scholarly journals Elastography of the bone-implant interface

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Yoann Hériveaux ◽  
Vu-Hieu Nguyen ◽  
Didier Geiger ◽  
Guillaume Haïat
Keyword(s):  
Trabecular Bone ◽  
Bone Structure ◽  
Patient Specific ◽  
Bovine Bone ◽  
Implant Stability ◽  
Contact Ratio ◽  
Bone Implant ◽  
Biomechanical Behavior ◽  
Compressive Stresses ◽  
Trabecular Network

Abstract The stress distribution around endosseous implants is an important determinant of the surgical success. However, no method developed so far to determine the implant stability is sensitive to the loading conditions of the bone-implant interface (BII). The objective of this study is to investigate whether a quantitative ultrasound (QUS) technique may be used to retrieve information on compressive stresses applied to the BII. An acousto-mechanical device was conceived to compress 18 trabecular bovine bone samples onto coin-shaped implants and to measure the ultrasonic response of the BII during compression. The biomechanical behavior of the trabecular bone samples was modeled as Neo-Hookean. The reflection coefficient of the BII was shown to decrease as a function of the stress during the elastic compression of the trabecular bone samples and during the collapse of the trabecular network, with an average slope of −4.82 GPa−1. The results may be explained by an increase of the bone-implant contact ratio and by changes of bone structure occurring during compression. The sensitivity of the QUS response of the BII to compressive stresses opens new paths in the elaboration of patient specific decision support systems allowing surgeons to assess implant stability that should be developed in the future.

scholarly journals Evaluation of Bone–Implant Interface Stress and Strain Using Heterogeneous Mandibular Bone Properties Based on Different Empirical Correlations

2021 ◽  
Author(s):  
Mostafa Omran Hussein ◽  
Mohammed Suliman Alruthea
Keyword(s):  
Finite Element ◽  
Group Iv ◽  
Von Mises Stress ◽  
Patient Specific ◽  
Dental Arch ◽  
Stress And Strain ◽  
Bone Implant ◽  
Bone Properties ◽  
Group I ◽  
Von Mises

Abstract Objective The purpose of this study was to compare methods used for calculating heterogeneous patient-specific bone properties used in finite element analysis (FEA), in the field of implant dentistry, with the method based on homogenous bone properties. Materials and Methods In this study, three-dimensional (3D) computed tomography data of an edentulous patient were processed to create a finite element model, and five identical 3D implant models were created and distributed throughout the dental arch. Based on the calculation methods used for bone material assignment, four groups—groups I to IV—were defined. Groups I to III relied on heterogeneous bone property assignment based on different equations, whereas group IV relied on homogenous bone properties. Finally, 150 N vertical and 60-degree-inclined forces were applied at the top of the implant abutments to calculate the von Mises stress and strain. Results Groups I and II presented the highest stress and strain values, respectively. Based on the implant location, differences were observed between the stress values of group I, II, and III compared with group IV; however, no clear order was noted. Accordingly, variable von Mises stress and strain reactions at the bone–implant interface were observed among the heterogeneous bone property groups when compared with the homogenous property group results at the same implant positions. Conclusion Although the use of heterogeneous bone properties as material assignments in FEA studies seem promising for patient-specific analysis, the variations between their results raise doubts about their reliability. The results were influenced by implants’ locations leading to misleading clinical simulations.

In Vivo and In Vitro Evaluation of Coated HAp Films with Different Surface Morphology

2007 ◽  
Vol 539-543 ◽  
pp. 710-715
Author(s):  
Kotaro Kuroda ◽  
Ryoichi Ichino ◽  
Masazumi Okido
Keyword(s):  
Bone Formation ◽  
Surface Morphology ◽  
New Bone Formation ◽  
Contact Ratio ◽  
Bone Implant ◽  
Ft Ir ◽  
Mouse Osteoblast ◽  
Surface Morphologies

Hydroxyapatite (HAp) coatings were formed on cp titanium plates and rods by the thermal substrate method in an aqueous solution that included 0.3 mM Ca(H2PO4)2 and 0.7 mM CaCl2. The coating experiments were conducted at 40-140 oC and pH = 8 for 15 or 30 min. The properties for the coated samples were studied using XRD, EDX, FT-IR, and SEM. All the specimens were covered with HAp, which had different surface morphologies such as net-like, plate-like and needle-like. After cleaning and sterilization, all the coated specimens were subjected to in vivo and vitro testing. In the in vitro testing, the mouse osteoblast-like cells (MC3T3-E1) were cultured on the coated and non-coated specimens for up to 30 days. Moreover, the specimens (φ2 x 5 mm) were implanted in rats femoral for up to 8 weeks, the osseoinductivity on them were evaluated. In in vitro evaluations, there were not significant differences between the different surface morphologies. In in vivo evaluations, however, two weeks postimplantation, new bone formed on both the HAp coated and non-coated titanium rods in the cancellous and cortical bone. The bone-implant contact ratio, which was used for the evaluation of new bone formation, was significantly dependent on the surface morphology of the HAp, and the results demonstrated that the needle-like coating appears to promote rapid bone formation.

Local Differences in the Trabecular Bone Structure of the Proximal Femur Depicted with High-Spatial-Resolution MR Imaging and Multisection CT

2002 ◽  
Vol 9 (12) ◽  
pp. 1395-1406 ◽  
Author(s):  
Ahi Sema Issever ◽  
Volker Vieth ◽  
Albrecht Lotter ◽  
Norbert Meier ◽  
Andres Laib ◽  
...  
Keyword(s):  
Mr Imaging ◽  
Trabecular Bone ◽  
Spatial Resolution ◽  
Proximal Femur ◽  
High Spatial Resolution ◽  
Bone Structure ◽  
Trabecular Bone Structure

Association of cortical shape of the mandible on panoramic radiographs with mandibular trabecular bone structure in Japanese adults: a cone-beam CT-image analysis

2013 ◽  
Vol 30 (2) ◽  
pp. 160-167 ◽  
Author(s):  
Noriyasu Mochizuki ◽  
Noriyuki Sugino ◽  
Tadashi Ninomiya ◽  
Nobuo Yoshinari ◽  
Nobuyuki Udagawa ◽  
...  
Keyword(s):  
Image Analysis ◽  
Trabecular Bone ◽  
Bone Structure ◽  
Cone Beam Ct ◽  
Trabecular Bone Structure ◽  
Cone Beam ◽  
Ct Image ◽  
Panoramic Radiographs ◽  
Japanese Adults ◽  
Ct Image Analysis
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