3D Finite Element Study on: Bar Splinted Implants Supporting Partial Denture in the Reconstructed Mandible

El-Anwar, Mohamed I.; Ghali, Rami; Aboelnagga, Mona

doi:10.3889/oamjms.2016.027

Cited by 5 publications

(6 citation statements)

References 32 publications

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“…It seems, therefore, that the risk of loosening or even damage to these elements is greater than the disintegration of the implant or peri-implantitis [ 40 , 41 ]. The conducted research confirmed the reports of other authors that the greatest load occurs in the distal parts of the bar retention [ 42 , 43 ]. Stress concentration, however, within the clips results from their shape.…”

Section: Discussionsupporting

confidence: 89%

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A Comparison of Biomechanical Properties of Implant-Retained Overdenture Based on Precision Attachment Type

et al. 2021

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This paper aims to compare, in vitro, the biomechanical properties of an overdenture retained by two bar-retained implants and an overdenture retained by two bar-retained implants with ball attachments. An edentulous mandible model was prepared for the study based on the FRASACO mold with two implants. In the first system, the “rider” type (PRECI-HORIX, CEKA) retention structure and the complete mandibular denture with the matrix were made. In the second system, the “rider” type retention suprastructure was also used. In the distal part, (CEKA) clips were placed symmetrically, and a complete mandibular denture, together with the matrix on the bar, and the clip patrices were made. A numerical model was developed for each system where all elements were positioned and related to geometric relations, as in reality. The FEA analysis (finite element analysis) was carried out for seven types of loads: with vertical forces of 20, 50, and 100 N and oblique forces of 20 and 50 N acting on individual teeth of the denture, namely central incisor, canine, and first molar. Displacements, stresses, and deformations within the systems were investigated. Maximum denture displacement in the first system was 0.7 mm. Maximum bar stress amounted to 27.528 MPa, and implant stress to 23.16 MPa. Maximum denture displacement in the second system was 0.6 mm. Maximum bar stress amounted to 578.6 MPa, that of clips was 136.99 MPa, and that of implants was 51.418 MPa. Clips cause smaller displacement of the overdenture when it is loaded but generate higher stress within the precision elements and implants compared to a denture retained only by a bar. Regardless of the shape of the precision element, small deformations occur that mainly affect the mucosa and the matrix.

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Section: Discussionsupporting

confidence: 89%

“…The studies presented in this paper show the interdisciplinary character of today’s prosthetics. FEA is applied by a growing number of researchers [ 24 , 38 , 43 , 46 ]. Advances in virtual engineering enable making computer simulations in concrete and stable conditions, which helps avoid mistakes in experimental studies.…”

Section: Discussionmentioning

confidence: 99%

A Comparison of Biomechanical Properties of Implant-Retained Overdenture Based on Precision Attachment Type

et al. 2021

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“…The distribution of the loads and stresses in dental structures attached to the jaw with the help of implants has been studied in many works, and general approaches to such problems can be divided into three global areas. The first direction is based on analytical methods [ 75 , 76 , 77 , 78 , 79 ], the works of the second direction are based on the finite element method and the setting of a virtual experiment [ 80 , 81 , 82 , 83 , 84 ], and the third direction uses the means of model and field experiments [ 85 , 86 , 87 , 88 , 89 ]. Our article develops the first analytical line of research.…”

Section: Discussionmentioning

confidence: 99%

Analytical Modeling of the Interaction of a Four Implant-Supported Overdenture with Bone Tissue

et al. 2022

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Today, an interdisciplinary approach to solving the problems of implantology is key to the effective use of intraosseous dental implantations. The functional properties of restoration structures for the dentition depend significantly on the mechanical stresses that occur in the structural elements and bone tissues in response to mastication loads. An orthopedic design with a bar fixation system connected to implants may be considered to restore an edentulous mandible using an overdenture. In this study, the problem of the mechanics of a complete overdenture based on a bar and four implants was formulated. A mathematical model of the interaction between the orthopedic structure and jawbone was developed, and a methodology was established for the analytical study of the stress state of the implants and adjacent bone tissue under the action of a chewing load. The novelty of the proposed model is that it operates with the minimum possible set of input data and provides adequate estimates of the most significant output parameters that are necessary for practical application. The obtained analytical results are illustrated by two examples of calculating the equivalent stresses in implants and the peri-implant tissue for real overdenture designs. To carry out the final assessment of the strength of the implants and bone, the prosthesis was loaded with mastication loads of different localization. In particular, the possibilities of loading the prosthesis in the area of the sixth and seventh teeth were investigated. Recommendations on the configuration of the distal cantilever of the overdenture and the acceptable level and distribution of the mastication load are presented. It was determined that, from a mechanical point of view, the considered orthopedic systems are capable of providing long-term success if they are used in accordance with established restrictions and recommendations.

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“…Bar attachment was the one of choice in this study. It was stated that dental implants allow better stress distribution and less prosthetic maintenance in comparison to non-splinted implants (9) . Cone beam radiograph was used to assess alveolar bone height and its loss around implants.…”

Section: Discussionmentioning

confidence: 99%

The effect of two different bar materials constructed with CAD/CAM technology on implant retained mandibular overdentures: radiographic evaluation.

Abdelkader

Talaat

Nawar

et al. 2021

Ain Shams Dental Journal

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Background: Implant supported overdentures are a widely-accepted treatment approach with long-term effectiveness for restoring function and aesthetics, as well as improving masticatory efficiency and individual satisfaction. Recently, Computer aided design-Computer aided manufacturing (CAD/CAM) fabricated bars are increasingly used providing high stability levels, a stress-free fit, and high precision level. Objective: to evaluate the crestal bone height surrounding the implants in implant-supported mandibular overdentures retained with CAD/CAM milled Co-Cr and PEEK bar attachments using CBCT. Materials and Methods: Twenty completely edentulous patients were selected from the outpatient clinic, Prosthodontic Department, Faculty of Dentistry, Ain Shams University. They were classified into two groups: Group I: Ten patients received CAD/CAM milled Co-Cr bar supporting implant mandibular overdenture. Group II: Ten patients received CAD/CAM milled PEEK bar supporting implant mandibular overdenture. Radiographic evaluation using CBCT was carried out at insertion time, six months, and twelve months after loading to evaluate the marginal bone height changes around the implants in both groups. Results: Statistical analysis of the data revealed significant increase in the amount of bone loss around the implants for group I (Co-Cr) compared to group II (PEEK) during the one year follow-up period. Conclusion:The use of CAD/CAM milled Co-Cr and PEEK bar attachments to support implant mandibular overdenture meets the implant success criteria based on clinical and radiological findings after one year. However, CAD/CAM milled PEEK bar may be advantageous than CAD/CAM milled Co-Cr bar in terms of reduced bone loss.

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3D Finite Element Study on: Bar Splinted Implants Supporting Partial Denture in the Reconstructed Mandible

Cited by 5 publications

References 32 publications

A Comparison of Biomechanical Properties of Implant-Retained Overdenture Based on Precision Attachment Type

A Comparison of Biomechanical Properties of Implant-Retained Overdenture Based on Precision Attachment Type

Analytical Modeling of the Interaction of a Four Implant-Supported Overdenture with Bone Tissue

The effect of two different bar materials constructed with CAD/CAM technology on implant retained mandibular overdentures: radiographic evaluation.

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