Carlos Nelson Elias

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Comparison between different fracture toughness techniques in zirconia dental ceramics

Manuel Fellipe Rodrigues Pais Alves, Claudinei Santos, Carlos Nelson Elias, José Eduardo Vasconcellos Amarante, more

Journal of Biomedical Materials Research Part B: Applied Biomaterials > 111 > 1 > 103 - 116

Vickers indentation (IF) and single‐edge‐V‐notched beam (SEVNB), to measure the fracture toughness (K_IC) of zirconia‐based dental ceramics and mathematical models were proposed to establish a correlation between both. Zirconia (ZrO₂) stabilized with 3 mol. % of Y₂O₃ (3Y‐TZP) and 5 mol% of Y₂O₃ (5Y‐PSZ) were compacted (n = 42) and sintered for 2 h at different temperatures (1475°C, 1500°C, 1550°C,...

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Study of synthesis parameters on the physical properties and morphology of smart PNIPAAm hydrogels

Luiza Braga Ferreira dos Santos, Francielly Moura de Souza Soares, Emilia Santos Monteiro, Maria Elisa Rodrigues Coimbra, more

Materials Science Poland > 2022 > Vol. 40, No. 2 > 196--205

Bone loss is common in human old age and new materials that promote bone regeneration are an active line of research. In the present work, seven smart hydrogels based on PNIPAAm were synthesized with the prospective to be used in tissue engineering as a scaffold for bone growth. By changing the stoichiometric concentrations of the reagents and the synthesis parameters, hydrogels with different physical...

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Assessment of frictional resistance and surface roughness in orthodontic wires coated with two different nanoparticles

Ramiro Estacia Silveira, Carlos Nelson Elias, Flávia Lucisano Botelho Amaral

Microscopy Research and Technique > 85 > 5 > 1884 - 1890

Several mechanical and biological factors may change the orthodontic wire frictional resistance (FR). Titanium dioxide (TiO₂) and silica dioxide (SiO₂) nanoparticle (NP) coatings may be used to improve the characteristics of materials, reducing FR between archwire and bracket. This in vitro study aimed to evaluate the FR of orthodontic wires with and without coating in both dry and wet environments...

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Viability and collagen secretion by fibroblasts on titanium surfaces with different acid-etching protocols

Vilton Zimmermann Souza, Rafael Manfro, Júlio César Joly, Carlos Nelson Elias, more

International Journal of Implant Dentistry > 2019 > 5 > 1 > 1-6

Background From the consolidation of surface treatments of dental implants and knowledge on the cellular mechanisms of osseointegration, studies have highlighted the importance of a connective tissue seal against the implant to prevent contamination from the oral environment and consequent biofilm formation. Objective This in vitro study aimed to evaluate whether different titanium surface treatments...

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A novel hybrid nanoparticle based on Fe₃O₄/TMAOH/poly(L-co-D,L lactic acid-co-trimethylene carbonate) prepared through the solvent displacement method

Vagner Oliveira Machado, Ângela Leão Andrade, Luis Carlos Duarte Cavalcante, José Domingos Fabris, more

Hyperfine Interactions > 2019 > 240 > 1 > 1-10

TMAOH-dispersed nanoparticles of magnetite were first prepared through the reduction–precipitation of ferric chloride with Na₂SO₃ and NH₄OH. The TMAOH-dispersed (Fe₃O₄) magnetic nanoparticles were then surface-coated with poly(L-co-D,L lactic acid-co-trimethylene carbonate) (PLDLA-co-TMC) to obtain the corresponding hybrid system (Fe₃O₄/TMAOH/PLDLA-co-TMC). Samples of so prepared material were analyzed...

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Cyclic and Torsional Fatigue Resistance of XP-endo Shaper and TRUShape Instruments

Emmanuel João Nogueira Leal Silva, Victor Talarico Leal Vieira, Felipe Gonçalves Belladonna, Arthur de Siqueira Zuolo, more

Journal of Endodontics > 2018 > 44 > 1 > 168-172

The purpose of this study was to evaluate the cyclic and torsional fatigue resistance of the XP-endo Shaper (FKG Dentaire, La Chaux-de-Fonds, Switzerland) and TRUShape (Dentsply Tulsa Dental Specialties, Tulsa, OK) instruments.Twenty XP-endo Shaper (30/0.01) instruments and 20 TRUShape (30/0.06v) instruments were used. Cyclic fatigue resistance was tested by measuring the number of cycles and time...

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Extensiometric analysis of strain in craniofacial bones during implant-supported palatal expansion

Carlos Nelson Elias, Daniel Jogaib Fernandes, Denis Souza Zanivan, Yuri Resende Fonseca

Journal of the Mechanical Behavior of Biomedical Materials > 2017 > 76 > C > 104-109

Palatal expansion has several orthodontic and orthopedic applications, such as increasing maxillary transverse dimensions and correcting maxillary atresia, oral breathing, and skeletal cross-bites. Little is known about the strain to which craniofacial bones are submitted when a palatal expander is loaded. The objectives of the present work were to propose a new palatal bone-borne titanium device...

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Blue Thermomechanical Treatment Optimizes Fatigue Resistance and Flexibility of the Reciproc Files

Gustavo De-Deus, Emmanuel João Nogueira Leal Silva, Victor Talarico Leal Vieira, Felipe Gonçalves Belladonna, more

Journal of Endodontics > 2017 > 43 > 3 > 462-466

The aim of the present study was to evaluate the influence of Blue thermal treatment on the bending resistance and cyclic fatigue of conventional M-Wire Reciproc files (VDW, Munich, Germany). The roughness pattern and the microhardness of the files were also assessed.Flexibility of standard Reciproc R25 files and the corresponding Blue prototypes was determined by 45° bending tests according to the...

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Development of 70/30 Poly-l-dl-Lactic Acid Filaments for 3D Printers (Part 1): Filament Manufacturing and Characterization of Printed Samples for Use as Bioabsorbable Products

Daniel Jogaib Fernandes, Rafael Vidal, Luciana Portal Silva, Ricardo Pondé Weber, more

JOM > 2017 > 69 > 1 > 71-77

The aim of this work was to manufacture 70/30 poly-l-dl-lactic acid (PLDLLA) filaments for three-dimensional (3D) printers by using the extrusion technique and to study the properties of filaments and printed plates for surgical fracture stabilization. Different extrusion methodologies were tested and filaments were analyzed in terms of homogeneity, accuracy diameter, finishing surface morphology,...

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Surface analysis of 2 orthodontic mini-implants after clinical use

Guilherme Marigo, Carlos Nelson Elias, Marcelo Marigo

American Journal of Orthodontics and Dentofacial Orthopedics > 2016 > 150 > 1 > 89-97

The purpose of this study was to analyze the design and surface morphology of 2 brands of mini-implants before and after 12 to 18 months of clinical use.We studied 22 mini-implants sold in the Brazilian market by 2 companies (Forestadent, Pforzheim, Germany; and Dental Morelli, Sorocaba, São Paulo, Brazil). The surface morphology of the mini-implants was analyzed by scanning electron microscopy before...

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Mechanical Strength and Surface Roughness of Magnesium-Based Metallic Glasses

Daniel Jogaib Fernandes, Carlos Nelson Elias, Celso Renato Souza Resende, Claudemiro Bolfarini

JOM > 2017 > 69 > 7 > 1175-1184

This work evaluated the mechanical strength and surface roughness of MgZn₃₀Ca₅ ribbon manufactured via a melt spinning technique for applications in the biomedical field. Annealing was performed at 280°C. The inner side (in contact with the wheel) and the outer side (not in contact with the wheel) of the ribbons were mechanically evaluated using nanoindentation, and its surfaces were analyzed by an...

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Early Osseointegration Events on Neoss® ProActive and Bimodal Implants: A Comparison of Different Surfaces in an Animal Model

Gustavo Augusto Grossi‐Oliveira, Antonio Azoubel Antunes, Carlos Nelson Elias, Ann Wennerberg, more

Clinical Implant Dentistry and Related Research > 17 > 6 > 1060 - 1072

BackgroundCell interactions, adherence, and osseointegration at the bone‐implant interface can be directly influenced by the surface properties of the titanium implant. PurposeTo characterize osseointegration of Neoss® implants with conventional (control group) and hydrophilic (test group) surface treatments. Materials and MethodsSix Labrador dogs received Neoss implants with conventional and hydrophilic...

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Mechanical properties, surface morphology and stability of a modified commercially pure high strength titanium alloy for dental implants

Carlos Nelson Elias, Daniel Jogaib Fernandes, Celso R.S. Resende, Jochen Roestel

Dental Materials > 2015 > 31 > 2 > e1-e13

Commercially pure titanium (cp Ti) and Ti–6Al–4V (Ti G5) alloy have limitations for biomedical application, due to lower mechanical strength and the possibility of ion release, respectively. The purpose of this work was to compare the properties of a modified cp Ti grade 4 (Ti G4 Hard) with those of available cp Ti and Ti G5 alloys.Bars, discs and dental implants made with Ti G2, G4, G5 and G4 Hard...

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Natural Curaua Fiber-Reinforced Composites in Multilayered Ballistic Armor

Sergio Neves Monteiro, Luis Henrique Leme Louro, Willian Trindade, Carlos Nelson Elias, more

Metallurgical and Materials Transactions A > 2015 > 46 > 10 > 4567-4577

The performance of a novel multilayered armor in which the commonly used plies of aramid fabric layer were replaced by an equal thickness layer of distinct curaua fiber-reinforced composites with epoxy or polyester matrices was assessed. The investigated armor, in addition to its polymeric layer (aramid fabric or curaua composite), was also composed of a front Al₂O₃ ceramic tile and backed by an aluminum...

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Clinical Evaluation of Anodized Surface Implants Submitted to a Counter Torque of 25 Ncm After 60 Days of Osseointegration: Study in Humans

Rafael Manfro, Marcelo Carlos Bortoluzzi, Vinícius Fabris, Carlos Nelson Elias, more

Journal of Maxillofacial and Oral Surgery > 2015 > 14 > 1 > 1-6

Introduction Decreasing the time needed for osseointegration has always been a big challenge for modern implantodontics. The main factor which helps to decrease the time needed for osseointegration is the newly developed surfaces being used, as well as their microstructures, in relation to their osseoinductive properties. The aim of this work is to clinically evaluate the osseointegration of the...

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Degradation and Mechanical Properties of Zirconia 3‐Unit Fixed Dental Prostheses Machined on a CAD/CAM System

Carlos Nelson Elias, Andréa Matos Melo, Heraldo Elias Salomão dos Santos, Claudinei dos Santos

International Journal of Applied Ceramic Technology > 11 > 3 > 513 - 523

The manufacturing of ceramics fixed dental prostheses (FDPs) is not the same as that of standardized samples and, therefore, the surface finishing are not necessarily the same in both cases. Standardized samples and FDPs were sintered, polished, hydrothermally aged in saliva, and submitted to mechanical tests. The results showed a difference in bending strength between machined (911.19 MPa) and polished...

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Bending Resistance and Dynamic and Static Cyclic Fatigue Life of Reciproc and WaveOne Large Instruments

Gustavo De-Deus, Victor Talarico Leal Vieira, Emmanuel João Nogueira da Silva, Helio Lopes, more

Journal of Endodontics > 2014 > 40 > 4 > 575-579

The aim of the present study was to evaluate the bending resistance and the dynamic and static cyclic fatigue life of Reciproc R40 and WaveOne large instruments.A sample of 68 nickel-titanium instruments (25 mm in length) for use under reciprocation movement (Reciproc and WaveOne) from 3 different lots was tested. Reciproc R40 and WaveOne Large files, both of which had a nominal size of 0.40 mm at...

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Fatigue behavior of 3%Y2O3-doped ZrO2 ceramics

Renato Chaves Souza, Claudinei dos Santos, Miguel Justino Ribeiro Barboza, Luiz de Araujo Bicalho, more

Journal of Materials Research and Technology > 2014 > 3 > 1 > 48-54

The objective of this work was to evaluate the cyclic fatigue strength of a commercial pre-sintered tetragonal zirconia ceramics for dental systems, and to determine the main mechanical properties. Samples were sintered in air at 1600°C for 120min with heating and cooling rate of 10°C/min. The sintered specimens were characterized by X-ray diffraction and scanning electron microscopy. Hardness and...

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Ultrafine grained titanium for biomedical applications: An overview of performance

Carlos Nelson Elias, Marc André Meyers, Ruslan Z. Valiev, Sérgio Neves Monteiro

Journal of Materials Research and Technology > 2013 > 2 > 4 > 340-350

Ultrafine grain sized titanium (UFG Ti) obtained by severe plastic deformation presents a bright potential for biomedical applications because it provides the strength of titanium alloys without toxic alloying elements, such as Al and V that, by dissolving away from the implant, may be harmful to human health. The most recent developments and challenges in this field are reviewed. UFG Ti mini-devices...

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Nanostructured severe plastic deformation processed titanium for orthodontic mini-implants

Glaucio Serra, Liliane Morais, Carlos Nelson Elias, Irina P. Semenova, more

Materials Science & Engineering C > 2013 > 33 > 7 > 4197-4202

Titanium mini-implants have been successfully used as anchorage devices in Orthodontics. Commercially pure titanium (cpTi) was recently replaced by Ti-6Al-4V alloy as the mini-implant material base due to the higher strength properties of the alloy. However, the lower corrosion resistance and the lower biocompatibility have been lowering the success rate of Ti-6Al-4V mini-implants. Nanostructured...

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Search results for: Carlos Nelson Elias

Comparison between different fracture toughness techniques in zirconia dental ceramics

Study of synthesis parameters on the physical properties and morphology of smart PNIPAAm hydrogels

Assessment of frictional resistance and surface roughness in orthodontic wires coated with two different nanoparticles

Viability and collagen secretion by fibroblasts on titanium surfaces with different acid-etching protocols

A novel hybrid nanoparticle based on Fe₃O₄/TMAOH/poly(L-co-D,L lactic acid-co-trimethylene carbonate) prepared through the solvent displacement method

Cyclic and Torsional Fatigue Resistance of XP-endo Shaper and TRUShape Instruments

Extensiometric analysis of strain in craniofacial bones during implant-supported palatal expansion

Blue Thermomechanical Treatment Optimizes Fatigue Resistance and Flexibility of the Reciproc Files

Development of 70/30 Poly-l-dl-Lactic Acid Filaments for 3D Printers (Part 1): Filament Manufacturing and Characterization of Printed Samples for Use as Bioabsorbable Products

Surface analysis of 2 orthodontic mini-implants after clinical use

Mechanical Strength and Surface Roughness of Magnesium-Based Metallic Glasses

Early Osseointegration Events on Neoss® ProActive and Bimodal Implants: A Comparison of Different Surfaces in an Animal Model

Mechanical properties, surface morphology and stability of a modified commercially pure high strength titanium alloy for dental implants

Natural Curaua Fiber-Reinforced Composites in Multilayered Ballistic Armor

Clinical Evaluation of Anodized Surface Implants Submitted to a Counter Torque of 25 Ncm After 60 Days of Osseointegration: Study in Humans

Degradation and Mechanical Properties of Zirconia 3‐Unit Fixed Dental Prostheses Machined on a CAD/CAM System

Bending Resistance and Dynamic and Static Cyclic Fatigue Life of Reciproc and WaveOne Large Instruments

Fatigue behavior of 3%Y2O3-doped ZrO2 ceramics

Ultrafine grained titanium for biomedical applications: An overview of performance

Nanostructured severe plastic deformation processed titanium for orthodontic mini-implants

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