scholarly journals Influence of the Elastic Modulus on the Osseointegration of Dental Implants

Materials ◽  
2019 ◽  
Vol 12 (6) ◽  
pp. 980 ◽  
Author(s):  
Aritza Brizuela ◽  
Mariano Herrero-Climent ◽  
Elisa Rios-Carrasco ◽  
Jose Rios-Santos ◽  
Roman Pérez ◽  
...  
Keyword(s):  
Elastic Modulus ◽  
Dental Implants ◽  
Elastic Moduli ◽  
Load Transfer ◽  
Testing Machine ◽  
Point Of View ◽  
Metallic Prosthesis ◽  
Commercially Pure ◽  
Universal Testing ◽  
Low Modulus

The load transfer from metallic prosthesis to tissue plays an important role in the success of a designed device. From a mechanical behavior point of view, the load transfer will be favored when the elastic modulus between the metallic implant and the bone tissue are similar. Titanium and Ti-6Al-4V are the most commonly used metals and alloys in the field of dental implants, although they present high elastic moduli and hence trigger bone resorption. We propose the use of low-modulus β-type titanium alloys that can improve the growth of new bone surrounding the implant. We designed dental implants with identical morphology and micro-roughness composed of: Ti-15Zr, Ti-19.1Nb-8.8Zr, Ti-41.2Nb-6.1Zr, and Ti-25Hf-25Ta. The commercially pure Ti cp and Ti-6Al-4V were used as control samples. The alloys were initially mechanically characterized with a tensile test using a universal testing machine. The results showed the lowest elastic modulus for the Ti-25Hf-25Ta alloy. We implanted a total of six implants in the mandible (3) and maxilla (3) for each titanium alloy in six minipigs and evaluated their bone index contact (i.e., the percentage of new bone in contact with the metal—BIC%) after 3 and 6 weeks of implantation. The results showed higher BIC% for the dental implants with lowest elastic modulus, showing the importance of decreasing the elastic modulus of alloys for the successful osseointegration of dental implants.

scholarly journals Flexural Properties and Elastic Modulus of Different Esthetic Restorative Materials: Evaluation after Exposure to Acidic Drink

2019 ◽  
Vol 2019 ◽  
pp. 1-8 ◽  
Author(s):  
Andrea Scribante ◽  
Marco Bollardi ◽  
Marco Chiesa ◽  
Claudio Poggio ◽  
Marco Colombo
Keyword(s):  
Elastic Modulus ◽  
Flexural Strength ◽  
Water Immersion ◽  
Testing Machine ◽  
Distilled Water ◽  
Resin Composites ◽  
Restorative Material ◽  
Universal Testing ◽  
Restorative Materials ◽  
Acidic Beverages

Background. Acidic beverages, such as soft drinks, can produce erosion of resin composites. The purpose of the present study was to investigate mechanical properties of different esthetic restorative materials after exposure to acidic drink. Methods. Nine different composites were tested: nanofilled (Filtek Supreme XTE, 3M ESPE), microfilled hybrid (G-ænial, GC Corporation), nanohybrid Ormocer (Admira Fusion, Voco), microfilled (Gradia Direct, GC Corporation), microfilled hybrid (Essentia, GC Corporation), nanoceramic (Ceram.X Universal, Dentsply De Trey), supranano spherical hybrid (Estelite Asteria, Tokuyama Dental Corporation), flowable microfilled hybrid (Gradia Direct Flo, GC Corporation), and bulk fill flowable (SureFil SDR flow, Dentsply De Trey). Thirty specimens of each esthetic restorative material were divided into 3 subgroups (n=10): specimens of subgroup 1 were used as control, specimens of subgroup 2 were immersed in 50 ml of Coca Cola for 1 week, and specimens of subgroup 3 were immersed in 50 ml of Coca Cola for 1 month. Flexural strength and elastic modulus were measured for each material with an Instron Universal Testing Machine. Data were submitted to statistical analysis. Results. After distilled water immersion, nanofilled composite showed the highest value of both flexural strength and elastic modulus, but its flexural values decreased after acidic drink immersion. No significant differences were reported between distilled water and acidic drink immersion for all other materials tested both for flexural and for elastic modulus values. Conclusions. Even if nanofilled composite showed highest results, acidic drink immersion significantly reduced flexural values.

Study on the Performances and Interfacial Structure of Magnesium Hydroxide Whiskers/ABS Composites

2011 ◽  
Vol 109 ◽  
pp. 46-50
Author(s):  
Yu Zhi Jiang ◽  
Li Li Zhang ◽  
Yan Bo Li
Keyword(s):  
Tensile Strength ◽  
Elastic Modulus ◽  
Magnesium Hydroxide ◽  
Testing Machine ◽  
Surface Modifications ◽  
Interfacial Structure ◽  
Melt Extrusion ◽  
Elongation At Break ◽  
Universal Testing ◽  
Mechanical Performances

The magnesium hydroxide (MH) whiskers / ABS composites were prepared by melt-extrusion with modified whiskers as filler. The mechanical performances, including the tensile strength, elongation at break and elastic modulus, were tested by electronic universal testing machine. The results showed that with the increasing of the whisker dosage, the tensile strength and elongation at break reduced gradually, and the elastic modulus get maximum when it is 25%.The morphology on fracture of composites was analyzed by SEM. The conclusions are the whiskers of surface modifications can be evenly distributed in the composites and bond partly with ABS. that it is necessary to enhance the combine strength of interface on excellence performances of composites.

scholarly journals PULL AND BENDING FORCE USING FIBERGLASS WR EPOXY COMPOSITE MATERIALS AND FIBER CARBON EPOXY

Vortex ◽  
2021 ◽  
Vol 2 (1) ◽  
pp. 1
Author(s):  
Alphario Rachmatino Yudiana
Keyword(s):  
Elastic Modulus ◽  
Composite Materials ◽  
Carbon Fiber ◽  
Epoxy Composite ◽  
Testing Machine ◽  
Maximum Load ◽  
Average Value ◽  
Bending Force ◽  
Universal Testing ◽  
College Of Technology

Bending testing is carried out in the lab. Nurtanio Adisutjipto College of Technology Yogyakarta uses the Gotech Testing Machine INC (Universal Testing Machine) UTM testing machine where the results obtained in the test are in the form of a graphic in which the maximum load value, elastic modulus, area, yield point and span have been obtained. From the results of these tests, we can compare the average value of the maximum load and the modulus of elasticity received in each specimen with variations in carbon fiber and WR fiberglass.

scholarly journals Evaluation of Mechanical Properties and Marginal Fit of Crowns Fabricated Using Commercially Pure Titanium and FUS-Invest

2017 ◽  
Vol 2017 ◽  
pp. 1-9 ◽  
Author(s):  
Jinshuang Wu ◽  
Xianli Wang ◽  
Helin Xing ◽  
Tianwen Guo ◽  
Chaofang Dong ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Testing Machine ◽  
Pure Titanium ◽  
Commercially Pure Titanium ◽  
Marginal Fit ◽  
Commercially Pure ◽  
Universal Testing ◽  
Single Crown ◽  
Significant Difference ◽  
Internal Fit

This study investigated the mechanical properties and single crown accuracy of the tailor-made Fourth University Stomatology investment (FUS-invest) for casting titanium. Background. Current investment for casting titanium is not optimal for obtaining high-quality castings, and the commercially available titanium investment is costly. Methods. Titanium specimens were cast using the tailor-made FUS-invest. The mechanical properties were tested using a universal testing machine. Fractured castings were characterized by energy-dispersive spectroscopy. 19 titanium crowns were produced using FUS-invest and another 19 by Symbion. The accuracy of crowns was evaluated. Results. The mechanical properties of the titanium cast by FUS-invest were elastic modulus 125.6 ± 8.8 GPa, yield strength 567.5 ± 11.1 MPa, tensile strength 671.2 ± 15.6 MPa, and elongation 4.6 ± 0.2%. For marginal fit, no significant difference (P>0.05) was found at four marker points of each group. For internal fit, no significant difference (P>0.05) was found between two groups, whereas significant difference (P<0.01) was found at different mark point of each group. Conclusions. The mechanical properties of titanium casted using FUS-invest fulfilled the ISO 9693 criteria. The marginal and internal fit of the titanium crowns using either the FUS-invest or Symbion were similar.

scholarly journals Proposal of Design Formulae for Equivalent Elasticity of Masonry Structures Made with Bricks of Low Modulus

2017 ◽  
Vol 2017 ◽  
pp. 1-11 ◽  
Author(s):  
Muhammad Ridwan ◽  
Isamu Yoshitake ◽  
Ayman Y. Nassif
Keyword(s):  
Elastic Modulus ◽  
Modulus Of Elasticity ◽  
Elastic Moduli ◽  
Masonry Structures ◽  
Quadrilateral Elements ◽  
Fe Simulations ◽  
Low Elastic Modulus ◽  
Low Modulus ◽  
Equivalent Modulus ◽  
Simplified Formula

Bricks of low elastic modulus are occasionally used in some developing countries, such as Indonesia and India. Most of the previous research efforts focused on masonry structures built with bricks of considerably high elastic modulus. The objective of this study is to quantify the equivalent elastic modulus of lower-stiffness masonry structures, when the mortar has a higher modulus of elasticity than the bricks, by employing finite element (FE) simulations and adopting the homogenization technique. The reported numerical simulations adopted the two-dimensional representative volume elements (RVEs) using quadrilateral elements with four nodes. The equivalent elastic moduli of composite elements with various bricks and mortar were quantified. The numerically estimated equivalent elastic moduli from the FE simulations were verified using previously established test data. Hence, a new simplified formula for the calculation of the equivalent modulus of elasticity of such masonry structures is proposed in the present study.

Study on the Mechanical Properties of ABS Enhanced by Magnesium Hydroxide Whiskers

2013 ◽  
Vol 300-301 ◽  
pp. 1289-1292
Author(s):  
Yu Zhi Jiang ◽  
Li Li Zhang ◽  
Zhong Yang Zhang ◽  
Li Hua Wang
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Elastic Modulus ◽  
Magnesium Hydroxide ◽  
Fracture Strength ◽  
Testing Machine ◽  
Fracture Morphology ◽  
Total Elongation ◽  
Zinc Stearate ◽  
Universal Testing

magnesium hydroxide whiskers; ABS; mechanical properties Abstract: The magnesium hydroxide (MH) whiskers/ABS composites were prepared by melt-extrusion with whiskers as fillers. Zinc stearate was used as modifier to improve the compatibility of the composites. The mechanical properties of ABS enhanced by different cotents of magnesium hydroxide whiskers were tested by the RGT-10 universal testing machine. When the content of whiskers was 10%, The comprehensive mechanical properties of the composites were the best, the max load was 0.30KN, the elastic modulus was 0.16Gpa, the tensile strength was 20.11Mpa, the total elongation was 10.24%, the fracture strength was 2.05Mpa. The fracture morphology of the composites was analyzed by SEM, the higher contents of magnesium hydroxide whisker, the worse-distributed whisker in ABS matrix.

Retention of Implant-Supported Overdenture With Bar/Clip and Stud Attachment Designs

2013 ◽  
Vol 39 (2) ◽  
pp. 140-147 ◽  
Author(s):  
Omid Savabi ◽  
Farahnaz Nejatidanesh ◽  
Forough Yordshahian
Keyword(s):  
Dental Implants ◽  
Analysis Of Variance ◽  
Testing Machine ◽  
Type Number ◽  
Universal Testing Machine ◽  
Crosshead Speed ◽  
Average Value ◽  
Metal Clip ◽  
Universal Testing

The degree of retention for overdenture attachments depends on design, location, and alignment of supporting dental implants and the type of attachments. The aim of this study was to evaluate the retention of an implant-supported overdenture with different attachment designs. An overdenture was made on an edentulous mandibular model with 2 ITI implants (4.1 × 10 mm) in the symphyseal region. Five specimens of 8 attachment designs with corresponding abutments and superstructures were used: ITI regular Dolder bar with 1 metal clip, ITI regular Dolder bar with cantilever and 3 metal clips, Hader bar with 1 plastic clip, Hader bar with cantilever and 3 plastic clips, Sphero block abutment with Rhein plastic caps (green, white, and pink), and retentive anchor with ITI elliptical matrix. The attachments' housings were interchangeable and fixed into the overdenture through nut and screw. The overdenture attachments were subjected to 8 consecutive pulls on a universal testing machine with a crosshead speed of 50.8 mm/min in the vertical and posteroanterior directions. Analysis of variance and Duncan tests were used to determine differences between mean retention values (α = .05). The highest average value retention was recorded for the ITI Dolder bar with cantilever and 3 metal clips in both the vertical and posteroanterior directions, respectively (P &lt; .05). The Rhein pink caps had the lowest retention in the posteroanterior direction (P &lt; .05). Retention decreased over the course of consecutive pulls for all attachments in both directions. The type, number, and placement of attachments affect the retention of implant-supported mandibular overdentures.

Study on the Performances and Interfacial Structure of Magnesium Oxysulfate Whiskers/PE Composites

2010 ◽  
Vol 158 ◽  
pp. 219-223 ◽  
Author(s):  
Yu Zhi Jiang ◽  
Yan Bo Li
Keyword(s):  
Hydrogen Bond ◽  
Tensile Strength ◽  
Elastic Modulus ◽  
Modulus Of Elasticity ◽  
Testing Machine ◽  
Interfacial Structure ◽  
Elongation At Break ◽  
Universal Testing ◽  
Magnesium Oxysulfate ◽  
Mechanical Performances

The magnesium oxysulfate whiskers/PE composites were prepared by melt-extrusion using whiskers as filler. The mechanical performances, including the tensile strength, elongation at break and elastic modulus, were tested by electronic universal testing machine. The results show that as the content of whiskers increases, the modulus of elasticity increases while the elongation decreases. However, the elastic modulus will improve and the tensile strength will be maximized when it is 15%. Hydrogen bond was formed between whisker and modifier after modification and was characterized by IR. The morphology of fracture was analyzed by SEM. It draws the conclusion that hydrogen bond is capable to enhance the mechanical performances of composites.

Crush Response of Polyurethane Foam-Filled Aluminium Tube Subjected to Axial Loading

2014 ◽  
Vol 875-877 ◽  
pp. 534-541 ◽  
Author(s):  
Chawalit Thinvongpituk ◽  
Nirut Onsalung
Keyword(s):  
Energy Absorption ◽  
Polyurethane Foam ◽  
Testing Machine ◽  
Axial Loading ◽  
Asymmetric Mode ◽  
Pu Foam ◽  
Universal Testing ◽  
Collapse Mode ◽  
Empty Tube ◽  
Foam Filled

In this paper, the experimental investigation of polyurethane (PU) foam-filled into circular aluminum tubes subjected to axial crushing was presented. The purpose of this study is to improve the energy absorption of aluminium tube under axial quasi-static load. The aluminium tube was made from the AA6063-T5 aluminium alloy tubes. Each tube was filled with polyurethane foam. The density of foam was varied from 100, 150 and 200 kg/mP3P including with empty tube. The range of diameter/thickness (D/t) ratio of tube was varied from 15-55. The specimen were tested by quasi-static axial load with crush speed of 50 mm/min using the 2,000 kN universal testing machine. The load-displacement curves while testing were recorded for calculation. The mode of collapse of each specimen was analyzed concerning on foam density and the influence of D/t ratio. The results revealed that the tube with foam-filled provided significantly increment of the energy absorption than that of the empty tube. While the density of foam and D/t ratios increase, the tendency of collapse mode is transformed from asymmetric mode to concertina mode.

scholarly journals Cytocompatibility of Ti–xZr alloys as dental implant materials

2021 ◽  
Vol 32 (5) ◽  
Author(s):  
Pinghua Ou ◽  
Cong Hao ◽  
Jue Liu ◽  
Rengui He ◽  
Baoqi Wang ◽  
...  
Keyword(s):  
Elastic Modulus ◽  
Pure Titanium ◽  
Dead Cell ◽  
Commercially Pure Titanium ◽  
Modulus Ratio ◽  
High Mechanical Strength ◽  
Commercially Pure ◽  
Low Elastic Modulus ◽  
Cell Assays ◽  
Osteogenic Induction

AbstractTi–xZr (x = 5, 15, 25, 35, 45% wt%) alloys with low elastic modulus and high mechanical strength were fabricated as a novel implant material. The biocompatibility of the Ti–xZr alloys was evaluated by osteoblast-like cell line (MG63) in terms of cytotoxicity, proliferation, adhesion, and osteogenic induction using CCK-8 and live/dead cell assays, electron microscopy, and real-time PCR. The Ti–xZr alloys were non-toxic and showed superior biomechanics compared to commercially pure titanium (cpTi). Ti–45Zr had the optimum strength/elastic modulus ratio and osteogenic activity, thus is a promising to used as dental implants.

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