number 4
April (Fixed Prosthodontics, Removable Prosthodontics and Dental Materials)
April 2021
Pages 1517-1525

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