Does the prosthesis weight matter? 3D finite element analysis of a fixed implant-supported prosthesis at different weights and implant numbers

Abstract

PURPOSE. This study evaluated the influence of prosthesis weight and number of implants on the bone tissue microstrain. MATERIALS AND METHODS. Fifteen (15) fixed full-arch implant-supported prosthesis designs were created using a modeling software with different numbers of implants (4, 6, or 8) and prosthesis weights (10, 15, 20, 40, or 60 g). Each solid was imported to the computer aided engineering software and tetrahedral elements formed the mesh. The material properties were assigned to each solid with isotropic and homogeneous behavior. The friction coefficient was set as 0.3 between all the metallic interfaces, 0.65 for the cortical bone-implant interface, and 0.77 for the cancellous bone-implant interface. The standard earth gravity was defined along the Z-axis and the bone was fixed. The resulting equivalent strain was assumed as failure criteria. RESULTS. The prosthesis weight was related to the bone strain. The more implants installed, the less the amount of strain generated in the bone. The most critical situation was the use of a 60 g prosthesis supported by 4 implants with the largest calculated magnitude of 39.9 mm/mm, thereby suggesting that there was no group able to induce bone remodeling simply due to the prosthesis weight. CONCLUSION. Heavier prostheses under the effect of gravity force are related to more strain being generated around the implants. Installing more implants to support the prosthesis enables attenuating the effects observed in the bone. The simulated prostheses were not able to generate harmful values of peri-implant bone strain.

Stress distribution on different bar materials in implant-retained palatal obturator

“…The 3D volumetric model of the bone was then finished based on the surface created by the curve network manually generated ( Fig 2A ). The cortical bone ( Fig 2E ) contained 1 mm thickness in juxtaposition with cancellous bone ( Fig 2D ) [ 33 ]. The command offset surface was used to create the soft tissue with 2 mm thickness [ 34 ] ( Fig 2F ).…”

“…The platform had a diameter of 4.1 mm, similar to a regular conventional implant. The external hexagon was extruded (0.7 mm high) and attached to the previously created cylindrical body [ 33 ] ( Fig 2H ). The minimum distance between the implants was 4 mm ( Fig 2G ).…”

“…After that, the full-arch total prosthesis was modeled containing artificial teeth [ 33 ] and palatal coverage ( Fig 2J ). The clip connector for the fixture system was modeled in the same position as the bar from the framework.…”

Influence of fibromucosa height and loading on the stress distribution of a total prosthesis: a finite element analysis

“…In turn, the study of Ogawa et al [14] analyzed the retention force of muco-supported prostheses in three distinct regions, advocating the use of in silico method for retention force tests. In spite of this wide use of theoretical analyzes for evaluating total prostheses, the results of the present study should be carefully extrapolated, since the variation in temperature and pH, biofilm, diet, hygiene and prosthesis weight [33] were not simulated and may influence the results found in this investigation.…”

Impact of the Stress Status of Employees on the Enterprise Technology Management Cost Through Matter-Element Analysis Under Psychological Health Education

“…As an interdisciplinary subject of thinking science, system science, and mathematics (Zabukovšek et al, 2019), it can solve incompatible problems. The matter-element analysis can rank and sort the factors influencing technical management cost of construction enterprises, so as to control technical management cost effectively (Tribst et al, 2020). This study adopted the matter-element analysis to explore the related factors influencing technology management cost of construction enterprises.…”