Evaluation of Microgap Size and Microbial Leakage in the Connection Area of 4 Abutments With Straumann (ITI) Implant

2012 ◽  
Vol 38 (6) ◽  
pp. 677-685 ◽  
Author(s):  
Mansoor Rismanchian ◽  
Mahnaz Hatami ◽  
Hamid Badrian ◽  
Navid Khalighinejad ◽  
Hossein Goroohi
Keyword(s):  
Experimental Study ◽  
Electron Microscope ◽  
Statistical Test ◽  
Bacterial Suspension ◽  
Significant Difference ◽  
Different Types ◽  
The Mean ◽  
Spss Software ◽  
Scanning Electron ◽  
Abutment Screw

A microgap between implant and abutment can lead to mechanical and biological problems such as abutment screw fracture and peri-implantitis. The aim of this study was to evaluate microgap size and microbial leakage in the connection area of 4 different abutments to ITI implants. In this experimental study, 36 abutments in 4 groups (including Cast On, Castable, Solid, and Synocta abutments) connected to Straumann fixtures (with their inner part inoculated with bacterial suspension) and microbial leakage were assessed at different times. The size of the microgap in 4 randomized locations was then measured by scanning electron microscope. The data were analyzed by SPSS software and by 1-way variance statistical test, Kruskal-Wallis, and their supplementary tests (Mann-Whitney HSD and Tukey's; α = .05) at the next step. The effect of using different types of abutments was significant on the mean microgap size (P < .001) and on the mean number of leaked colonies (CFU/mL) through the connection area of the implant and abutment within the first 5 hours of the experiment (P = .012); however, it did not significantly influence microleakage at 24 hours, 48 hours, and 14 days (P = .145). Using Synocta abutments compared with Solid abutments will not provide us with more accommodation, and vice versa. Using Solid and Synocta abutments can significantly decrease the microgap size; however, Cast On abutments do not show a significant difference in terms of microgap compared with Castable abutments. Microleakage in the connection area is comparable for these 4 abutments.

scholarly journals Central and Peripheral Obesity on Severity Knee Osteoarthritis

2021 ◽  
Vol 1 (3) ◽  
pp. 64
Author(s):  
Refangga Lova Nusantara Efendi ◽  
Zulfachmi Wahab ◽  
M. Riza Setiawan
Keyword(s):  
Knee Osteoarthritis ◽  
Sampling Method ◽  
Simple Random Sampling ◽  
Statistical Test ◽  
Coefficient Of Determination ◽  
Mean Deviation ◽  
Cross Sectional ◽  
Linear Pattern ◽  
Different Types ◽  
The Mean

Background: Obesity can affect severity of knee osteoarthritis sufferers. Several studies have examined relationship between obesity and osteoarthritis, but no one has examined the different types of obesity on osteoarthritis, therefore, researchers wanted to know differences of central and peripheral obesity on severity osteoarthritis.Methods: A retrospective studi, with cross-sectional, simple random sampling method, conducted between 1 August 2014 and 30 September 2014 in Semarang City. Samples people > 50 years old. Data were analyzed by rank Spearman and Anova correlation.Results: In this study, 45.7% (n = 32) reported severe osteoarthritis. The results of the statistical test obtained p1 = 0,000 (reject Ho). The correlation coefficient (r) is 0.857 (strong), and the linear pattern is positive. The coefficient of determination (r2) is obtained (0.857) 2 = 0.73 = 73%. And 37.1% (N = 26) reported being obese. p2 = 0.043 (reject Ho). The mean deviation (MD) was 0.048 (not significant) between central obesity and peripheral obesity.Conclusion: Obesity affects severity of knee osteoarthritis. The greater body mass index, greater severity of knee osteoarthritis. 73% of severity of knee osteoarthritis is influenced by obesity, but there is no significant effect between central and peripheral obesity on the occurrence of knee osteoarthritis.

scholarly journals Why Pressure Scales Cause So Much Confusion

1993 ◽  
Vol 1 (8) ◽  
pp. 5-6
Author(s):  
Anthony D. Buonaquisti
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Ambient Pressure ◽  
High Vacuum ◽  
Ultra High Vacuum ◽  
Vacuum System ◽  
Scanning Auger Microprobe ◽  
The Mean ◽  
Scanning Electron

Pressure scales can be extremely confusing to new operators. This is not surprising. To my mind, there are three primary areas of confusion.Firstly, the pressure of gas inside an instrument changes over many orders of magnitude during pumpdown. The change is about 9 orders of magnitude for a traditional Scanning Electron Microscope and about 13 orders of magnitude for an ultra-high vacuum instrument such as a Scanning Auger Microprobe.To give an idea about the scale of change involved in vacuum, consider that the change in going from ambient pressure to that inside a typical ultra high vacuum system is like comparing one meter with the mean radius of the planet Pluto's orbit. The fact is that we don't often get to play with things on that scale. As a consequence, many of us have to keep reminding ourselves that 1 X 10-3 is one thousand times the value of 1 X 10-6 - not twice the value.

Research on the Ultra-Fine Titanium Dioxide Suspension Stability and Fractal

2011 ◽  
Vol 361-363 ◽  
pp. 288-295
Author(s):  
De Wei Chen ◽  
Xiao Ling Ge ◽  
Quen Tin Shi ◽  
Jiu Wang Tian
Keyword(s):  
Titanium Dioxide ◽  
Fractal Dimension ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Surface Sediments ◽  
Suspension Stability ◽  
Matlab Program ◽  
Different Types ◽  
Scanning Electron ◽  
Dioxide Suspension

Using scanning electron microscope, the microscopic pictures of the surface on sediment have been obtained from the sub-micron titanium dioxide suspensions without dispersant or adding different types of dispersants. Deposits of titanium dioxide suspension have been observed and the mechanism of the dispersant has been analyzed. Meanwhile, deposits of titanium dioxide gray distribution figure have been gained by self-compiled Matlab program, which proved that the surface sediments is fractal, and the fractal dimension has been calculated under different conditions. The rules between suspension stability and fractal dimension have been achieved.

The Reinforcement of Acicular Wollastonite on Polypropylene

2010 ◽  
Vol 92 ◽  
pp. 283-288 ◽  
Author(s):  
Ming Shan Yang
Keyword(s):  
Electron Microscope ◽  
Interfacial Adhesion ◽  
Screw Extruder ◽  
Feeding Method ◽  
Reinforcing Effect ◽  
Comprehensive Properties ◽  
Different Types ◽  
Twin Screw ◽  
Pp Composites ◽  
Scanning Electron

The wollastonite/PP composites were manufactured by twin-screw extruder and the effects of compatabilizer, feeding method and screw configuration on the properties of wollastonite/PP composites were investigated in this paper. The dispersion of fibrous wollastonite in PP matrix was determined by scanning electron microscope (SEM). The results showed that the strength, toughness and flowability of the composite were simultaneously guaranteed by using three different types of PP resins, and the interfacial adhesion was improved greatly by adding the compatabilizer of PP-g-MAH, which increases the comprehensive properties of wollastonite/PP composite. The fibrous dispersion of wollastonite in PP matrix was achieved by using of side feeding and the weak-shear screw configuration, which reaches the good reinforcing effect.

Preparation of Biodegradable Gradient Polymer by Microwave

2011 ◽  
Vol 236-238 ◽  
pp. 1949-1953 ◽  
Author(s):  
Ji Yan Liu ◽  
Xue Qing Liu
Keyword(s):  
Mechanical Properties ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Polymeric Membrane ◽  
Thickness Direction ◽  
Composition And Structure ◽  
Significant Difference ◽  
Gradient Variation ◽  
Percentage Ratio ◽  
Scanning Electron

A biodegradable gradient polymeric membrane based on chitosan (CS) and polyvinyl alcohol (PVA) has been prepared by microwave technique. The composition and morphology variation along the thickness direction in membrane were measured by elemental analysis and scanning electron microscope (SEM). The tensile properties of CS/PVA gradient membrane were tested. Results showed that the content of either polymer shows a gradient variation along the thickness direction. SEM photographs exhibit that morphology also evolves gradually with the varying percentage ratio of two polymers. As a result of such variations in composition and structure, the mechanical properties on both sides exhibit a significant difference. Compared with conventional isotropic membrane, gradient membrane has improved mechanical properties.

Influence of prophylaxis on the microleakage of sealants: in vitro study

2002 ◽  
Vol 26 (4) ◽  
pp. 371-375 ◽  
Author(s):  
Ana Beatriz Alonso Chevitarese ◽  
Orlando Chevitarese ◽  
Ivete Pomarico Ribeiro de Souza ◽  
Roberto Braga de Carvalho Vianna
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
In Vitro Study ◽  
Optical Microscope ◽  
Vitro Study ◽  
Significant Difference ◽  
Group A ◽  
Group B ◽  
Scanning Electron

The aim of this study was to evaluate the influence of prophylaxis on the sealants microleakage in 30 premolars divided into: Group A, Group B and Group C. The teeth were analyzed using the optical microscope (OM) and at scanning electron microscope (SEM). There was a statitical significant difference among the groups regarding the presence of microleakage, but not with the presence of tags.

EXPERIMENTAL STUDY OF THE HISTOLOGIC FINDINGS OF THE NEOENDOTHELIALIZATION ACCORDING TO LENGTH OF POLYTETRAFLUOROETHYLENE

Hand Surgery ◽  
1998 ◽  
Vol 03 (02) ◽  
pp. 263-270
Author(s):  
Kwang Suk Lee ◽  
Ki Hoon Kang ◽  
Young Sik Kim
Keyword(s):  
Experimental Study ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Light Microscope ◽  
Carotid Arteries ◽  
Internal Diameter ◽  
Operating Microscope ◽  
Fibril Length ◽  
The Right ◽  
Scanning Electron

The purpose of this study was to investigate the patency rates and the histologic findings of neoendothelialization according to the length of implanted polytetrafluoroethylene (PTFE) with an internal diameter of 3 mm. Under the operating microscope, grafts of 8 and 24 mm in length were implanted in the right carotid arteries of rabbits. All implanted grafts were 25 μm in fibril length and 0.39 mm in wall thickness. All the grafts were harvested at different intervals and observed for the patency rates and histologic findings with light microscope and scanning electron microscope. There was no difference in patency rates according to the length of implanted PTFE. Histologically the formation of neointima and subintim was delayed and incomplete in longer implanted PTFE.

scholarly journals Mechanical comparative analysis of three different types of sutures in different dimensions tendons - experimental study

2002 ◽  
Vol 10 (3) ◽  
pp. 42-51
Author(s):  
Raimundo Nonato R. Medeiros ◽  
José Wilson Rodriguez ◽  
Roberto Basile Jr. ◽  
Clelgen Luis Bonetti ◽  
Carlos Alberto dos Santos ◽  
...  
Keyword(s):  
Experimental Study ◽  
Comparative Analysis ◽  
Iliac Bone Graft ◽  
Congenital Kyphosis ◽  
Different Types ◽  
Spinal Arthrodesis ◽  
Different Dimensions ◽  
The Mean ◽  
Mean Time

The authors present sixteen patients with congenital kyphosis treated by posterior spinal arthrodesis. A homologous or autogenous iliac bone graft was used. The patients walked with Risser-Cotrel body cast in the 6 months of postoperatory period. The mean time of follow-up was 58,25 months and the mean age of the patients at time of surgery was 9,3 years. The mean angular value of the congenital kyphosis before surgery was 50,44º Cobb and after ther surgery it was 46,94º Cobb. One of the patients who had curve of 69º Cobb, presented pseudoarthrosis. The final results were good in 10, regular in 4 and bad in 2 patients. The need of the diagnostic and precocious treatment is recommended by authors.

scholarly journals Effect of dry cord care versus chlorhexidine cord care on cord separation time in healthy newborns: A comparative study

2020 ◽  
Vol 9 (2) ◽  
pp. 70-73
Author(s):  
Rydam Basnet ◽  
Sunil Raja Manandhar ◽  
Anwesh Bhatta ◽  
Rakesh Kumar Shah ◽  
Ritika Basnet
Keyword(s):  
Direct Access ◽  
Care Group ◽  
Cord Care ◽  
Mortality And Morbidity ◽  
Medical College ◽  
Separation Time ◽  
Significant Difference ◽  
Different Types ◽  
The Mean ◽  
Baseline Characteristics

Background:  Umbilical cord infection (omphalitis) is a major cause of neonatal mortality and morbidity in a developing country like Nepal. Detached umbilical stump is an important colonizing site for different types of bacteria and it also provides direct access to bloodstream. Hence, inadequate cord care may lead to omphalitis as well as neonatal sepsis. Objectives: This study aims to compare two different cord care regimens (dry cord care versus chlorhexidine cord care) on their cord separation time and the incidence of omphalitis. Methodology: This is a comparative observational study conducted at the Neonatal unit of Kathmandu Medical College over a three months period (August 2019 to October 2019).  All newborn babies born between 37 to 42 weeks of gestation were enrolled. Randomization for dry cord care and chlorhexidine cord care group was done via computer generated numbers. Statistical package for social sciences 19 version was used for statistical analysis.   Results: Among 514 term babies, 256 babies were included in the dry cord care group while 258 babies were enrolled in the chlorhexidine cord care group. The two groups had similar baseline characteristics. The mean cord separation time in the dry cord care group was 7.70±1.2 days (range 3-15 days), whereas in the chlorhexidine group, it was 7.77±1.4 days (range 4-18 days).  Conclusion: There was no significant difference between the cord separation times in dry and chlorhexidine cord care regimens. Both dry cord care and chlorhexidine cord care regimens were found to be safe and effective.

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