Comparative three-dimensional finite element analysis of implant-supported fixed complete arch mandibular prostheses in two materials

Tribst, João Paulo Mendes; Morais, Dayana Campanelli de; Alonso, Alexandre Abhdala

doi:10.4103/jips.jips_11_17

Cited by 38 publications

(31 citation statements)

References 25 publications

(29 reference statements)

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“…Compared to other in vitro methodologies, FEA produces results not only for a surface (photoelastic) but also for a punctual area (strain gauge), 19,20 being the only method to show the strain distribution inside the bone tissue, as commonly used. 21,22,23,24 To examine FEA results on implants, von Mises criteria was chosen to observe the regions with higher stress concentration. 25 To the best of the author's knowledge, there are no studies available in the literature associating implantoplasty and different heights of exposed implants.…”

Section: Discussionmentioning

confidence: 99%

Influence of implantoplasty on stress distribution of exposed implants at different bone insertion levels

2017

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This study evaluated the effect of implantoplasty on different bone insertion levels of exposed implants. A model of the Bone Level Tapered implant (Straumann Institute, Waldenburg, Switzerland) was created through the Rhinoceros software (version 5.0 SR8, McNeel North America, Seattle, WA, USA). The abutment was fixed to the implant through a retention screw and a monolithic crown was modeled over a cementation line. Six models were created with increasing portions of the implant threads exposed: C1 (1 mm), C2 (2 mm), C3 (3 mm), C4 (4 mm), C5 (5 mm) and C6 (6 mm). The models were made in duplicates and one of each pair was used to simulate implantoplasty, by removing the threads (I1, I2, I3, I4, I5 and I6). The final geometry was exported in STEP format to ANSYS (ANSYS 15.0, ANSYS Inc., Houston, USA) and all materials were considered homogeneous, isotropic and linearly elastic. To assess distribution of stress forces, an axial load (300 N) was applied on the cusp. For the periodontal insert, the strains increased in the peri-implant region according to the size of the exposed portion and independent of the threads' presence. The difference between groups with and without implantoplasty was less than 10%. Critical values were found when the inserted portion was smaller than the exposed portion. In the exposed implants, the stress generated on the implant and retention screw was higher in the models that received implantoplasty. For the bone tissue, exposure of the implant's thread was a damaging factor, independent of implantoplasty. Implantoplasty treatment can be safely used to control peri-implantitis if at least half of the implant is still inserted in bone.

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Section: Discussionmentioning

confidence: 99%

Influence of implantoplasty on stress distribution of exposed implants at different bone insertion levels

2017

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“…In stress evaluation studies, the use of a bone tissue simulant material with the same mechanical behavior and capable of guaranteeing the system a reproducible pattern in all the specimens makes studies more concrete in providing inferences about the influence of the variables studied. In this context, polyurethane ( 6 - 10 ) is the material of choice due to its elasticity modulus and scientific validation. Thus, correlating two numerical methodologies to study stress allows for a concise direction to interpret the results for possible elucidation of the clinical occurrence.…”

Section: Introductionmentioning

confidence: 99%

The importance of correct implants positioning and masticatory load direction on a fixed prosthesis

2017

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BackgroundThrough the biomechanical study of dental implants, it is possible to understand the dissipation effects of masticatory loads in different situations and prevent the longevity of osseointegration. Aims: To evaluate the microstrains generated around external hexagon implants, using axial and non-axial loads in a fixed four-element prosthesis with straight implants and implants inclined at 17°.Material and MethodsThree implants were modeled using CAD software following the manufacturer’s measurements. Then, implants were duplicated and divided into two groups: one with straight implants and respective abutments, and the other with angled implants at 17° and respective abutments. Both groups were arranged inside a block simulating bone tissue. A simplified fixed prosthesis was installed on both groups and the geometries were exported to CAE software. Five loads of 300N were performed at axial and non-axial points on the fixed prosthesis. Stress on the implants and strain on the block were both analyzed. An in vitro experiment was performed following all structures made in FEA in order to validate the model. In each experimental block, 4 strain gauges were linearly placed between the implants and the same loads were repeated with a loading applicator device.ResultsThe deformations computed by the gauges were correlated with the FEA results, showing that the group with inclined implants had more damaging biomechanical behavior and was significantly different from the group with straight implants (P<0.005).ConclusionsThe mathematical model used is valid and inclined implants can induce unwanted bone remodeling. Key words:Finite Element Analysis, Dental Implants, Fixed Prosthesis.

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“…The prosthetic screw is one of the main regions of stress concentration and possible mechanical failure in the implant/prosthesis 25,26 . Thus, the concentration of stresses can be facilitated during incidence of oblique loads 6,21,24 .…”

Section: Discussionmentioning

confidence: 99%

“…The von-Mises stress is directly related to the ductile metals failure [25][26][27][28] . Therefore, restorative procedures that involve stress maps with greater magnitude show higher possibility of premature failure 6 .…”

Section: Discussionmentioning

confidence: 99%

“…Therefore, restorative procedures that involve stress maps with greater magnitude show higher possibility of premature failure 6 . Considering the dental implants, studies that have evaluated this type of failure criteria during computational simulations are quite common in order to prevent critical damages in implant-supported prosthesis [24][25][26][27][28] .…”

Section: Discussionmentioning

confidence: 99%

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Biomechanical effect of inclined implants in fixed prosthesis: strain and stress analysis

Rodrigues

Tribst

Santis

et al. 2018

Rev. odontol. UNESP

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Introduction Implant inclinations can be corrected using mini abutments at different angulations. Objective To analyze the influence of external hexagon implants in different inclinations (3 levels) on the microstrain distribution generated around three implants. Method A geometric bone model was created through Rhinoceros CAD software (version 5.0 SR8, Mcneel North America, Seattle, WA, USA). Three implants (4.1 × 13 mm) were modeled and inserted inside the substrate at three different inclinations: 0º, 17º and 30º. Next, all groups received mini conical abutments, fixation screws and a simplified prosthesis. The final geometry was exported in STEP format to analysis software and all materials were considered homogeneous, isotropic and linearly elastic. An axial load (300N) was applied on the center of the prosthesis. An in vitro study was conducted with same conditions and groups for validating the tridimentional model. Result Stress was concentrated on the external area of the implants, in contact with the cortical bone and external hexagon. For the bone simulator, the strain increased in the peri-implant region according to the increase in the implant’s inclination. The difference between groups was significant (p = 0.000). The 30º group presented higher stress and strain concentration. Conclusion The microstrain and stress increase around implants directly proportional to the increase of the installation angle.

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Comparative three-dimensional finite element analysis of implant-supported fixed complete arch mandibular prostheses in two materials

Cited by 38 publications

References 25 publications

Influence of implantoplasty on stress distribution of exposed implants at different bone insertion levels

Influence of implantoplasty on stress distribution of exposed implants at different bone insertion levels

The importance of correct implants positioning and masticatory load direction on a fixed prosthesis

Biomechanical effect of inclined implants in fixed prosthesis: strain and stress analysis

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