In - Vitro Evaluation of Load - Deflection Characteristics and Force Levels of Nickel Titanium Orthodontic Archwires

2015 ◽  
Vol 27 (3) ◽  
pp. 159-164
Author(s):  
Riyadh Abdu Al-Hamza Ruwiaee ◽  
Akram Faisal Al-Huwaizi
Keyword(s):  
Nickel Titanium ◽  
In Vitro Evaluation ◽  
Orthodontic Archwires

scholarly journals In vitro biocompatibility of nickel-titanium esthetic orthodontic archwires

2016 ◽  
Vol 86 (5) ◽  
pp. 789-795 ◽  
Author(s):  
Roberto Rongo ◽  
Rosa Valletta ◽  
Rosaria Bucci ◽  
Virginia Rivieccio ◽  
Angela Galeotti ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Steel Wire ◽  
Nickel Titanium ◽  
Experimental Conditions ◽  
In Vitro Biocompatibility ◽  
Diphenyltetrazolium Bromide ◽  
Titanium Wire ◽  
Orthodontic Archwires ◽  
Niti Wires

ABSTRACT Objective:  To investigate the cytotoxicity of nickel-titanium (NiTi) esthetic orthodontic archwires with different surface coatings. Materials and Methods:  Three fully coated, tooth-colored NiTi wires (BioCosmetic, Titanol Cosmetic, EverWhite), two ion-implanted wires (TMA Purple, Sentalloy High Aesthetic), five uncoated NiTi wires (BioStarter, BioTorque, Titanol Superelastic, Memory Wire Superelastic, and Sentalloy), one β-titanium wire (TMA), and one stainless steel wire (Stainless Steel) were considered for this study. The wire samples were placed at 37°C in airtight test tubes containing Dulbecco’s Modified Eagle’s Medium (0.1 mg/mL) for 1, 7, 14, and 30 days. The cell viability of human gingival fibroblasts (HGFs) cultured with this medium was assessed by the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay. Data were analyzed by a two-way analysis of variance (α  =  .05). Results:  The highest cytotoxic effect was reached on day 30 for all samples. The archwires exhibited a cytotoxicity on HGFs ranging from “none” to “slight,” with the exception of the BioTorque, which resulted in moderate cytotoxicity on day 30. Significant differences were found between esthetic archwires and their uncoated pairs only for BioCosmetic (P  =  .001) and EverWhite (P < .001). Conclusions:  Under the experimental conditions, all of the NiTi esthetic archwires resulted in slight cytotoxicity, as did the respective uncoated wires. For this reason their clinical use may be considered to have similar risks to the uncoated archwires.

scholarly journals In Vitro Corrosion Behavior of Lingual Orthodontic Archwires

2011 ◽  
Vol 2011 ◽  
pp. 1-9 ◽  
Author(s):  
Carlos Suárez ◽  
Teresa Vilar ◽  
Pablo Sevilla ◽  
Javier Gil
Keyword(s):  
Differential Scanning Calorimetry ◽  
Stainless Steel ◽  
Rhombohedral Phase ◽  
Nickel Titanium ◽  
Scanning Calorimetry ◽  
Lingual Orthodontics ◽  
Phase Transition Temperatures ◽  
Different Types ◽  
Orthodontic Archwires

Objectives. To investigate the in vitro electrochemical corrosive behavior of archwires used in lingual orthodontics and the effects on the phase transition temperatures.Materials and Methods. Six different types of archwires of stainless steel, titanium-molybdenum, nickel-titanium and nickel-titanium-copper were used. Corrosion tests were performed following ISO-standard 10993-15:2000. Differential scanning calorimetry and scanning electron microscopy were used.Results. The stainless steel archwires showed anEpitaround −600 mV, and those of titanium alloys showedEpitvalues around 1000 mV. Differential scanning calorimetry detected a rhombohedral phase in nickel-titanium archwires, while it was not detected in nickel-titanium-copper wires. A difference of 2°C to 3.5°C from the manufacturer's claim was found in the as-received and polarized samples, respectively.Conclusions. The 0.016 stainless steel archwires were found to be the less resistant to corrosion. A rhombohedral phase was detected on the nickel-titanium archwires. No major differences were observed among groups concerning phase transformation temperatures.

scholarly journals Torsional Resistance of Two New Heat Treated Nickel Titanium Rotary Instruments: An in Vitro Evaluation

2020 ◽  
Vol 20 ◽  
Author(s):  
Gianluca Gambarini ◽  
Gabriele Miccoli ◽  
Dario Di Nardo ◽  
Andrea Del Giudice ◽  
Alessandro Mazzoni ◽  
...  
Keyword(s):  
Nickel Titanium ◽  
In Vitro Evaluation ◽  
Torsional Resistance ◽  
Heat Treated ◽  
Rotary Instruments

scholarly journals Effect of fluoride on mechanical properties of NiTi and CuNiTi orthodontic archwires: an in vitro study

2021 ◽  
Vol 26 (2) ◽  
Author(s):  
Pratap MANE ◽  
Chanamallappa R. GANIGER ◽  
Renuka PAWAR ◽  
Sandesh PHAPHE ◽  
Yusuf Ahammed RONAD ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Yield Strength ◽  
Artificial Saliva ◽  
Testing Machine ◽  
In Vitro Study ◽  
Nickel Titanium ◽  
Orthodontic Wire ◽  
Point Bend ◽  
Orthodontic Archwires

ABSTRACT Introduction: After debonding, white spot may appear on the area below the bracket, which is the early clinical sign of carious lesion. There is increased caries risk underneath and adjacent to orthodontic bands and brackets, which call for maximum use of caries preventive procedures using various fluoride application methods. Objective: The aim of the study was to evaluate alterations in the mechanical properties (modulus of elasticity and yield strength) in loading and unloading phases for different orthodontic archwires (nickel-titanium [NiTi] and copper-nickel-titanium [CuNiTi]) when exposed routinely to fluoride prophylactic agents for a predetermined period of time. Methods: Preformed rectangular NiTi and CuNiTi wires were immersed in fluoride solution and artificial saliva (control) for 90 minutes at 37ºC. After immersion, specimens were tested using a 3-point bend test on a universal testing machine. Results: There is a significant reduction in the unloading yield strength when the NiTi and CuNiTi wires were exposed to APF gel. Conclusion: The result suggests that use of topical fluoride agents affect the mechanical properties of the wires, leading to increase in treatment duration. Fluoride prophylactic agents must be used with caution in patients undergoing orthodontic treatment. Injudicious use of these agents may cause corrosive effects on the orthodontic wire surfaces, with alteration in their mechanical properties.

In vitro evaluation of IL-18 effects in Crohn's disease

2001 ◽  
Vol 120 (5) ◽  
pp. A316-A317
Author(s):  
P MAERTEN ◽  
S COLPAERT ◽  
Z LIU ◽  
K GEBOES ◽  
J CEUPPENS ◽  
...  
Keyword(s):  
Crohn’S Disease ◽  
Crohn's Disease ◽  
In Vitro Evaluation
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