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. 2022 Dec;14(6):346-359.
doi: 10.4047/jap.2022.14.6.346. Epub 2022 Dec 22.

Biomechanical investigation of maxillary implant-supported full-arch prostheses produced with different framework materials: a finite elements study

Mirac Berke Topcu Ersöz  1 , Emre Mumcu  1   2   3
Affiliations

Biomechanical investigation of maxillary implant-supported full-arch prostheses produced with different framework materials: a finite elements study

Mirac Berke Topcu Ersöz et al. J Adv Prosthodont. 2022 Dec.

Abstract

Purpose: Four and six implant-supported fixed full-arch prostheses with various framework materials were assessed under different loading conditions.

Materials and methods: In the edentulous maxilla, the implants were positioned in a configuration of four to six implant modalities. CoCr, Ti, ZrO2, and PEEK materials were used to produce the prosthetic structure. Using finite element stress analysis, the first molar was subjected to a 200 N axial and 45° oblique force. Stresses were measured on the bone, implants, abutment screw, abutment, and prosthetic screw. The Von Mises, maximum, and minimum principal stress values were calculated and compared.

Results: The maximum and minimum principal stresses in bone were determined as CoCr < ZrO2 < Ti < PEEK. The Von Mises stresses on the implant, implant screw, abutment, and prosthetic screws were determined as CoCr < ZrO2 < Ti < PEEK. The highest Von Mises stress was 9584.4 Mpa in PEEK material on the prosthetic screw under 4 implant-oblique loading. The highest maximum principal stress value in bone was found to be 120.89 Mpa, for PEEK in 4 implant-oblique loading.

Conclusion: For four and six implant-supported structures, and depending on the loading condition, the system accumulated different stresses. The distribution of stress was reduced in materials with a high elastic modulus. When choosing materials for implant-supported fixed prostheses, it is essential to consider both the number of implants and the mechanical and physical attributes of the framework material.

Keywords: Biomechanics; Finite element analysis; Polyetheretherketone; Titanium; Zirconia.

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Figures

Fig. 1
Fig. 1. (A) Raw image of edentulous model, (B) Six and four implant placement, (C) Implant, abutment (straight and 30° angled) and prosthetic screw, (D) Six and four implant supported framework design.
Fig. 2
Fig. 2. (A) Finite element model with mesh structure, (B) Element density in the force applied region, Definition of vertical (C) and angled (D) forces.
Fig. 3
Fig. 3. σmax, σmin values (MPa) in bone (A) and σVM values (MPa) occurring on the implant (B), abutment (C), prosthetic screw (D), implant screw (E), framework (F) and total deformation (G) under all boundary conditions on the models.
Fig. 4
Fig. 4. σmax, σmin stress maps for bone. 1: CoCr, 2: Ti, 3: ZrO2, 4: PEEK for different loading conditions.
Fig. 5
Fig. 5. σVM stress maps for implant. 1: CoCr, 2: Ti, 3: ZrO2, 4: PEEK for different loading conditions.
Fig. 6
Fig. 6. σVM stress maps for abutment. 1: CoCr, 2: Ti, 3: ZrO2, 4: PEEK for different loading conditions.
Fig. 7
Fig. 7. σVM stress maps for implant screw. 1: CoCr, 2: Ti, 3: ZrO2, 4: PEEK for different loading conditions.
Fig. 8
Fig. 8. σVM stress maps for framework and prosthetic screw. 1: CoCr, 2: Ti, 3: ZrO2, 4: PEEK for different loading conditions.
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