Finite Element Study of Three Different Treatment Designs of a Mandibular Three Implant-Retained Overdenture

Shishesaz, Mohammad; Ahmadzadeh, Asadollah; Baharan, Amin

doi:10.1590/1679-78253212

Cited by 7 publications

(6 citation statements)

References 23 publications

(36 reference statements)

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“…41 This agreed with many studies. 1,41,42 Ball attachments transferred less stress to the canines and the cortical alveolar bone of the canines than resilient telescopic crowns, but transferred more stress to the cortical bone of alveolar process at the distal end of the overdenture. Ball attachment allows free movement in several directions while resilient telescopic crowns allow free vertical movement.…”

Section: Discussionsupporting

confidence: 91%

“…This can be attributed to the higher elastic modulus of the cortical bone compared with the cancellous bone. 41 This agreed with many studies. 1,41,42 Ball attachments transferred less stress to the canines and the cortical alveolar bone of the canines than resilient telescopic crowns, but transferred more stress to the cortical bone of alveolar process at the distal end of the overdenture.…”

Section: Discussionsupporting

confidence: 91%

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Finite Element Study of Stress Distribution with Tooth-Supported Mandibular Overdenture Retained by Ball Attachments or Resilient Telescopic Crowns

AL-Kordy

Al-Saadi

2022

Eur J Dent

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Objective The removable partial denture must keep health of the remaining teeth and the supporting tissues through the distribution of chewing forces on the abutment teeth and alveolar process.This study aimed to evaluate stress distribution with canines-supported mandibular overdenture retained by two different attachment types: ball attachments or resilient telescopic crowns. Materials and Methods Two 3-dimensional finite element models consisting of the cortical mandible bone, cancellous mandible bone, oral mucosa, canines, periodontal ligaments, the two attachment types, and overdenture were simulated. The models were imported into the mathematical analysis software Ansys Workbench V 15.0. All materials were considered to be homogeneous, isotropic, and linearly elastic. A vertical bilateral load of 120 N was applied to the central fossa of the first molars. The von Mises stress was calculated for canines, cortical, and cancellous bone. Results The maximum von Mises stress of the ball attachments model was 35.61, 4.28, 7.82, and 1.29 MPa for canines, cortical alveolar bone of canines, cortical alveolar bone at the distal end of the overdenture, and cancellous alveolar bone of canines, respectively. The maximum von Mises stress of the resilient telescopic crowns model was 39.22, 4.74, 7.06, and 1.05 MPa for canines, cortical alveolar bone of canines, cortical alveolar bone at the distal end of the overdenture, and cancellous alveolar bone of canines, respectively. Conclusion Resilient telescopic crowns distribute the stresses between canines, alveolar bone of canines, and overdenture supporting alveolar bone. Ball attachments transfer less stress to the canines and cortical alveolar bone of the canines, but more stress to the cancellous alveolar bone of canines and alveolar bone at distal end of the overdenture. Resilient telescopic crowns are preferred over ball attachment when the abutment teeth have good periodontal support.

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Section: Discussionsupporting

confidence: 91%

Section: Discussionsupporting

confidence: 91%

Finite Element Study of Stress Distribution with Tooth-Supported Mandibular Overdenture Retained by Ball Attachments or Resilient Telescopic Crowns

AL-Kordy

Al-Saadi

2022

Eur J Dent

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“…The assessment of biomechanical behavior can be performed through simulations to obtain pre-clinical data with bioengineering tools such as strain gauge, digital image correlation, photoelasticity and finite element analysis (FEA). The latter allows us to understand how the distribution of strain in bone tissue and stress in implants can be influenced by the restorative material [23], prosthesis and framework design [24,25], manufacturing technique [26], number and distribution of implants [27][28][29] and attachment systems [30,31]. Computer-assisted implant planning has become an important diagnostic and therapeutic tool in modern dentistry.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2020

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Implant-retained custom-milled framework enhances the stability of palatal obturator prostheses. Therefore, to evaluate the mechanical response of implant-retained obturator prostheses with bar-clip attachment and milled bars, in three different materials under two load incidences were simulated. A maxilla model which Type IIb maxillary defect received five external hexagon implants (4.1 x 10 mm). An implant-supported palatal obturator prosthesis was simulated in three different materials: polyetheretherketone (PEEK), titanium (Ti:90%, Al:6%, V:4%) and Co-Cr (Co:60.6%, Cr:31.5%, Mo:6%) alloys. The model was imported into the analysis software and divided into a mesh composed of nodes and tetrahedral elements. Each material was assumed isotropic, elastic and homogeneous and all contacts were considered ideal. The bone was fixed and the load was applied in two different regions for each material: at the palatal face (cingulum area) of the central incisors (100 N magnitude at 45°); and at the occlusal surface of the first left molar (150 N magnitude normal to the surface). The microstrain and von-Mises stress were selected as criteria for analysis. The posterior load showed a higher strain concentration in the posterior peri-implant tissue, near the load application side for cortical and cancellous bone, regardless the simulated material. The anterior load showed a lower strain concentration with reduced magnitude and more implants involving in the load dissipation. The stress peak was calculated during posterior loading, which 77.7 MPa in the prosthetic screws and 2,686 με microstrain in the cortical bone. For bone tissue and bar, the material stiffness was inversely proportional to the calculated microstrain and stress. However, for the prosthetic screws and implants the PEEK showed higher stress concentration than the other materials. PEEK showed a promising behavior for the bone tissue and for the integrity of the bar and bar-clip attachments. However, the stress concentration in the prosthetic screws may represent an increase in failure risk. The use of Co-Cr alloy can reduce the stress in the prosthetic screw; however, it increases the bone strain; while the Titanium showed an intermediate behavior.

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“…Acrylic resin 3000 0.35 [6] Cortical bone 13700 0.3 [2] Trabecular bone 1370 0.3 [2] Mucosa 680 0.45 [6] Ball abutment and metallic cap 114000 0.3 [2] Implant 110000 0.33 [15] Bar 218000 0.33 [16], [17] Clips 3000 0.28 [18] Lamella retention insert 97000 0.42 [19] Aalaei S et al…”

Section: Materials Elastic Modulus (Mpa) Poisson Ratio Referencementioning

confidence: 99%

The effect of attachment types and implant level on the stress distribution in a mandibular overdenture: a 3D Finite Element Analysis

et al. 2022

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Objective:The objective of this study was to evaluate the stress distribution in bone-surrounding implants placed in different levels in a mandibular overdenture. Material and Methods: A Computerized Tomography (CT) scan of an edentulous mandible was used to generate the models. Two implants with an internal connection were placed perpendicular to the occlusal plane in the Canine sites of the mandible. The implant in the left side was placed 1mm higher than the other side. Dolder bar and ball attachments were designed. Loading was performed by clenching the teeth with reconstruction of the muscles. In the anterior loading condition, force was applied to the central incisors and in the posterior loading conditions, it was applied to the molars and premolars. Then the Maximum Principal Stresses in the peri implant bone was evaluated with finite element analysis. Results: In both models, the highest stress values were recorded in the cortical bone surrounding the higher implant except in the ball model with unilateral load application on the right side (64.7 MPa). In almost all loading conditions the stress value differences in models with bar and ball attachments were low. Only in the anterior loading condition, the stress magnitude was higher in two implants of the ball model (60.5 MPa in the left side and 21 MPa in the right side) compared to the bar model (54.5 MPa in the left side and 17.5 MPa in the right side). Conclusion: The stress concentration did not affected considerably by the attachment system. High stress values were found adjacent the implant with a higher level. To reduce the amount of stress, bilateral balance occlusion should be considered.

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Finite Element Study of Three Different Treatment Designs of a Mandibular Three Implant-Retained Overdenture

Cited by 7 publications

References 23 publications

Finite Element Study of Stress Distribution with Tooth-Supported Mandibular Overdenture Retained by Ball Attachments or Resilient Telescopic Crowns

Finite Element Study of Stress Distribution with Tooth-Supported Mandibular Overdenture Retained by Ball Attachments or Resilient Telescopic Crowns

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

The effect of attachment types and implant level on the stress distribution in a mandibular overdenture: a 3D Finite Element Analysis

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