Implant Inclination and Horizontal Misfit in Metallic Bar Framework of Overdentures: Analysis By 3D-FEA Method

Caldas, Ricardo Armini; Pfeifer, Carmem S.; Bacchi, Ataís; Santos, Mateus Bertolini Fernandes dos; Reginato, Vagner Flávio

doi:10.1590/0103-6440201801672

Cited by 6 publications

(7 citation statements)

References 20 publications

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“…26,27 However, few studies exist on the in vitro effect of posterior implant's inclination on the bone resorption and survival rates of the implant-supported fixed partial dentures, which makes our study results valuable. 16,17,[28][29][30] Our study exhibited that stress values for the crestal bone were the highest around the tilted posterior implants for both loading modes, which is in agreement with two previous studies. 16,17 Posterior implant inclination caused 34.25% higher bone stress for vertical loading, and 40.52% higher stress for oblique loading but this was the average of two peri-implant bone areas.…”

Section: Discussionsupporting

confidence: 93%

“…However, limited in vitro studies exist concerning the effects of the tilted implants on the biomechanics of the fixed partial dentures and the surrounding system. 16,17 There is also a lack of information about the comparison of stress levels at the peri-implant bone and the implant-abutment complex of posterior mandibular implants with different neck geometries, inclined angles, and diameters. Our hypothesis was that changing the neck platform design, inclination, and diameter of the posterior implant will cause different stress levels at the peri-implant bone area and implant-abutment complex.…”

Section: Introductionmentioning

confidence: 99%

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Biomechanical evaluation of stress distributions at the implant-abutment complex and peri-implant bone around mandibular dental implants with different neck geometries and inclinations

Dinc¹,

Türkoğlu²,

Selvi

2021

Proc Inst Mech Eng H

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This study aimed to investigate the effects of the different dental implant neck designs, diameters, and inclinations, on the stress distributions at the mandibular crestal bone and implant-abutment complex, using three-dimensional (3D) finite element stress analysis (FEA) method. Finite element models of three-unit fixed partial dentures supported with two same length implants (10 mm), placed on the second premolar and second molar regions, were designed. Eight different models were designed according to the implants’ neck designs (platform switching/traditional), diameters (4.1 mm/4.8 mm) and the tilting angles of the posterior implants (0°/15°). The anterior implants’ widths were 4.1 mm and the neck design of the anterior implants matched the posterior implants. Two types of 100-N loads in vertical and 30° oblique directions were applied separately onto each central fossae and functional cusps of the fixed partial dentures crowns. Algor Fempro Software was used for the simulation and evaluation of the stress levels at the implant-abutment complex and the crestal bone. Stress levels measured at the crestal bone were found to be lower for the platform switching models. However, the platform switching design generated higher stress magnitudes within the implant-abutment complex. Inclined placement of posterior implants increased the amount of stress at the crestal bone around both implants. Biomechanically, selection of the largest diameter possible when using tilted platform switched implants may be recommended at the posterior mandible.

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Section: Discussionsupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Biomechanical evaluation of stress distributions at the implant-abutment complex and peri-implant bone around mandibular dental implants with different neck geometries and inclinations

Dinc¹,

Türkoğlu²,

Selvi

2021

Proc Inst Mech Eng H

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“…Descriptives, advantages and limitations of the techniques are listed in Table 6. Within the 23 articles solely used modeling assessments, 10 investigated with SGA, 16,60‐69 1 with PSA, 70 1 with reverse torque test, 71 and 11 with FEA 10,72‐81 . All 11 studies established the FE model with 2 implants (five overdentures, seven 3‐unit frameworks), while no FEA study was found on complete arch prosthesis supported by multiple implants.…”

Section: Resultsmentioning

confidence: 99%

“…Most of the FEA studies introduced levels of predetermined misfit into the FE models to calculate the resulting stresses concentrated in the implant system, including screws, framework, implants and peri‐implant bone (cortical and cancellous bone). The artificially induced misfit ranged from 5 ~ 300 μm on the vertical plane 73,75‐78,81 and 10 ~ 200 μm on the horizontal plane 10,72,74,79,80 . Besides, vertical bone loss (1.4 mm), 74 unilateral angular misfit (100 μm) 81 and axial/off‐axial forces (100 ~ 200 N) 75,81 were also simulated in different studies.…”

Section: Resultsmentioning

confidence: 99%

“…Studies showed vertical misfit induced more stress in the superstructures (framework, screws and veneering material) than in the infrastructures (implant and peri‐implant bone) 80 because the residual vertical gap, acting as a stress‐breaker, hindered the stress transferring toward the implants and their surroundings 78 . Compared to the vertical misfit, stresses induced by the horizontal misfit were found to be more evenly distributed across the entire system 79 . It was reported that a predetermined horizontal misfit of 10 to 200 μm could induce stresses of 38 to 810 MPa and 33 to 660 MPa in the gold alloy framework and the cortical bone respectively 74 .…”

Section: Discussionmentioning

confidence: 99%

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Implant framework misfit: A systematic review on assessment methods and clinical complications

Pan

Tsoi

Lam

et al. 2020

Clin Implant Dent Rel Res

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Background The fit of implant‐supported prostheses is of prime importance for the long‐term success of implant therapy. Purpose This systematic review aimed to evaluate recent evidence on current techniques for assessing implant‐framework misfit, its associated strain/stress, and whether these misfits are related to mechanical, biological, and clinical consequences. Materials and methods An electronic search for publications from January 2010 to October 2020 was performed using the Pubmed, Embase, Web of Science, and Cochrane Library databases with combined keywords on implant‐framework misfit assessments and related clinical complications. Inclusion and exclusion criteria were applied. After full‐text analyses, data extraction was implemented on current techniques of misfit assessment and the relationship between the misfit and the induced strain/stress. Results A total of 3 in vivo and 92 in vitro studies were selected, including 47 studies on quantifying the degree of implant‐framework misfit with dimensional techniques, 24 studies measuring misfit‐induced strain/stress with modeling techniques, and 24 studies using both methods. The technical details, advantages, and limitations of each technique were illustrated. The correlation between the implant‐framework misfit and the induced strain/stress has been revealed in vitro, while that with the biological complications and implant/prostheses failure was weak in clinical studies. Conclusions Dimensional and modeling techniques are available to measure the implant‐framework misfit. The passivity of implant‐supported fixed prostheses appeared related to the induced strain/stress, but not the clinical complications. Further studies combining three‐dimensional (3D) assessments using dimensional and modeling techniques was needed.

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Interaction Phenomena between Dental Implants and Bone Tissue in Case of Misfit: A Pilot Study

et al. 2023

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The biomechanical response of cortical and trabecular bone tissues represents a fundamental aspect for the interpretation of the functional response of dental implants. In the case of misfit, the interaction phenomena occurring within the surgical and the subsequent healing phases must be interpreted primarily in the light of the response of bone tissue. This is influenced by the specific loadings induced, characterized by intensity and variable trends. The pilot study reported, which intentionally refers to a simple case of a two-implants frame, is addressed to define the method to approach the biomechanical investigation of the problem and to attest the necessity to integrate clinical competences with biomechanical analysis for interpreting different aspects of osseointegration. The action induced in cortical and trabecular bone regions depending on the implant frame conformation, the surgical procedure adopted, the varying condition at the bone–implant interface and the evolutionary trend of healing are the principal aspects to be considered to evaluate the osseointegration process. The biomechanical reliability of the specific implant frame is investigated in terms of bone–implant interaction by means of numerical models. This approach can offer valid information and support clinical practice under the fundamental condition that bone biomechanical behavior is properly characterized and represented in the model, in spite of the complex formulation to be adopted.

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Implant Inclination and Horizontal Misfit in Metallic Bar Framework of Overdentures: Analysis By 3D-FEA Method

Cited by 6 publications

References 20 publications

Biomechanical evaluation of stress distributions at the implant-abutment complex and peri-implant bone around mandibular dental implants with different neck geometries and inclinations

Biomechanical evaluation of stress distributions at the implant-abutment complex and peri-implant bone around mandibular dental implants with different neck geometries and inclinations

Implant framework misfit: A systematic review on assessment methods and clinical complications

Interaction Phenomena between Dental Implants and Bone Tissue in Case of Misfit: A Pilot Study

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