Influence of Cortical Bone Quality on Stress Distribution in Bone around Dental Implant

Kitagawa, T.; Tanimoto, Yasuhiro; Nemoto, Kimiya; Aida, Masahiro

doi:10.4012/dmj.24.219

Cited by 69 publications

(58 citation statements)

References 23 publications

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“…[1,23] Thicker cortical bone (D2) reduces stress concentration around the implants. [33,34] The results of the present study are consistent with the studies above in terms of stress values being greater with trabecular bone (D4) than with cortical bone (D2).…”

Section: Final Remarkssupporting

confidence: 82%

Three-dimensional finite-element analysis of a single implant-supported zirconia framework and its effect on stress distribution in D4 (maxilla) and D2 (mandible) bone quality

Güven

Demirci

Yavuz

et al. 2015

Biotechnology & Biotechnological Equipment

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The aim of this in-silico study was to compare stress distributions in implants and zirconia frameworks of mandibular and maxillary implant-supported crowns. For comparison, vertical and oblique loading forces were used. Three-dimensional finite-element implant models of a mandibular section of bone (D2) and a maxillary section of bone (D4) with missing second molars and their zirconium-based superstructures were used. Zimmer dental implants of 13 mm in length and 4.7 mm in diameter were modelled. A load of 200 N was applied toward vertical and oblique (30 to the vertical) directions. Maximum and minimum von Mises stress values of the implants and the zirconia framework were calculated. The highest stress value was concentrated in the zirconia framework of the maxillary implant-supported model with the oblique loading force (301.17 MPa). The lowest stress value was concentrated in the mandibular implant-supported model. And the stress values in the maxilla were higher than in the mandible. The maxilla (D4) showed higher stress values than in the mandible (D2), because the trabecular bone is weaker and less resistant to deformation than the cortical bone. Stress values with oblique loading forces were higher than with vertical loading forces. Because of the high Young's modulus of zirconia (low elastic properties), zirconia frameworks showed higher stress values than the implants.Keywords: finite element analysis (FEA); stress distribution; zirconia framework; bone quality; vertical and oblique loading force 3D three dimensional D2 mandibular section of bone D4 maxillary section of bone FE finite element FPDs fixed partial dentures Y-TZP yttrium oxide partially stabilized

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Section: Final Remarkssupporting

confidence: 82%

Three-dimensional finite-element analysis of a single implant-supported zirconia framework and its effect on stress distribution in D4 (maxilla) and D2 (mandible) bone quality

Güven

Demirci

Yavuz

et al. 2015

Biotechnology & Biotechnological Equipment

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“…In agreement with a number of studies, [33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49][50][51][52] the von Mises stress field (σ VM ) was used as an indicator of the average stress level at the periimplant region, providing a global measure of load transfer mechanisms. Moreover, in agreement with the maximum normal stress criterion, 60 principal stresses were used at the bone-implant interface to define local risk indicators of physiological bone failure and of the activation of bone resorption.…”

mentioning

confidence: 78%

“…It is worth noting that, in a number of recent numerical studies, the influence of crestal bone loss in functioning implants and of detailed geometrical modelling for the site of placement have been disregarded. 20,39,[41][42][43][44][45][46][47][48] Based on the findings presented here, ossointegrated implants should be chosen and/or designed considering 2 factors: first, that overloading risk at periimplant regions is primarily dependent on implant size (diameter and length) and the site of placement, and secondly, that the biomechanical stress-based performance of implants improves when crestal bone loss is effectively counteracted.…”

mentioning

confidence: 99%

The influence of implant diameter and length on stress distribution of osseointegrated implants related to crestal bone geometry: A three-dimensional finite element analysis

Baggi

Cappelloni

Girolamo

et al. 2008

The Journal of Prosthetic Dentistry

419

305

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Numerical results suggest that implant diameter may be more effective than implant length as a design parameter to control the risk of bone overload. For a given implant in the molar region, the worst load transmission mechanisms arise with maxillary placement, and implant biomechanical behavior greatly improves if bone is efficiently preserved at the crest. Statement of problem.Load transfer mechanisms and possible failure of osseointegrated implants are affected by implant shape, geometrical and mechanical properties of the site of placement, as well as crestal bone resorption. Suitable estimation of such effects allows for correct design of implant features.Purpose. The purpose of this study was to analyze the influence of implant diameter and length on stress distribution and to analyze overload risk of clinically evidenced crestal bone loss at the implant neck in mandibular and maxillary molar periimplant regions. Material and methods.Stress-based performances of 5 commercially available implants (2 ITI, 2 Nobel Biocare, and 1 Ankylos implant; diameters of 3.3 mm to 4.5 mm, bone-implant interface lengths of 7.5 mm to 12 mm) were analyzed by linearly elastic 3-dimensional finite element simulations, under a static load (lateral component: 100 N; vertical intrusive component: 250 N). Numerical models of maxillary and mandibular molar bone segments were generated from computed tomography images, and local stress measures were introduced to allow for the assessment of bone overload risk. Different crestal bone geometries were also modelled. Type II bone quality was approximated, and complete osseous integration was assumed.Results. Maximum stress areas were numerically located at the implant neck, and possible overloading could occur in compression in compact bone (due to lateral components of the occlusal load) and in tension at the interface between cortical and trabecular bone (due to vertical intrusive loading components). Stress values and concentration areas decreased for cortical bone when implant diameter increased, whereas more effective stress distributions for cancellous bone were experienced with increasing implant length. For implants with comparable diameter and length, compressive stress values at cortical bone were reduced when low crestal bone loss was considered. Finally, dissimilar stress-based performances were exhibited for mandibular and maxillary placements, resulting in higher compressive stress in maxillary situations.Conclusions. Implant designs, crestal bone geometry, and site of placement affect load transmission mechanisms. Due to the low crestal bone resorption documented by clinical evidence, the Ankylos implant based on the platform switching concept and subcrestal positioning demonstrated better stress-based performance and lower risk of bone overload than the other implant systems evaluated. (J Prosthet Dent 2008;100:422-431) The influence of implant diameter and length on stress distribution of osseointegrated implants related to crestal bone geometry: A threedimensional fi...

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“…Perennially, implant success is of utmost concern and importance to all patients at all times. Against this backdrop, strength analyses and fatigue tests have been performed to predict and determine the clinical performance of dental implants [3][4][5][6][7] . In particular, for restoration with ITI implants (Φ: 3.3 mm, L: 12 mm, pure titanium: grade 4), Merz et al of the Institute Straumann performed fatigue tests to analyze the fatigue resistance of implantabutment connectors 8) .…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Stress Analysis of Titanium Implants by Finite Element Method

et al. 2008

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With use of dental implants on the rise, there is also a tandem increase in the number of implant fracture reports. To the end of investigating the stress occurring in implants, elasticity and plasticity analyses were performed using the finite element method. The following results were obtained:(1) With one-piece type of implants of 3.3 mm diameter, elasticity analysis showed that after applying 500 N in a 45-degree direction, stress exceeding 500 MPa -which is the proof stress of grade 4 pure titanium -occurred. This suggested the possibility of fatigue destruction due to abnormal occlusal force, such as during bruxism. (2) With two-piece type of implants that can tolerate vertical loading of 5,000 N, plasticity analysis suggested the possibility of screw area fracture after applying 500 N in a 45-degree direction. (3) On the combined use of an abutment and a fixture from different manufacturers, fracture destruction of even Ti-6Al-4V, which has a high degree of strength, was predicted.

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Influence of Cortical Bone Quality on Stress Distribution in Bone around Dental Implant

Cited by 69 publications

References 23 publications

Three-dimensional finite-element analysis of a single implant-supported zirconia framework and its effect on stress distribution in D4 (maxilla) and D2 (mandible) bone quality

Three-dimensional finite-element analysis of a single implant-supported zirconia framework and its effect on stress distribution in D4 (maxilla) and D2 (mandible) bone quality

The influence of implant diameter and length on stress distribution of osseointegrated implants related to crestal bone geometry: A three-dimensional finite element analysis

Nonlinear Stress Analysis of Titanium Implants by Finite Element Method

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