Finite element analysis on stress distribution of maxillary implant-retained overdentures depending on the Bar attachment design and palatal coverage

Kim, Min-Jeong; Hong, Sung-Ok

doi:10.4047/jap.2016.8.2.85

Cited by 10 publications

(11 citation statements)

References 22 publications

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“…Photoelasticity and finite elements are two tools which have been employed to a better understanding of the stress transfer and distribution from implants to surrounding bone [ 35 ]. In general, dental implants should be dared to distribute properly the loads with a nonexcessive concentration area, and if excessive stress is applied to bone, bone resorption can occur.…”

Section: Resultsmentioning

confidence: 99%

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A New Model to Study Fatigue in Dental Implants Based on Probabilistic Finite Elements and Cumulative Damage Model

Prados-Privado

Bea

Rojo

et al. 2017

Applied Bionics and Biomechanics

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The aim of this study was to predict the fatigue life of two different connections of a dental implant as in load transfer to bone. Two three-dimensional models were created and assembled. All models were subjected to a natural masticatory force of 118 N in the angle of 75° to the occlusal plane. All degrees of freedom in the inferior border of the cortical bone were restrained, and the mesial and distal borders of the end of the bone section were constrained. Fatigue material data and loads were assumed as random variables. Maximum principal stresses on bone were evaluated. Then, the probability of failure was obtained by the probabilistic approach. The maximum principal stress distribution predicted in the cortical and trabecular bone is 32 MPa for external connection and 39 MPa for internal connection. A mean life of 103 and 210 million cycles were obtained for external and internal connection, respectively. Probability cumulative function was also evaluated for both connection types. This stochastic model employs a cumulative damage model and probabilistic finite element method. This methodology allows the possibility of measured uncertainties and has a good precision on the results.

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Section: Resultsmentioning

confidence: 99%

“…Once FE models analyzed, the random distribution (mean and variance) of stress and strains in implants is evaluated by the probabilistic finite element method, which avoids a Monte Carlo simulation [ 35 ]. The reader is referred to Prados-Privado et al [ 28 ] for further details.…”

Section: Methodsmentioning

confidence: 99%

A New Model to Study Fatigue in Dental Implants Based on Probabilistic Finite Elements and Cumulative Damage Model

Prados-Privado

Bea

Rojo

et al. 2017

Applied Bionics and Biomechanics

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“…Apart from the material, the custom-milled framework design also influences the stress distribution [ 25 ]. In conventional maxillary overdentures that do not require palatal coverage, the stresses tend to be concentrated in the distal of the last implant, in the cantilever region [ 30 ]. However, obturator prostheses aims both coverage and adequate sealing of the oroantral communication, and thus the cantilever ceases to exist if there is residual bone on the affected side, or if zygomatic implants are installed.…”

Section: Discussionmentioning

confidence: 99%

“…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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“…Following models were studied The material properties of various materials used in the model were taken from the literature 5,6 (table 2).…”

Section: Resultsmentioning

confidence: 99%

Comparative evaluation of the effect of three different attachment systems on stress distribution patterns in two implant supported maxillary overdenture: a 3d finite element analysis

Rambhau¹,

Arun²,

SonamVinod³

et al. 2017

Int j curr adv res

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Finite element analysis on stress distribution of maxillary implant-retained overdentures depending on the Bar attachment design and palatal coverage

Cited by 10 publications

References 22 publications

A New Model to Study Fatigue in Dental Implants Based on Probabilistic Finite Elements and Cumulative Damage Model

A New Model to Study Fatigue in Dental Implants Based on Probabilistic Finite Elements and Cumulative Damage Model

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

Comparative evaluation of the effect of three different attachment systems on stress distribution patterns in two implant supported maxillary overdenture: a 3d finite element analysis

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