|Baltic Dental and Maxillofacial Journal|
December, 2020, Vol. 22, No. 4
The relationship between congenital cleft lip and palate malformation, skeletal and dental occlusal anomalies, and the infl uence of its treatment on affected patients’ oral health-related quality of life (OHRQoL)
Family nurses, oral hygiene, and educational implications: a cross-sectional study
Stress in the bone and prosthetic components due to "all-on-4" system with polyether-ether-ketone screwing prosthesis. Analysis using 3D fi nite element method
© 2021 Stomatologija
Stomatologija 2020; 22 (4): 125-8 392 KB
Stress in the bone and prosthetic components due to "all-on-4" system with polyether-ether-ketone screwing prosthesis. Analysis using 3D finite element method
Ignas Vaitiekūnas*, Justina Klimenko*, Eglė Ivanauskienė*, Juozas Žilinskas*
Objective. To identify and analyze distribution of bone stress in the implant area using a PEEK prosthesis fixed on four dental implants depending on different positions of the functional loading point on a cantilever in a 3D modeled system.
Material and methods. The fragment of the lower jaw with dental implants and over-the-implant prosthetic part was represented by geometrical 3D models and diagonal loads were placed on the distal cantilever of the prosthesis. 3D models were exported to SolidWorks® Student Edition 2018 (Dassault Systemes SE, France) software. Average von Mises stress around the outer perimeter of the implant was measured in MPa. Relative stress was identified using a graded color scale in relative units. A 0.95 confidence level (P), 0.05 significance level (p), maximum error of 10% (Δ) were set. The data was analyzed using Statistical Package for Social Sciences® (IBM, Armonk, USA) version 137.
Results. The distal implant on the same side as the point of loading receives 45.01-53.88% of all forces created. Stress at the frontal implants is distributed almost evenly. The pair of implants on the same side of the loading force suffers 66.38-74.68% of all forces. The implant on the opposite side of the loading force receives the smallest stress which is hardly influenced by the length of the console.
Conclusion. A full arch restoration in an edentulous lower jaw using a four-implant fixed PEEK prosthesis system generates unevenly distributed internal stress in the bone next to the implants but does not go over the critical resistance of the bone.
Key words: edentulous mandible treatment, dental implants, polyetheretherketone, bone stress, finite element analysis.
Received: 13 10 2019
Accepted for publishing: 21 12 2020
*Department of Prosthodontics, Faculty of Odontology, Medical Academy, Lithuanian University of Health Sciences, Kaunas, Lithuania
Address correspondence to Justina Klimenko, Department of Prosthodontics, Faculty of Odontology, Medical Academy, Lithuanian University of Health Sciences, Sukilėlių pr. 51, Kaunas, Lithuania.
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