Evaluation of stress induced in peri-implant bone tissue by misfit in multi-implant prosthesis

Natali, Alfredo; Pavan, Piero G.; Ruggero, Andrea L.

doi:10.1016/j.prosdent.2006.05.020

Cited by 15 publications

(20 citation statements)

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“…Stresses are also created when ill-fitting prostheses are installed (15,16), and the values of these generated stresses vary with the stiffness of the framework material (13). Previous finite element analyses (FEA) were used to evaluate the influence of the increase in vertical misfit in implant-supported fixed prostheses (8,17) and overdenture-retaining bars supported by two implants (11,18).…”

Section: Introductionmentioning

confidence: 99%

Stress distribution in fixed-partial prosthesis and peri-implant bone tissue with different framework materials and vertical misfit levels: a three-dimensional finite element analysis

Bacchi¹,

Mesquita²,

Santos³

2013

J Oral Sci

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The purpose of this study was to evaluate the influence of superstructure material and vertical misfits on the stresses created in an implant-supported partial prosthesis. A three-dimensional (3-D) finite element model was prepared based on common clinical data. The posterior part of a severely resorbed jaw with two osseointegrated implants at the second premolar and second molar regions was modeled using specific modeling software (SolidWorks 2010). Finite element models were created by importing the solid model into mechanical simulation software (ANSYS Workbench 11). The models were divided into groups according to the prosthesis framework material (type IV gold alloy, silver-palladium alloy, commercially pure titanium, cobalt-chromium alloy, or zirconia) and vertical misfit level (10 µm, 50 µm, and 100 µm) created at one implant-prosthesis interface. The gap of the vertical misfit was set to be closed and the stress values were measured in the framework, porcelain veneer, retention screw, and bone tissue. Stiffer materials led to higher stress concentration in the framework and increased stress values in the retention screw, while in the same circumstances, the porcelain veneer showed lower stress values, and there was no significant difference in stress in the peri-implant bone tissue. A considerable increase in stress concentration was observed in all the structures evaluated within the misfit amplification. The framework material influenced the stress concentration in the prosthetic structures and retention screw, but not that in bone tissue. All the structures were significantly influenced by the increase in the misfit levels. (J Oral Sci 55, 239-244, 2013)

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Section: Introductionmentioning

confidence: 99%

Stress distribution in fixed-partial prosthesis and peri-implant bone tissue with different framework materials and vertical misfit levels: a three-dimensional finite element analysis

Bacchi¹,

Mesquita²,

Santos³

2013

J Oral Sci

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“…implant neck of failing implants, and various hypotheses have been proposed to explain this bone reaction [14]. Animal experiments [15] and clinical studies [16] have shown that bone loss around implants that may lead to implant failure was associated in many cases with unfavourable loading conditions.…”

Section: Discussionmentioning

confidence: 99%

Stress Distribution in Implant Retained Finger Prosthesis: A Finite Element Study

Amornvit

Rokaya

Keawcharoen

et al. 2013

JCDR

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Background: Finger amputation may result from congenital cause, trauma, infection and tumours. The finger amputation may be rehabilitated with dental implant-retained finger prosthesis. The success of implant-retained finger prosthesis is determined by the implant loading. The type of the force is a determining factor in implant loading.Objective: To evaluate stress distributions in finger bone when the loading force is applied along the long axis of the implant using finite element analysis. Method:The finite element models were created. The finger bone model containing cortical bone and cancellous bone was constructed by using radiograph. Astra Tech Osseo Speed bone level implant of 4.5 mm diameter and 14 mm length was selected.The force was applied to the top of the abutment along the long axis of the implant.Results: Finite element analysis indicated that the maximum stress was located at the head of abutment screw. The minimum stress was located in the apical third of the implant fixture. The weakest point was calculated by safety factor which is located in the spongy bone at apical third of the fixtures. Finally, 4.9 times yield stress of spongy bone was needed for the deformation of the spongy bone. Conclusion:Finite element study showed that when the force was applied along the long axis of the implant, the maximum stress was located around the neck of the implant and the cortex bone received more stress than cancellous bone. So, to achieve long term success, the designers of implant systems must confront biomaterial and biomechanical problems including in vivo forces on implants, load transmission to the interface and interfacial tissue response. InTROduCTIOnFingers have an important role in the function and aesthetics. Finger amputation may result from congenital cause, trauma, infection and tumours. The loss of a finger leads to functional and psychological problems. The finger amputation may be rehabilitated with dental implant-retained finger prosthesis. The biomechanical behavior of implant-retained finger prosthesis systems including the reliability and the stability of the implant-abutment and implant bone interface plays an important role in its functional longevity inside the boneThe structure of dental implant is directly connected with a bone that would cause the non-uniform stress pattern of bone and might induce biomechanical overloading failures in implant and bone [2]. The success of implant-retained finger prosthesis is determined by the implant loading, consequently, which leads to the bone loss around the implant. The characteristic of the force is a determining factor in implant loading. This overloading would cause the microdamage accumulation at bone and results in bone loss around the neck of the implant [3]. Furthermore, it is reported that the initiated loss of bone mostly around implant neck evolves deeper into the bone [4,5]. Finite element analyses (FEA) of stressand strain fields have indicated that stress concentration occurring exclusively in the cortical bone near...

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“…FEM was applied to investigate the residual shrinkage stress distributions in dental materials [16,17]. Other studies are related to the simulation of dental implant biomechanics, related to the osteointegration and load mechanism transfer in dental implant-supported prostheses [18][19][20]. This methodology was also applied in prosthodontic and endodontic studies [21][22][23].…”

Section: Conventional Technologiesmentioning

confidence: 99%

“…where λB is the reflected Bragg wavelength, neff the effective refractive index of the fiber core and Λ the periodicity of the refractive index modulation [18]. When the grating is subjected to thermal variations and/or mechanical perturbations the reflected Bragg wavelength changes, according with Equation (5):…”

Section: Working Principlesmentioning

confidence: 99%

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New Trends in Dental Biomechanics with Photonics Technologies

et al. 2015

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Evaluation of stress induced in peri-implant bone tissue by misfit in multi-implant prosthesis

Cited by 15 publications

References 0 publications

Stress distribution in fixed-partial prosthesis and peri-implant bone tissue with different framework materials and vertical misfit levels: a three-dimensional finite element analysis

Stress distribution in fixed-partial prosthesis and peri-implant bone tissue with different framework materials and vertical misfit levels: a three-dimensional finite element analysis

Stress Distribution in Implant Retained Finger Prosthesis: A Finite Element Study

New Trends in Dental Biomechanics with Photonics Technologies

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