Influence of Clinically Relevant Factors on the Immediate Biomechanical Surrounding for a Series of Dental Implant Designs

2011 ◽  
Vol 133 (3) ◽  
Author(s):  
Vasanth Chakravarthy Shunmugasamy ◽  
Nikhil Gupta ◽  
Roberto Sales Pessoa ◽  
Malvin N. Janal ◽  
Paulo G. Coelho
Keyword(s):  
Bone Loss ◽  
Trabecular Bone ◽  
Dental Implant ◽  
Loading Condition ◽  
Implant Design ◽  
Bone Thickness ◽  
Element Analysis ◽  
Clinical Scenarios ◽  
Bone Elastic Modulus ◽  
Relevant Factors

The objective of the present study was to assess the influence of various clinically relevant scenarios on the strain distribution in the biomechanical surrounding of five different dental implant macrogeometries. The biomechanical environment surrounding an implant, i.e., the cortical and trabecular bone, was modeled along with the implant. These models included two different values of the study parameters including loading conditions, trabecular bone elastic modulus, cortical/trabecular bone thickness ratio, and bone loss for five implant designs. Finite element analysis was conducted on the models and strain in the bones surrounding the implant was calculated. Bone volumes having strains in four different windows of 0–200 με, 200–1000 με, 1000–3000 με, and >3000 με were measured and the effect of each biomechanical variable and their two-way interactions were statistically analyzed using the analysis of variance method. This study showed that all the parameters included in this study had an effect on the volume of bones in all strain windows, except the implant design, which affected only the 0–200 με and >3000 με windows. The two-way interaction results showed that interactions existed between implant design and bone loss, and loading condition, bone loss in the 200–1000 με window, and between implant design and loading condition in the 0–200 με window. Within the limitations of the present methodology, it can be concluded that although some unfavorable clinical scenarios demonstrated a higher volume of bone in deleterious strain levels, a tendency toward the biomechanical equilibrium was evidenced regardless of the implant design.

Preliminary Evaluation of a New Dental Implant Design with Finite Element Analysis

2005 ◽  
Vol 288-289 ◽  
pp. 657-660
Author(s):  
Xue Jun Wang ◽  
R. Wang ◽  
J.M. Luo ◽  
Ji Yong Chen ◽  
Xing Dong Zhang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Dental Implant ◽  
Peak Stress ◽  
Implant Design ◽  
Preliminary Evaluation ◽  
Element Analysis ◽  
Mechanical Coupling ◽  
Stress Transmission ◽  
Reducing Stress

It is important to obtain mechanical coupling between dental implants and bone, because the lack of mechanical coupling may cause bone loss around implants. In this research, a new cylindrical dental implant composed of three parts was designed to offer favored mechanical environment for the bone. A special gap structure changed the means of the stress transmission and decreased the stress in the cortical bone around the neck of the implant. Through finite element analysis (FEA) of stress distribution in bone around implant-bone interface, the advantages of this new implant (reducing stress concentration in cervical cortex and satisfying varieties of clinical needs) were verified. The peak stress for the new design was about 30 percent less than that of the traditional implant and the flexibility of the design was also confirmed by changing the gap depth and the wall thickness.

Finite Element Analysis of an Osseointegrated Stepped Screw Dental Implant

2004 ◽  
Vol 30 (4) ◽  
pp. 223-233 ◽  
Author(s):  
J. P. Geng ◽  
W. Xu ◽  
K. B. C. Tan ◽  
G. R. Liu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Trabecular Bone ◽  
Cortical Bone ◽  
Dental Implant ◽  
Elastic Moduli ◽  
Von Mises Stress ◽  
Element Analysis ◽  
Data Set ◽  
Bone Level

Abstract An osseointegrated stepped screw dental implant was evaluated using 2-dimensional finite element analysis (FEA). The implant was modeled in a cross section of the posterior human mandible digitized from a computed tomography (CT) generated patient data set. A 15-mm regular platform (RP) Branemark implant with equivalent length and neck diameter was used as a control. The study was performed under a number of clinically relevant parameters: loading at the top of the transmucosal abutment in vertical, horizontal, and 45° oblique 3 orientations. Elastic moduli of the mandible varied from a normal cortical bone level (13.4 GPa) to a trabecular bone level (1.37 GPa). The study indicated that an oblique load and elastic moduli of the cortical bone are important parameters to the implant design optimization. Compared with the cylindrical screw implant, the maximum von Mises stress of the stepped screw implant model was 17.9% lower in the trabecular bone-implant area. The study also showed that the stepped screw implant is suitable for the cortical bone modulus from 10 to 13.4 GPa, which is not necessarily as strict as the Branemark implant, for which a minimum 13.4 GPa cortical bone modulus is recommended.

Influence of Dental Implant Design on Stress Distribution and Micromotion of Mandibular Bone

2020 ◽  
Vol 899 ◽  
pp. 81-93
Author(s):  
Nur Faiqa Ismail ◽  
M. Saiful Islam ◽  
Solehuddin Shuib ◽  
Rohana Ahmad ◽  
M. Amar Shahmin
Keyword(s):  
Shear Stress ◽  
Dental Implant ◽  
Cancellous Bone ◽  
3D Models ◽  
Von Mises Stress ◽  
Implant Design ◽  
Element Analysis ◽  
Reconstruction Process ◽  
Mandibular Bone ◽  
Von Mises

This research was conducted to provide a feasible method for reconstructing the 3D model of mandibular bone to undergo finite element analysis to investigate von Mises stress, deformation and shear stress located at the cortical bone, cancellous one and neck implant of the proposed dental implant design. Dental implant has become a significant remedial approach but although the success rate is high, the fixture failure may happen when there are insufficient host tissues to initiate and sustain the osseointegration. Computerised Tomography scan was conducted to generate head images for bone reconstruction process. MIMICS software and 3-matic software were used to develop the 3D mandibular model. The reconstructed mandibular model was then assembled with five different 3D models of dental implants. Feasible boundary conditions and material properties were assigned to the developed muscle areas and joints. The highest performance design with the best responses was the design B with the value for the von Mises stress for the neck implant, cortical and cancellous bone were 7.53 MPa, 16.91 MPa and 1.34 MPa respectively. The values for the maximum of micromotion for the neck implant, cortical and cancellous bone of design B were 20.60 μm, 21.17 μm and 5.83 μm respectively. Shear stress for neck implant, cortical and cancellous bone for this design were 0.15 MPa, 4.74 MPa and 1.54 MPa respectively. The design with a cone shaped hole which is design B was the proper design when compared with other designs in terms of von Misses stress, deformations and shear stress.

Simulation of vertebral trabecular bone loss using voxel finite element analysis

2009 ◽  
Vol 42 (16) ◽  
pp. 2789-2796 ◽  
Author(s):  
P. Mc Donnell ◽  
N. Harrison ◽  
M.A.K. Liebschner ◽  
P.E. Mc Hugh
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Bone Loss ◽  
Trabecular Bone ◽  
Element Analysis ◽  
Vertebral Trabecular Bone ◽  
Trabecular Bone Loss

scholarly journals Trabeculae microstructure parameters serve as effective predictors for marginal bone loss of dental implant in the mandible

2020 ◽  
Author(s):  
Hengguo Zhang ◽  
Jie Shan ◽  
Ping Zhang ◽  
Hongbing Jiang
Keyword(s):  
Machine Learning ◽  
Bone Loss ◽  
Trabecular Bone ◽  
Dental Implant ◽  
Early Stage ◽  
Superior Performance ◽  
Morphological Parameters ◽  
Marginal Bone Loss ◽  
Microstructure Parameters ◽  
Functional Loading

Abstract Background : To investigate the effectiveness and feasibility of machine learning models based on trabecular microstructure parameters for predicting the occurrence of marginal bone loss (MBL) of the submerged dental implant in mandible. Methods : Clinical variables and morphological parameters of trabecular bone were collected from 81 subjects with submerged implants in the mandible (41 cases of abnormal MBL and 40 as normal controls). We measured the peri-implant MBL level by a cone-beam computed tomography (CBCT) at the follow-up of 20.95±2.67 months after functional loading. The morphological parameters and possible factors associated with MBL were collected in a mean of 3.98±1.06 months at the early loading stage. All variables were analyzed using correlation and covariance matrices. Support vector machine (SVM), artificial neural network (ANN), logistic regression (LR) model and random forest (RF) were actualized to predict abnormal MBL. Results : At the early stage of functional loading, the abnormal MBL cases showed a significant increase of structure model index (SMI) and trabecular pattern factor (Tb.Pf) in peri-implant. Meanwhile, SMI and Tb.Pf simultaneously revealed a significantly high positive correlation with MBL. The LR model exhibited the best outcome in predicting MBL (AUC = 0.956), followed by SVM (AUC = 0.928), RF (AUC = 0.917), ANN (AUC = 0.900), SMI alone (AUC = 0.705) and Tb.Pf alone (AUC = 0.663). Compared with one single predictor, all algorithm models yielded significantly superior performance. Conclusion : Abnormal MBL cases demonstrated the premonitory morphological variation in trabecular bone at the early stage. MBL prediction could be achieved by machine learning methods.

scholarly journals The Mechanical Behaviors of Various Dental Implant Materials under Fatigue

2018 ◽  
Vol 2018 ◽  
pp. 1-10 ◽  
Author(s):  
Fatma Bayata ◽  
Cengiz Yildiz
Keyword(s):  
Surface Properties ◽  
Dental Implant ◽  
Mechanical Performance ◽  
Bone Structure ◽  
Von Mises Stress ◽  
Implant Design ◽  
Element Analysis ◽  
The Difference ◽  
Von Mises ◽  
Cp Ti

The selection of materials has a considerable role on long-term stability of implants. The materials having high resistance to fatigue are required for dental implant applications since these implants are subjected to cyclic loads during chewing. This study evaluates the performance of different types of materials (AISI 316L stainless steel, alumina and its porous state, CoCr alloys, yttrium-stabilized zirconia (YSZ), zirconia-toughened alumina (ZTA), and cp Ti with the nanotubular TiO2 surface) by finite element analysis (FEA) under real cyclic biting loads and researches the optimum material for implant applications. For the analysis, the implant design generated by our group was utilized. The mechanical behavior and the life of the implant under biting loads were estimated based on the material and surface properties. According to the condition based on ISO 14801, the FEA results showed that the equivalent von Mises stress values were in the range of 226.95 MPa and 239.05 MPa. The penetration analysis was also performed, and the calculated penetration of the models onto the bone structure ranged between 0.0037389 mm and 0.013626 mm. L-605 CoCr alloy-assigned implant model showed the least penetration, while cp Ti with the nanotubular TiO2 surface led to the most one. However, the difference was about 0.01 mm, and it may not be evaluated as a distinct difference. As the final numerical evaluation item, the fatigue life was executed, and the results were achieved in the range of 4 × 105 and 1 × 109 cycles. These results indicated that different materials showed good performance for each evaluation component, but considering the overall mechanical performance and the treatment process (implant adsorption) by means of surface properties, cp Ti with the nanotubular TiO2 surface material was evaluated as the suitable one, and it may also be implied that it displayed enough performance in the designed dental implant model.

Effect of Polylactic Acid/Hydroxyapatite Coating on Dental Implant Using Finite Element Method

2020 ◽  
Vol 995 ◽  
pp. 103-108
Author(s):  
Hassan Mas Ayu ◽  
M.M. Mustaqieem ◽  
Rosdi Daud ◽  
A. Shah ◽  
Andril Arafat ◽  
...  
Keyword(s):  
Finite Element ◽  
Stress Distribution ◽  
Dental Implant ◽  
Bonding Strength ◽  
Load Condition ◽  
Implant Design ◽  
Element Analysis ◽  
Improve Design

Finite element analysis (FEA) has been proven to be a precise and applicable method for evaluating dental implant systems. This is because FEA allows for measurement of the stress distribution inside of the bone and various dental implant designs via simulation analysis during mastication where such measurements are impossible to perform in-vitro or in-vivo experiment. That is why the relationship between implant design and load distribution at the implant bone interface is a crucial issue to understand. This research study focuses on a static simulation and bonding strength for PLA/HA coating on V thread design of dental implant using three-dimensional finite element. The average masticatory muscle that involves in human biting such as X, Y and Z direction will be used to simulate force with load condition of 17.1N, 114.6N and 23.4N respectively. Based on result obtained, the coated dental implant model is more compatible than uncoated model due to lower maximum stress which is reduce about 16%. The coated model also shows lower deformation and higher bonding strength. Outcomes from this research provide a better understanding of stress distribution characteristics that would be useful in order to improve design of dental implant thread and evaluation of the PLA/HA bonding strength applied.

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