Commercially pure titanium (Ti G2 and Ti G4) the Ti–6Al–4V G5) alloy have limitations for biomedical applications, due to either low mechanical strength G2, or possible release of toxic ions G5). Since alloys a hardening coefficient, it is very difficult improve their properties by work hardening. The purpose this was compare clinical G4 nanostructured after severe plastic deformation ECAP Hard) with those G5. Bars, disks dental implants made G4, G5 Hard were tested. Mechanical tests...

Nickel-titanium (NiTi) shape-memory alloys (SMAs) have been used in the manufacture of orthodontic wires due to their shape memory properties, super-elasticity, high ductility, and resistance corrosion. SMAs greater strength lower modulus elasticity when compared with stainless steel alloys. The pseudoelastic behavior NiTi means that on unloading they return original by delivering light continuous forces over a wider range deformation which is claimed allow dental displacements. aim this...

The demand for joint replacement and other orthopedic surgeries involving titanium implants is continuously increasing; however, 1%-2% of result in costly devastating implant associated infections (IAIs). Pseudomonas aeruginosa Staphylococcus aureus are two common pathogens known to colonise implants, leading serious complications. Bioinspired surfaces with spike-like nanotopography have previously been shown kill bacteria upon contact; the longer-term potential such prevent or delay biofilm...

The demand for medical implants globally has increased significantly due to an aging population amongst other reasons. Despite the overall increase in survivorship of Ti6Al4V implants, implant infection rates are increasing factors such as diabetes, obesity, and bacterial resistance antibiotics. Two commonly found bacteria implicated infections Staphylococcus aureus Pseudomonas aeruginosa. Based on prior work that showed nanostructured surfaces might have potential passively killing these...

The use of materials for biomedical applications has become vital to enhance the quality life and longevity human beings. Commercially pure titanium (cpTi) alloys are most adequate some applications, but cpTi Ti-6Al-4V alloy (Ti G5) have limitations application due low mechanical strength possibility ion release, respectively. In order address this problem, commercially ultrafine grained (UFG Ti) obtained by severe plastic deformation (SPD) been suggested as a promising alternative...

Avian eggshells may break easily when impacted at a localized point; however, they exhibit impressive resistance subjected to well-distributed compressive load. For example, common demonstration of material strength is firmly squeezing chicken egg along its major axis between one's hands without breaking it. This research provides insight into the underlying mechanics by evaluating both macroscopic and microstructural features. Eggs different size, varying from quail (30 mm) ostrich (150...

Orthodontic implants have become a reliable method in orthodontic practice for providing temporary additional anchorage. These devices are useful to control skeletal anchorage less compliant patients or cases where absolute is necessary. There great number of advantages this new approach which include easy insertion, decreased patient discomfort, low price, immediate loading, reduced diameter, versatility the forces be used, ease cleaning, and removal. However, proper management screws by...

Abstract Objective: To evaluate the force extension relaxation of different manufacturers and diameters latex elastics subjected to static tensile testing under dry wet conditions. Materials Methods: Sample sizes 15 from American Orthodontics (AO) (Sheboygan, Wis), TP (La Porte, Ind), Morelli (Sorocaba SP, Brazil) were used. Equivalent medium products tested—3/16, 1/4, 5/16 inch lumen size each manufacturer—making a total 1080 specimens. An apparatus was designed simulate oral environments...

The objective of this study was to assess the influence cortical thickness and bone density on insertion torque a mini-implant (MI) with microthreads. Mini-implants lengths 6 8 mm in active part were inserted into synthetic blocks (polyurethane resin). these 20 pounds per cubic foot (pcf), simulating marrow, that 1, 2, 3-mm-thick 40 pcf, bone. Blocks uniform pcf also used simulate areas greater density. Insertion quantified universal testing machine (EMIC). For both MIs, increasing...

The purpose of this work was to study the influence screw length and bone thickness on stability temporary implants. A total 96 self-drilling screws with two different lengths were inserted into polyurethane blocks (n = 66), bovine femurs 18) rabbit tibia 12) cortical thicknesses (1 8 mm). Screws insertion in assisted by a universal testing machine, torque peaks collected digital torquemeter monitored micro-CT. results showed that significantly increased from (p < 0.0001), 0.0035) 0.05)...

INTRODUCTION: The shear bond strength of orthodontic brackets bonded to micro-hybrid and micro-particulate resins under different surface treatment methods was assessed. METHODS: Two hundred eighty test samples were divided into 28 groups (n = 10), where 140 specimens filled with Durafill resin Charisma composite. In samples, a coupling agent (silane) applied. were: Phosphoric hydrofluoric acid etching, sodium bicarbonate aluminum oxide blasting, stone burs. A Universal Instron Machine used...

Abstract Over the last decades, much research has been done to improve surface quality of dental implants, but there was no change in materials used manufacture implants. The purpose present work is compare compressive strength and fatigue failure implants made with a new material, nanocrystalline Ti grade 4 fabricated by Equal Channel Angular Pressing (ECAP) (Ti Hard) traditional microcrystalline G4). Machined screw‐shaped three different designs (Easy, Torq Flash) two were subjected static...

The purpose of the present work is to compare mechanical properties commercially available NiTi orthodontic archwires lots. Superelastic (SE) and heat-activated (HA) from two lots six manufacturers (3M, GAC, Tp, Orthosource, Orthometric Morelli) were partitioned into eleven groups (n=132) tested under three-point bending tests. difference between highest (151.35 gf, Tp) lowest (98.43 3M) unloading stresses among SE was 53.77% (p<.05), while Tp Orthosource HA group 168.20% (p<.05). Between...

To evaluate force extension relaxation of different brands and diameters latex elastics subjected to static tensile testing under an apparatus designed simulate oral environments, sample sizes 5 from American Orthodontics (AO), Tp, Morelli (Mo) equivalent medium force, (3/16, 1/4, 5/16 inch size) were tested. The forces read after 1-, 3-, 6-, 12- 24-hour periods in Emic machine with 30 mm/min cross-head speed load cell 20 N. Two-way ANOVA Bonferroni tests used identify statistical...

OBJECTIVE: This study aimed to measure insertion torque, tip mechanical resistance fracture and transmucosal neck of mini-implants (MI) (Conexão Sistemas de PróteseT), as well analyze surface morphology. METHODS: Mechanical tests were carried out the torque MIs in different cortical thicknesses, MIs. Surface morphology was assessed by scanning electron microscopy (SEM) before after tests. RESULTS: Values (22.14 N.cm 54.95 N.cm) higher statistically (P &lt; 0.05) from values for 1-mm (7.60...

INTRODUÇÃO: os braquetes autoligáveis foram, inicialmente, idealizados com objetivo de otimização do tempo atendimento clínico. Por dispensar qualquer tipo amarração, inúmeras vantagens foram atribuidas a este sistema, redução da fricção superficial na interface braquete/fio ortodôntico. Com esta redução, são necessárias forças menor intensidade para o estabelecimento movimentação dentária, realizada, assim, uma forma mais rápida e eficiente. Em decorrência maior demanda estética por parte...

OBJECTIVE: The aim of this study was to assess resistance sliding stainless steel passive self-ligating brackets with 0° and 2.5° angulations compare them active at zero angulation. hypothesis be tested that produce lower frictional forces than brackets. METHODS: Twenty five 0.022 x 0.028-in slot maxillary canine were divided into 5 groups brackets: Damon SL II (Ormco, CA, USA) bracket Gemini (3M/Unitek, conventional angulation 0 a group Speed 2 (American Orthodontics, WI, clip system...

The objective of this article is to investigate the mechanical properties and surface morphology fiber-reinforced composite (FRC) wires.FRC (Optis) wire a NiTi 0.016 in diameter were evaluated with 3-point bending test on universal testing machine at temperatures 23±1oC 37±1oC.The sample was cut size 30mm divided into 5 groups, each consisting 6 specimens.Group 1, 2 tested 3.1-mm deflection, groups 3 4 1.5mm deflection.The hysteresis curves compared FRC wires observed by SEM.Clear breakages...

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