scholarly journals Effects of Positions and Angulations of Titanium Dental Implants in Biomechanical Performances in the All-on-Four Treatment: 3D Numerical and Strain Gauge Methods

Metals ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 280
Author(s):  
Aaron Yu-Jen Wu ◽  
Jui-Ting Hsu ◽  
Lih-Jyh Fuh ◽  
Heng-Li Huang
Keyword(s):  
Cortical Bone ◽  
Dental Implants ◽  
Dental Implant ◽  
Principal Strain ◽  
In Vitro Tests ◽  
Stress And Strain ◽  
In Vitro Experiments ◽  
Bone Stress ◽  
Bone Strains

In finite element (FE) simulations, the peak bone stresses were higher when loading with a cantilever extension (CE) than when loading without a CE by 33–49% in the cortical bone. In the in vitro experiments, the highest values of principal strain were all within the range of the minimum principal strain, and those peak bone strains were 40–58% greater when loading with a CE than when loading without a CE (p < 0.001). This study investigated how varying the implanted position and angulation of anterior implants in the All-on-Four treatment influenced the biomechanical environment in the alveolar bone around the dental implants. Ten numerical simulations of FE models and three in vitro samples of All-on-Four treatment of dental implants were created to investigate the effects of altering the implanted position and angulation type of anterior implants. A single load of 100 N was applied in the molar region in the presence or absence of a CE of the denture. The 3D FE simulations analyzed the von-Mises stresses in the surrounding cortical bone and trabecular bone. For the in vitro tests, the principal bone strains were recorded by rosette strain gauges and statistically evaluated using the Mann–Whitney U test and the Kruskal–Wallis test. Loading in the presence of a CE of the denture induced the highest bone stress and strain, which were 53–97% greater in the FE simulation and 68–140% in the in vitro experiments (p < 0.008) than when loading without a CE. The bone stresses in the FE models of various implanted positions and angulation types of anterior implants were similar to those in the model of a typical All-on-Four treatment. In vitro tests revealed that the bone strains were significantly higher in the samples with various angulation types of anterior implants (p < 0.008). In the All-on-Four treatment of dental implants, the bone stress and strain were higher when the load was applied to the CE of dentures. Altering the position or angulation of the anterior dental implant in the All-on-Four treatment has no benefit in relieving the stress and strain of the bone around the dental implant.

First titanium dental implants with white surfaces: Preparation and in vitro tests

2014 ◽  
Vol 30 (7) ◽  
pp. 759-768 ◽  
Author(s):  
Milena R. Kaluđerović ◽  
Joachim P. Schreckenbach ◽  
Hans-Ludwig Graf
Keyword(s):  
Dental Implants ◽  
In Vitro Tests ◽  
Titanium Dental Implants

scholarly journals Preparation of Bioactive Titanium Surfaces via Fluoride and Fibronectin Retention

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Carlos Nelson Elias ◽  
Patricia Abdo Gravina ◽  
Costa e Silva Filho ◽  
Pedro Augusto de Paula Nascente
Keyword(s):  
Dental Implants ◽  
Dental Implant ◽  
Osteoblastic Cells ◽  
Acid Etching ◽  
Implant Surface ◽  
Force Microscopy ◽  
Dental Implant Surface ◽  
Before And After ◽  
Titanium Surfaces

Statement of Problem. The chemical or topographic modification of the dental implant surface can affect bone healing, promote accelerated osteogenesis, and increase bone-implant contact and bonding strength.Objective. In this work, the effects of dental implant surface treatment and fibronectin adsorption on the adhesion of osteoblasts were analyzed.Materials and Methods. Two titanium dental implants (Porous-acid etching and PorousNano-acid etching followed by fluoride ion modification) were characterized by high-resolution scanning electron microscopy, atomic force microscopy, and X-ray diffraction before and after the incorporation of human plasma fibronectin (FN). The objective was to investigate the biofunctionalization of these surfaces and examine their effects on the interaction with osteoblastic cells.Results. The evaluation techniques used showed that the Porous and PorousNano implants have similar microstructural characteristics. Spectrophotometry demonstrated similar levels of fibronectin adsorption on both surfaces (80%). The association indexes of osteoblastic cells in FN-treated samples were significantly higher than those in samples without FN. The radioactivity values associated with the same samples, expressed as counts per minute (cpm), suggested that FN incorporation is an important determinant of thein vitrocytocompatibility of the surfaces.Conclusion. The preparation of bioactive titanium surfaces via fluoride and FN retention proved to be a useful treatment to optimize and to accelerate the osseointegration process for dental implants.

scholarly journals Comparative stability analysis of two types of CpTi and Zr-2.5% Nb implants after maxillofacial surgery

2017 ◽  
Vol 8 (2) ◽  
pp. 49-54
Author(s):  
Adel Pirjamalineisiani ◽  
Mohsen Sarafbidabad
Keyword(s):  
Cortical Bone ◽  
Dental Implants ◽  
Dental Implant ◽  
Maxillofacial Surgery ◽  
Simulation Method ◽  
Drilling Process ◽  
Element Analysis ◽  
Finite Element Analysis Simulation ◽  
Different Types ◽  
Implant Loading

Background. Improving the implantation conditions in order to reduce the failure is always desirable for researchers. The aim of this study was to compare two different types of dental implant materials from biomechnical viewpoint in order to introduce a novel simulation method to select suitable materials for dental implants. Methods. In this research, drilling process was performed in the cortical bone of the mandible by finite element analysis simulation. Then, a 3D model of the produced hole in the drilled site was derived and a dental implant model by ITI design was inserted into the cavity. The space remaining between the implant and cavity was considered as a newly formed cortical bone area. Implant loading was performed on two dental implants with different types of material. The change in the volume of the cortical bone around each implant was considered a criterion for evaluating bone damage. Additionally, the micromotion of dental implant in the mandible after implantation was used for investigating dental implant stability. Results. After implant loading, the volume changes in newly formed cortical bone around Ti and Zr-2.5%Nb dental implants were measured at 0.010809 and 0.010996 mm3 , respectively. Furthermore, micromotion of Ti and Zr-2.5%Nb dental implants were measured at 0.00514 and 0.00538 mm, respectively. Conclusion. This study showed that Ti dental implant creates better conditions than Zr-2.5%Nb dental implant in the maxillofacial region

scholarly journals Rabbits as Animal Models in Contemporary Implant Biomaterial Research

2011 ◽  
Vol 2 (2) ◽  
pp. 129-134 ◽  
Author(s):  
Himanshu Arora ◽  
Anil Nafria ◽  
Anup Kanase
Keyword(s):  
Animal Models ◽  
Dental Implants ◽  
Dental Implant ◽  
Mechanical Stability ◽  
In Vitro Studies ◽  
Clinical Use ◽  
Essential Step ◽  
Rigorous Testing

ABSTRACT Development of an optimal interface between bone and orthopedic or dental implants has taken place for many years. In order to determine whether a newly developed implant material conforms to the requirements of biocompatibility, mechanical stability and safety, it must undergo rigorous testing both in vitro and in vivo. Results from in vitro studies can be difficult to extrapolate to the in vivo situation. For this reason the use of animal models is often an essential step in the testing of orthopedic and dental implants prior to clinical use in humans. This review discusses the reasons, the importance, and the research carried out in rabbits in our quest to develop a dental implant ideally suited for human bone.

In Vitro Evaluation of the Removal Force of Abutments in Frictional Dental Implants

2011 ◽  
Vol 37 (5) ◽  
pp. 519-523 ◽  
Author(s):  
João César Zielak ◽  
Murilo Rorbacker ◽  
Rodrigo Gomes ◽  
Celso Yamashita ◽  
Carla Castiglia Gonzaga ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Body Weight ◽  
Dental Implants ◽  
Dental Implant ◽  
Compression Force ◽  
Implant Abutment ◽  
Frictional System ◽  
Different Diameters ◽  
The Impact

The objective of the present work was to determine some force parameters for removal of an abutment from a dental implant in a frictional system (locking taper, 1.23 degrees). Ten implants of the same length (11 mm) and different diameters were selected, along with 10 straight abutments (13 mm length) with different diameters. Abutments were attached to implants without application of force. Fixation of the implant-abutment mount (IA) (repeated 1–5 times) was performed through the impact of a body weight (compression force, tapping) left from a known height. After each group of tappings, IA mounts were coupled with a tensile strength tester. The lowest removal value was found after the first tapping of mount #2 (83 N, implant diameter 3.3 mm/4.5 mm abutment diameter), and the highest removal value happened with mount #8 after the fifth tapping (420 N, 5.0 mm/5.5 mm). The force to remove IA mounts increased with the number of tappings and with the increase in abutment mass. Three activations (tappings) of the abutment were considered necessary to yield optimal stability, demonstrated by the large increase in removal force.

scholarly journals Location of the Mandibular Canal and Thickness of the Occlusal Cortical Bone at Dental Implant Sites in the Lower Second Premolar and First Molar

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Jui-Ting Hsu ◽  
Heng-Li Huang ◽  
Lih-Jyh Fuh ◽  
Rou-Wei Li ◽  
Jay Wu ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Statistical Analysis ◽  
Cortical Bone ◽  
Dental Implants ◽  
Dental Implant ◽  
Cone Beam Computed Tomography ◽  
Statistical Difference ◽  
Mandibular Canal ◽  
Careful Consideration ◽  
Cone Beam

The objective of this study was to evaluate the location of the mandibular canal and the thickness of the occlusal cortical bone at dental implant sites in the lower second premolar and lower first molar by using dental cone-beam computed tomography (CBCT). Seventy-nine sites (47 second premolar and 32 first molar sites) were identified in the dental CBCT examinations of 47 patients. In this study, 4 parameters were measured: (1) MC—the distance from the mandibular canal to the upper border of the mandible; (2) CD—the distance from the mandibular canal to the buccal border of the mandible; (3) MD—the distance from the mandibular canal to the lingual border of the mandible; (4) TC—the thickness of the cortical bone at the occlusal side. A statistical analysis was employed to compare the size and differences between these 4 parameters at the lower second premolar and lower first molar. Regarding the MC and MD, the experimental results showed no statistical difference between the first molar and second premolar. However, the TC for the second premolar was greater than that of the first molar. Thus, careful consideration is necessary in choosing the size of and operation type for dental implants.

An in vitro biofilm model associated to dental implants: Structural and quantitative analysis of in vitro biofilm formation on different dental implant surfaces

2014 ◽  
Vol 30 (10) ◽  
pp. 1161-1171 ◽  
Author(s):  
M.C. Sánchez ◽  
A. Llama-Palacios ◽  
E. Fernández ◽  
E. Figuero ◽  
M.J. Marín ◽  
...  
Keyword(s):  
Quantitative Analysis ◽  
Dental Implants ◽  
Dental Implant ◽  
Biofilm Formation ◽  
Biofilm Model

IN VITRO STUDY AND MECHANICAL CHARACTERISTICS OF DENTAL IMPLANTS MADE OF VARIOUS MATERIALS AND FABRICATION METHODS

2021 ◽  
Vol 21 (01) ◽  
pp. 2150004
Author(s):  
MEHDI MASHHADI ◽  
REZA HAMZELOO ◽  
MEGHDAD FALLAH
Keyword(s):  
Dental Implants ◽  
Surface Hardness ◽  
In Vitro Study ◽  
Surface Characteristics ◽  
Topology Design ◽  
In Vitro Tests ◽  
Implant Surface ◽  
Experimental Surface ◽  
Hardness Values

Selecting materials and alloys, fabrication methods, surface characteristics and coatings, and topology design, all affect the mechanical properties, biocompatibility, and functionality of dental implants. The success in embedding implants in mouth and improving biocompatibility and consequently useful life of implants depends directly on proper adhesion of tissue to implant surface of a biocompatible alloy. In this research, experimental surface hardness and in vitro tests are carried out on samples with different alloys and different manufacturing methods. Various fabrication techniques, such as machining and 3D printing (Selective laser melting (SLM)), are considered for steel and titanium specimens. Results show that the hardness values of specimens made by the SLM method are higher than machined samples about 8% and also stainless steels samples have higher hardness than titanium specimens. A comparison of scanning electron microscopy (SEM) surface pictures indicates that applying modern fabrication methods for production which includes SLM improves the performance of implants in terms of mechanical and biocompatibility by increasing cell adhesion up to 21 times. In addition, results indicate that titanium alloys have almost 13% higher adhesion property than stainless steel and generally exhibit a higher balance of adhesion and cell growth.

scholarly journals Experimental Evaluation of Dental Implant Biomechanics Given Certain Stages of the Fixing Substrate Deterioration by Video Image Correlation Method

2015 ◽  
Vol 61 (3) ◽  
pp. 192-195
Author(s):  
Száva Dániel Tamás ◽  
Száva Ioan ◽  
Gálfi Botond ◽  
Iacob Alina ◽  
Petrovan Cecilia ◽  
...  
Keyword(s):  
Dental Implants ◽  
Dental Implant ◽  
Strain Distribution ◽  
Plastic Material ◽  
Video Image ◽  
Image Correlation ◽  
Osseous Tissue ◽  
Oral Rehabilitation ◽  
Geometrical Properties

AbstractBackground: Dental implants are useful tools and represent a widely spread technique for oral rehabilitation. Their long standingness is highly influenced by the mechanical and geometrical properties of the surrounding osseous tissue in which they are placed. In some unsuccessful cases though, the dental implant is exposed to masticatory forces and other functional acts, and osseous tissue may resorb near its vicinity, leading to the dental implants loss. We investigated the strain distribution inside the fixating substrate, given certain stages of its deterioration near the dental implants.Material and methods: For our investigations we used cilindro-conical screw-type dental which were submitted to vertical forces between 0-1000 N. The dental implants were fixed inside a plastic material used in photo-elastic measurements.To evaluate the strain distribution inside the fixing substrate, we used a non-contact, experimental investigation tool, the Video Image Correlation (VIC-3D) optical system. This system allows the implementation in the dental implants optimisation from stress-strain state point of view.Results: The strain field distribution inside the fixating substrate was measured at three different levels of the dental implant, when it was loaded alone and in the case when there were loaded two dental implants simultaneously.Conclusions: The most stresses are concentrated in the neck-area of the dental implant. If there are loaded two or more dental implants simultaneously, the distance between them influences strain distribution. The measurements were conducted in vitro and do not represent the in vivo conditions, but serve further important facts regarding biomechanical properties of dental implants.

scholarly journals GEOMETRICAL OPTIMIZATION OF DENTAL IMPLANTS WITH REGARD TO OSSEOINTEGRATION

2017 ◽  
Vol 13 ◽  
pp. 97
Author(s):  
Luboš Řehounek ◽  
František Denk ◽  
Aleš Jíra
Keyword(s):  
Numerical Simulations ◽  
Cortical Bone ◽  
Dental Implants ◽  
Dental Implant ◽  
Local Stress ◽  
Cylindrical Part ◽  
Von Mises Stress ◽  
Stress Concentrations ◽  
Anchoring System ◽  
Von Mises

A newly developed reference dental implant specimen type was subjected to numerical simulations of osseointegration. The goal of these tests was to optimize the geometry of the implant so as to reduce local stress concentrations and provide a better flow of stress through the whole implant body. Conditions for osseointegration were considered when evaluating the anchoring system of the implant in regard to its placement in the human cancellous and cortical bone. Numerical simulations showed that stress concentrations occur mostly in the upper cylindrical part of the implant. By increasing the width of this cylindrical part, we were able to reduce the maximum values of von-Mises stress by 20 %.

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