Effect of Different Cleaning and Sterilization Methods on the Surface Morphology of Mini-implants

2017 ◽  
Vol 68 (9) ◽  
pp. 1974-1977
Author(s):  
Silvia Izabella Pop ◽  
Dana Cristina Bratu ◽  
Violeta Valentina Merie ◽  
Mariana Pacurar ◽  
Catalin Petru Simon ◽  
...  
Keyword(s):  
Surface Morphology ◽  
Surface Topography ◽  
Distilled Water ◽  
Mini Implants ◽  
Cleaning Methods ◽  
Sem Analyses

The objective of this study was to analyse morphological and surface topography variations of two types of mini-implants after using different chemical and physical cleaning methods and autoclaved sterilization. One hundred mini-implants from two different manufacturers were used in this study. The mini-implants from each manufacturer were divided in five groups, each consisting of ten samples: G0 new, unused, G1 ultrasonically cleaned, G2 chemically cleaned, G3 sandblasted, G4 cleaned with distilled water. SEM analyses of the mini-implants were performed. Only procedures used in samples from group G2 and G3 removed the tissue remains from the mini-implants surface.

scholarly journals Effects of Current on Arc Fabrication of Cu Nanoparticles

2010 ◽  
Vol 2010 ◽  
pp. 1-5 ◽  
Author(s):  
M. Z. Kassaee ◽  
F. Buazar ◽  
E. Motamedi
Keyword(s):  
Thermal Stability ◽  
Distilled Water ◽  
Face Centered Cubic ◽  
Cu Nanoparticles ◽  
Dta Analysis ◽  
Face Centered ◽  
Average Size ◽  
20 Nm ◽  
Thermal Stability Of ◽  
Sem Analyses

Arc-fabricated copper nanoparticles (Cu Nps) size, morphology and the crystalline structure, as well as the yields of Nps appear sensitive to the applied currents (50–160 A) in distilled water. The results indicate that the sizes of Cu Nps are directly proportional to the currents employed. At 50 A, TEM, XRD, and SEM analyses show fabrication of relatively purest, the most dispersed, face-centered cubic (fcc) brown Cu Nps with rather smallest average size of 20 nm. At the same current, the TGA-DTA analysis reveals neither weight loss nor gain, indicating thermal stability of the fabricated Cu Nps.

Investigation of Abrasive Wear in the Dry Belt Grinding of Titanium Alloy

2011 ◽  
Vol 697-698 ◽  
pp. 121-124 ◽  
Author(s):  
Wen Guo Huo ◽  
Jiu Hua Xu ◽  
Yu Can Fu ◽  
Hou Jun Qi
Keyword(s):  
Titanium Alloy ◽  
Surface Morphology ◽  
Abrasive Wear ◽  
Surface Topography ◽  
Grinding Force ◽  
Milling Machine ◽  
Excellent Performance ◽  
Belt Grinding ◽  
Dry Grinding ◽  
Abrasive Surface

This paper was dedicated to elucidate an investigation of abrasive wear and surface topography of Titanium alloy TA15 on dry grinding with zirconia alumina belt. In the investigation, experiments were performed on milling machine XS5040 equipped with assembled belt grinding device. The wear abrasive, surface morphology of machined belt in different phase were analyzed using 3D viewer microscope. The results show that the wear of belt abrasive is mainly steady attritions wear since zirconia alumina belt was stable on dry grinding. At higher grinding force, the abrasive was found to undergo dislodging prior to being gradually worn. So zirconia alumina belt has excellent performance in the dry grinding titanium alloy.

Research on the Surface Roughness Parameters of Micro-EDM

2013 ◽  
Vol 572 ◽  
pp. 281-286 ◽  
Author(s):  
Zhi Jie Chen ◽  
Ji Hong Shen ◽  
Yun Tao Dai
Keyword(s):  
Surface Roughness ◽  
Surface Morphology ◽  
Surface Topography ◽  
Evaluation Method ◽  
Micro Edm ◽  
Roughness Parameters ◽  
Surface Roughness Parameters ◽  
Evaluation Problem ◽  
Lubrication Characteristics ◽  
Morphology Characteristics

The surface topography errors of micro-EDM are mainly composed of surface roughness, surface waveness and so on. Research shows that the surface morphology provides a lot of useful information, which has serious influence on the friction and lubrication characteristics of the surface. However, for the micro-EDM surface topography evaluation problem, researchers have been using surface roughness parameters and evaluation method of mechanical process, which restrict the micro-EDM technology further development. On this account, the surface roughness parameters of micro-EDM have been deeply studied in this paper according to its technology characteristics and the surface morphology characteristics, therefore, the main researches and creative points are obtained, which the influence that the surface roughness of micro-EDM parts impact on their using performance is analyzed, and based on the surface morphology characteristics, some roughness evaluation parameters are given respectively according to peaks and valley, moreover, their numerical calculation are also gained.

Manual and Automated Cleaning Are Equally Effective for the Removal of Organic Contaminants From Laparoscopic Instruments

2017 ◽  
Vol 39 (1) ◽  
pp. 58-63 ◽  
Author(s):  
Tamara Carolina de Camargo ◽  
Alda Graciele Claudio dos Santos Almeida ◽  
Camila Quartim de Moraes Bruna ◽  
Caroline Lopes Ciofi-Silva ◽  
Flávia Morais Gomes Pinto ◽  
...  
Keyword(s):  
Laboratory Study ◽  
Organic Contaminants ◽  
Tap Water ◽  
Distilled Water ◽  
Organic Residues ◽  
Ultrasonic Cleaning ◽  
Laparoscopic Instruments ◽  
Experimental Laboratory ◽  
Cleaning Methods ◽  
Automated Methods

OBJECTIVETo compare the effectiveness of manual and automated methods for cleaning laparoscopic instruments.DESIGNExperimental laboratory study.METHODSWe evaluated 4 methods of cleaning laparoscopic instruments: (1) manual-only cleaning and rinsing with potable tap water; (2) manual cleaning and rinsing with potable tap water, followed by ultrasonic cleaning without rinsing; (3) manual cleaning and rinsing with potable tap water followed by ultrasonic cleaning and rinsing with potable tap water; and (4) manual cleaning and rinsing with potable tap water, followed by ultrasonic cleaning and rinsing: first with potable tap water and then with sterile distilled water. Organic residues of protein, hemoglobin, and carbohydrates were evaluated using spectrophotometry.RESULTSThe various cleaning methods tested did not result in statistically significant differences (P>.05) in the levels of investigated organic residues.CONCLUSIONSAll cleaning and rinsing methods tested were found to be effective in reducing the levels of organic residues on laparoscopic instruments. Thus, there is no advantage gained by supplementing manual-only cleaning with automated ultrasonic cleaning, nor was there a difference between rinsing with potable tap versus sterile distilled water.Infect Control Hosp Epidemiol 2018;39:58–63

scholarly journals Characterization of surface topography and chemical composition of mini-implants

2015 ◽  
Vol 14 (3) ◽  
pp. 251-255 ◽  
Author(s):  
Luegya Amorim Henriques Knop ◽  
Ana Prates Soares ◽  
Ricardo Lima Shintcovsk ◽  
Lidia Parsekian Martins ◽  
Luiz Gonzaga Gandini Jr.
Keyword(s):  
Chemical Composition ◽  
Surface Topography ◽  
Mini Implants

scholarly journals Usage of Fiber-Reinforced Resin Instruments in Interproximal Surfaces

2008 ◽  
Vol 02 (02) ◽  
pp. 096-101
Author(s):  
Deniz C. Can-Karabulut ◽  
Perihan Ozyurt ◽  
Ayhan Gurbuz ◽  
Abdulkadir Gullu
Keyword(s):  
Surface Roughness ◽  
Surface Topography ◽  
Soft Tissues ◽  
Composite Resin ◽  
The Other ◽  
Fiber Reinforced ◽  
Surface Textures ◽  
Other Hand ◽  
Representative Samples ◽  
Sem Analyses

ABSTRACTObjectives: The aim of this study was to investigate the effects of fiber-reinforced resin burs on the surface roughness of a nanofilled composite.Methods: Average surface roughness values (Ra, �m) were measured using a surface profilometer and surface textures after finishing procedures were evaluated using a scanning electron microscope (SEM). Thirty cylindrical specimens were prepared using sectional teflon molds. A nanofilled composite was chosen. After the preparation specimens were divided into three subgroups randomly. After profilometric measurements, representative samples of the mentioned finishing procedures were selected and SEM analyses were carried out.Results: Mylar strip group was statistically different from the other two groups (P<.05). The smoothest surfaces occurred when composite resin samples were light cured against the strips. On the other hand there was no statistical difference between fiber-reinforced resin burs and Sof-Lex discs (P>.05). For fiber-reinforced resin burs scratches and pitting which may be due to plucking of the filler particles during finishing were observed on the surface topography of the composite resin material. On the other hand, for the Sof-Lex discs although scratches were noticed on the surface topography, no pitting was observed.Conclusions: Fiber-reinforced resin burs can be preferred for the grinding of composite surplus in interproximal surfaces, where the use of Sof-Lex discs can be harmful to soft tissues. (Eur J Dent 2008;2:96-101)

scholarly journals A Geometric Prediction Model of Surface Morphology in Micro-EDM Considering Stochastic Characteristics of Discharge Crater Size

2021 ◽  
Author(s):  
Shaojie Hou ◽  
J C Bai
Keyword(s):  
Surface Morphology ◽  
Surface Topography ◽  
Real Surface ◽  
Discharge Process ◽  
Machining Parameters ◽  
Micro Edm ◽  
Distribution Characteristics ◽  
Surface Features ◽  
Crater Size ◽  
Stochastic Characteristics

Abstract The surface topography of micro-EDM is closely related to its application range, so it is important to accurately predict the surface morphology. Most of the existing models do not consider the stochastic characteristics and uncertainty of the discharge process, which could produce great differences with the experimental results. Aiming at these problems, the stochastic characteristic of the discharge crater size is studied, and a simulation model is established to predict the surface topography of EDM considering the stochastic characteristics of crater size. Firstly, the stochastic characteristics of the crater size were investigated through the finite-successive pulses discharge method and characterized from the perspective of probability theory. The stochastic characteristics was explained by analyzing discharge waveforms. Secondly, the response surface method (RSM) was used to map the corresponding relationship between the input machining parameters and the distribution characteristics of crater size. It was observed that the RSM model can accurately predict the distribution characteristics of crater size in the range of parameters selected in this study. Finally, models based on stochastic distribution of crater size (MSDS) and fixed crater size (MFS) were established respectively. By analyzing the characteristics of the simulated surfaces and the machined surface, it was found that the surface features of MSDS are closer to the real surface features. Compared with MFS, the roughness prediction error and the average of overall error of MSDS are reduced by 1.01% and 18.97% respectively. The results of this work are helpful to understand the randomness and realize the controllability of EDM.

scholarly journals Влияние кристаллографической ориентации пленок GaSb на их структурные свойства при гетероэпитаксии на вицинальных подложках Si(001) методом молекулярно-лучевой эпитаксии

2020 ◽  
Vol 54 (12) ◽  
pp. 1289
Author(s):  
М.О. Петрушков ◽  
Д.С. Абрамкин ◽  
Е.А. Емельянов ◽  
М.А. Путято ◽  
А.В. Васев ◽  
...  
Keyword(s):  
Molecular Beam Epitaxy ◽  
Surface Morphology ◽  
Surface Topography ◽  
Point Defects ◽  
Crystallographic Orientation ◽  
Molecular Beam ◽  
Structural Perfection ◽  
Transition Layers ◽  
Antiphase Domains ◽  
Si Films

GaSb films were grown by molecular beam epitaxy using AlSb/As/Si transition layers on vicinal Si (001) substrates deflected 6 to the (111) plane. The influence of the GaSb films crystallographic orientation on their structural properties and surface morphology is investigated. It was found that GaSb(001 ̅)/Si films are characterized by better structural perfection, lower concentration of point defects and more planar and isotropic surface topography, compared with GaSb(001) films. Possible reason for the observed differences between GaSb films with different orientations is increased density of antiphase domains in GaSb(001) films. The morphological features of the grown films are caused by the terraces edges basically and by the anisotropy of the incorporation of Ga adatoms into the terraces edges, to a lesser extent.

scholarly journals Apically extruded debris in filling removal of curved canals using 3 NiTi systems and hand files

2018 ◽  
Vol 29 (1) ◽  
pp. 54-59 ◽  
Author(s):  
Débora Delai ◽  
Daiana Boijink ◽  
Carolina Bender Hoppe ◽  
abiana Soares Grecca ◽  
Patrícia Maria Poli Kopper
Keyword(s):  
Working Time ◽  
The Other ◽  
Distilled Water ◽  
Initial Weight ◽  
Time Data ◽  
Deformation And Fracture ◽  
Significant Difference ◽  
Niti Instruments ◽  
Sem Analyses

Abstract The aim of this study was to assess the amount of apically extruded debris during filling removal with WaveOne Gold (WOG), ProTaper Universal Retreatment (PTR), D-RaCe Retreatment (DRR) or hand files (HF), to compare the working time during filling removal, and to describe failures of NiTi instruments. Forty mesiobuccal roots of maxillary first molars were prepared with WOG Primary, obturated and divided into 4 groups (n=10), according to the instruments used: WOG, PTR, DRR or HF. Distilled water was used as irrigant and the extruded debris were collected in Eppendorf tubes and dried. The amount of extruded debris was determined by subtracting the final from the initial weight. The time of filling removal for each canal was recorded and the instruments used were analyzed pre and post-operatively by SEM. Kruskal-Wallis and Dunn’s test analyzed extruded debris data and ANOVA, followed by Tukey’s test, compared the working time data (a=0.05). Instrument deformation and fracture were described. WOG produced significantly less debris compared with HF and DRR (p<0.05), and similar to PTR (p>0.05). HF, PTR and DRR showed no significant difference (p>0.05). Working time in HF group was significantly higher than others (p<0.05). SEM analyses showed, from the 18 instruments evaluated, 3 fractures and 10 deformations. All instruments tested caused debris extrusion. WOG was associated with less extrusion than DRR and HF. Filling removal with HF was slower than with the other instruments. All NiTi systems presented fracture and deformation.

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