Stresses in implant-supported overdentures with bone resorption: a 3-D finite element analysis

Mariano, Luiz Oscar Honorato; Sartori, Evandro Afonso; Broilo, Josué Ricardo; Shinkai, Rosemary Sadami Arai; Corso, Leandro Luís; Marczak, Rogério José

doi:10.1590/s1980-65232012000100008

Cited by 7 publications

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“…The contact between implants and bone linear bonded contact was assumed representing 100% osseointegrations as expecting from delayed loading protocol 9,10,14,16. Although, sliding and movements between mucosa and denture and also between different attachment components were set to non-linear frictional contact to simulate different movements expected 26,27…”

Section: Discussionmentioning

confidence: 99%

“…All material properties were assumed linear, homogenous and isotropic to facilitate calculation process and reduce solving time. Accordingly, two values (Young's modulus and Poisson's ratio) were assigned for each part, Table 2 10,14,18,20,27…”

Section: Methodsmentioning

confidence: 99%

“…On the other hand, photoelasticity and the finite element analysis (FEA) are powerful simulation methods used in dentistry. They have enabled better understanding of stress transmission and distribution at implant-bone interface 14-16…”

Section: Introductionmentioning

confidence: 99%

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Stress-strain distribution at bone-implant interface of two splinted overdenture systems using 3D finite element analysis

Hussein

2013

J Adv Prosthodont

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PURPOSE. This study was accomplished to assess the biomechanical state of different retaining methods of bar implant-overdenture. MATERIALS AND METHODS. Two 3D finite element models were designed. The first model included implant overdenture retained by Hader-clip attachment, while the second model included two extracoronal resilient attachment (ERA) studs added distally to Hader splint bar. A non-linear frictional contact type was assumed between overdentures and mucosa to represent sliding and rotational movements among different attachment components. A 200 N was applied at the molar region unilaterally and perpendicular to the occlusal plane. Additionally, the mandible was restrained at their ramus ends. The maximum equivalent stress and strain (von Mises) were recorded and analyzed at the bone-implant interface level. RESULTS. The values of von Mises stress and strain of the first model at bone-implant interface were higher than their counterparts of the second model. Stress concentration and high value of strain were recognized surrounding implant of the unloaded side in both models. CONCLUSION. There were different patterns of stress-strain distribution at boneimplant interface between the studied attachment designs. Hader bar-clip attachment showed better biomechanical behavior than adding ERA studs distal to hader bar.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Stress-strain distribution at bone-implant interface of two splinted overdenture systems using 3D finite element analysis

Hussein

2013

J Adv Prosthodont

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“…Boundary conditions included constraining three degrees of freedom at each of the nodes located at the mandibular condyles. The models were loaded by an axial vertical load of 100 N applied on the right first molar, using a masticatory bolus simulation modeled as a rigid semi-sphere placed over the denture tooth [11,17]. The von Mises stresses were qualitatively analyzed in selected areas.…”

Section: Continuous Geometric Modelsmentioning

confidence: 99%

Three-dimensional finite element analysis of mandibular overdentures with different implant positions and attachment types

Broilo¹,

Sartori²,

Mariano³

et al. 2018

Rev. Odonto Ciênc. (Online)

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OBJECTIVE: This 3-D FEA study compared the stress distribution in two-implant mandibular overdentures as a function of implant position and attachment system (LA: locator attachment vs. BA: ball attachment). METHODS: Four models of mandibular overdentures were tested: M1-LA -with implants at the canine regions (standard implant position) and LA; M2-LA -with implants placed at the first premolar regions (distalized implant position) and LA; M1-BA -with standard implant position and BA; and M2-BA -with distalized implant position and BA. The geometric models were converted into finite element models. A 100 N axial load was applied at the first molar region. The von-Mises stress distribution was compared in selected points. RESULTS: The models with BA had pattern of stress distribution was more uniform along the implant axis than the ones with LA, although the stress magnitude was larger. The largest area of von Mises stresses on the alveolar ridge was in the models with standard implant distribution. CONCLUSION: The findings showed that the models with BA had better biomechanical behavior than the ones with LA. For both types of attachment, the models with increased inter-implant distance presented a smaller area of stress distribution in the perimplant cortical bone tissue than the standard implant position.Keywords: dental implants; implant-supported overdenture; biomechanics; finite element analysis.Análise de elementos finitos em 3D de sobredentaduras mandibulares com diferentes posições de implante e tipos de encaixe RESUMO OBJETIVO: Este estudo de análise de elementos finitos em 3-D comparou a distribuição de tensão em sobredentaduras suportadas por implante em função da posição do implante e do sistema de encaixe (AA: tipo "locator" vs. BA: tipo "bola") METODOLOGIA: Foram testados quatro modelos 3-D de sobredentadura com implante mandibular: M1-LAcom implantes nas regiões dos dentes caninos (posição padrão dos implantes) e LA; M2-LA -com implantes nas regiões dos dentes primeiros pré-molares (posição distalizada dos implantes) e LA; M1-BA -com posição padrão de implante e BA; e M2-BA -com posição distalizada dos implantes e BA. Os modelos geométricos foram convertidos em modelos de elementos finitos. Uma carga axial de 100 N foi aplicada na primeira região molar. A distribuição de estresses von Mises foi comparada em pontos selecionados. RESULTADOS: Os modelos com BA apresentaram padrão de distribuição de estresse mais uniforme ao longo do eixo do implante do que os modelos com LA, embora a magnitude do estresse tenha sido maior. A maior área de tensões no rebordo alveolar ocorreu nos modelos com posição padrão de implantes. CONCLUSÃO: Os resultados sugerem que os modelos com BA apresentaram melhor comportamento biomecânico do que aqueles com LA. Para ambos os encaixes, implantes distalizados apresentam uma menor área de distribuição de estresse no tecido ósseo cortical do que posicionamento padrão dos implantes.Palavras-chave: implantes dentários; sobredentadura sobre implantes; biomecânica; anális...

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“…The overdenture is an alternative to fixed implant-supported prosthesis for its relatively low-cost and in clinical cases where it is impossible to place multiple implants with appropriate number and arrangement in the arch to support a fixed prosthesis. 4 Removable implant-retained dentures provide an alternative treatment that successfully replaces the esthetics and function along with minimal maintenance. 1 A key factor in the success or failure of a dental implant is the manner in which stresses are transferred to the surrounding bone.…”

Section: Introductionmentioning

confidence: 99%

A Finite Element Analysis on Stress Distribution in Overdenture Implants and Implant Abutment Interface Using Different Attachment Systems: An In Vitro Study

Javaid¹,

Kalra²,

Kumar³

et al. 2020

Dental Journal of Advance Studies

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Introduction The overdenture is an alternative to fixed implant-supported prosthesis for its relatively low-cost and in clinical cases where it is impossible to place multiple implants with appropriate number and arrangement in the arch to support a fixed prosthesis. In implant-supported overdentures, many attachments such as bars, ball, and magnets can be used. The anchorage system affects the retention and stability of the overdenture as well as the load transfer to the implant and the bone. The purpose of this study was to evaluate the exerted stresses on implants and implant–abutment interface by comparing different attachment systems used for implant-supported maxillary and mandibular overdentures using finite-element analysis. Materials and Methods Stress distribution in five different models with different attachments were evaluated using finite-element analysis. The studied attachment systems were Ball/O-ring and bar-clip attachments. Three models in mandible were studied, two implants with ball attachments, two implants with bar, and four implants connected with a bar. In maxilla, two models were studied, four implants with ball attachments, and four implants connected with bar. Forces were applied bilaterally on each model in the canine and molar region separately. The forces applied were 35N axially, 70N obliquely, and 10N horizontally. Results The ball attachments models showed the highest amount of stresses on the bone and on the implants in maxilla and mandible. The bar-clip attachment with four implants showed least stress in maxilla as well as in the mandible. The bar on four implants has better stress distribution as compared with the bar on the two implants.

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Stresses in implant-supported overdentures with bone resorption: a 3-D finite element analysis

Cited by 7 publications

References 0 publications

Stress-strain distribution at bone-implant interface of two splinted overdenture systems using 3D finite element analysis

Stress-strain distribution at bone-implant interface of two splinted overdenture systems using 3D finite element analysis

Three-dimensional finite element analysis of mandibular overdentures with different implant positions and attachment types

A Finite Element Analysis on Stress Distribution in Overdenture Implants and Implant Abutment Interface Using Different Attachment Systems: An In Vitro Study

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