Three‐dimensional finite element analysis of implant stability in the atrophic posterior maxilla

Tepper, Gabor; Haas, Robert; Zechner, Werner; Krach, Wolfgang; Watzek, Georg

doi:10.1034/j.1600-0501.2002.130613.x

Cited by 80 publications

(79 citation statements)

References 27 publications

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“…FE models with complex geometric structures can be easily modified to accommodate various assumptions. The quality of the FE model is determined by its concurrence with anatomical and natural conditions [2,11,18,19,20,21].…”

Section: Discussionmentioning

confidence: 99%

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Three-Dimensional Finite Element Analysis of Maxillary Sinus Floor Augmentation with Optimal Positioning of a Bone Graft Block

Schuller‐Götzburg¹,

Forte²,

Pomwenger³

et al. 2018

Preprint

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2 AbstractPurpose: The aim of the present experimental 3D-finite element study was to evaluate the influence of an augmented sinus lift with an additional inserted bone graft block. The bone graft block stabilizes the implant in addition to conventional augmented bone. We placed the block in three different positions. The implants were loaded with axial force and forces secondary to laterotrusion and protrusion. Material and Methods:A simplified U-shaped 3D finite element model of the upper jaw and a more complex anatomical model of the left maxilla were created. The bone graft block was placed in three positions: in the lower third in contact with the sinus floor, the middle, and the upper third of the implant. Van Mises' stress distribution was calculated and analyzed for the different models. We also compared the complex anatomical model with the simplified one. Results:The position of the bone graft block significantly influences the magnitude of stress distribution. A bone graft block positioned in the upper third or middle of the implant reduces the quantity of stress compared to the reference model without a bone graft block. The low bone graft block position is clearly associated with lower stress distribution in compact bone.We registered no significant differences in stress in compact bone with regard to laterotrusion or protrusion. Conclusions:Maximum values of von Mises stresses in compact bone can be reduced significantly by using a bone graft block. The reduction of stress is nearly the same for positions in the upper third and the middle of the implant. It is much more pronounced when the bone graft block is in the lower third of the implant near the sinus floor, which appeared to be the best position in the present study.

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Section: Discussionmentioning

confidence: 99%

“…Cumulative distribution functions (CDF's) are used to interpret the results as well as visualize changes between distributions in the statistical analysis [5,11,15,16].…”

Section: Discussionmentioning

confidence: 99%

Three-Dimensional Finite Element Analysis of Maxillary Sinus Floor Augmentation with Optimal Positioning of a Bone Graft Block

Schuller‐Götzburg¹,

Forte²,

Pomwenger³

et al. 2018

Preprint

View full text Add to dashboard Cite

show abstract

“…Cumulative distribution functions (CDF's) are used to interpret the results as well as visualize changes between distributions in the statistical analysis [5,11,18,19].…”

Section: Discussionmentioning

confidence: 99%

“…Second, frictional contact (as in nature) with a friction coefficient of 0.3 was employed [9]. The friction coefficient was used according to previous studies [9]; it simulates the contact of the implant after insertion, at the beginning of the osseointegration process [10][11][12].…”

Section: Contact Definitionmentioning

confidence: 99%

Three-Dimensional Finite Element Analysis of Maxillary Sinus Floor Augmentation with Optimal Positioning of a Bone Graft Block

et al. 2018

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Purpose: the aim of the computational 3D-finite element study is to evaluate the influence of an augmented sinus lift with additional inserted bone grafting. The bone graft block stabilizes the implant in conjunction with conventional bone augmentation. Two finite element models were applied: the real geometry based bone models and the simplified geometry models. The bone graft block was placed in three different positions. The implants were loaded first with an axial force and then with forces simulating laterotrusion and protrusion. This study examines whether the calculated stress behavior is symmetrical for both models. Having established a symmetry between the primary axis, the laterotrusion and protrusion behavior reduces calculation efforts, by simplifying the model. Material and Methods: a simplified U-shaped 3D finite element model of the molar region of the upper jaw and a more complex anatomical model of the left maxilla with less cortical bone were created. The bone graft block was placed in the maxillary sinus. Then the von Mises stress distribution was calculated and analyzed at three block positions: at contact with the sinus floor, in the middle of the implant helix and in the upper third of the implant. The two finite element models were then compared to simplify the modelling. Results: the position of the bone graft block significantly influences the magnitude of stress distribution. A bone graft block positioned in the upper third or middle of the implant reduces the quantity of stress compared to the reference model without a bone graft block. The low bone graft block position is clearly associated with lower stress distribution in compact bone. We registered no significant differences in stress in compact bone with regard to laterotrusion or protrusion. Conclusions: maximum values of von Mises stresses in compact bone can be reduced significantly by using a bone graft block. The reduction of stress is nearly the same for positions in the upper third and the middle of the implant. It is much more pronounced when the bone graft block is in the lower third of the implant near the sinus floor, which appeared to be the best position in the present study.

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“…The Poisson's ratio of commercially pure titanium was 0.33 and Young's modulus was 105 GPa. 13 The finite element mesh was created from shell elements. Shell elements are 3-node triangular elements used for the analysis of three-dimensional structural models.…”

Section: Jaypeementioning

confidence: 99%

Stress in the Mandible with Splinted Dental Implants caused by Limited Flexure on Mouth Opening: An in vitro Study

Radnai¹,

Erdohelyi²,

Szabó³

et al. 2012

International Journal of Experimental Dental Science

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Aim: The aim of this study was to evaluate the stress developed in the bar connecting implants and in the mandible as a result of the elastic deformation of the mandible during mouth opening when using a finite element method (FEM). Materials and methods:A three-dimensional model of an edentulous mandible was generated based on the computer tomography (CT) data of a patient. Two cylindrical implants (diameter 4.3 mm, length13 mm) were inserted in the area of the mandibular canine, premolar and molar in the mandibular model. Implants were connected with a rigid bar (width 2 mm, height 3 mm), and mouth opening was simulated on the threedimensional (3D) model. The location and magnitude of maximum von Misess stress that occurred in the mandible and in the bar were estimated. Results:The highest stress level in the mandible (4.5 GPa) and in the splint (32 GPa) was measured in the longest fixed partial denture with the implants in the mandibular left canine and left second molar position. The maximum stress in the bone was measured distal to the splinted implants. Conclusion:Since, great distance between splinted implants caused high stress during mouth opening, due to mandibular deformation, the use of a short span fixed partial denture supported by implants in the molar region of the edentulous mandible is probably more advantageous.

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Three‐dimensional finite element analysis of implant stability in the atrophic posterior maxilla

Cited by 80 publications

References 27 publications

Three-Dimensional Finite Element Analysis of Maxillary Sinus Floor Augmentation with Optimal Positioning of a Bone Graft Block

Three-Dimensional Finite Element Analysis of Maxillary Sinus Floor Augmentation with Optimal Positioning of a Bone Graft Block

Three-Dimensional Finite Element Analysis of Maxillary Sinus Floor Augmentation with Optimal Positioning of a Bone Graft Block

Stress in the Mandible with Splinted Dental Implants caused by Limited Flexure on Mouth Opening: An in vitro Study

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