The Effects of Differing Acid Concentrations, Techniques and Etch Time on the Etch Pattern of Enamel of Erupted and Unerupted Human Teeth Examined using the Scanning Electron Microscope

1988 ◽  
Vol 15 (1) ◽  
pp. 45-49 ◽  
Author(s):  
R. G. Oliver
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Acid Concentration ◽  
Human Teeth ◽  
Etch Pattern ◽  
Roughened Surface ◽  
Orthodontic Bonding ◽  
Etch Time ◽  
Scanning Electron

The effects of varying acid concentration, etch time and agitation, on the etch properties of enamel from unerupted and erupted human teeth, were examined using the scanning electron microscope. Results showed that whilst there are differences in behaviour between erupted and unerupted enamel when conditions are varied, under most circumstances unerupted enamel will behave in a similar manner to erupted enamel. With low acid concentration both the duration of etch and agitation seem to be important factors in producing a roughened surface. It is suggested that the manufacturers' recommendations be more precise for a new low acid concentration orthodontic bonding package.

The Effects of Differing Etch Times on the Etch Pattern on Enamel of Unerupted and Erupted Human Teeth Examined using the Scanning Electron Microscope

1987 ◽  
Vol 14 (2) ◽  
pp. 105-107 ◽  
Author(s):  
R. G. Oliver
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Phosphoric Acid ◽  
Acid Etching ◽  
Human Teeth ◽  
Etch Pattern ◽  
Scanning Electron

The etch pattern produced on enamel from unerupted and erupted human teeth with varying periods of acid etching using 37 per cent phosphoric acid was examined using a scanning electron microscope. For erupted enamel etch scores were fairly consistent above 10 seconds etching, for unerupted enamel etch scores matched those for erupted enamel for etch times above 30 seconds. The etch type was more consistent on unerupted enamel.

scholarly journals Attempt to assess the infiltration of enamel made with experimental preparation using a scanning electron microscope

Open Medicine ◽  
2015 ◽  
Vol 10 (1) ◽  
Author(s):  
Małgorzata Skucha-Nowak
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Test Group ◽  
Control Group ◽  
Depth Of Penetration ◽  
Human Teeth ◽  
X Ray ◽  
Demineralized Enamel ◽  
Experimental Preparation ◽  
Scanning Electron

AbstractIntroduction: The resin infiltration technique, a minimally invasive method, involves the saturation, strengthening, and stabilization of demineralized enamel by a mixture of polymer resins without the need to use rotary tools or the risk of losing healthy tooth structures.Aim of the study:1. To design and synthesize an experimental infiltrant with potential bacteriostatic properties.2. To compare the depth of infiltration of the designed experimental preparation with the infiltrant available in the market using a scanning electron microscope.Material and Methods: Composition of the experimental infiltrant was established after analysis of 1H NMR spectra of the commercially available compounds that can penetrate pores of demineralized enamel. As the infiltrant should have bacteriostatic features by definition, an addition of 1% of monomer containing metronidazole was made. Thirty extracted human teeth were soaked in an acidic solution, which was to provide appropriate conditions for demineralization of enamel. Afterward, each tooth was divided along the coronal-root axis into two zones. One zone had experimental preparation applied to it (the test group), while the other had commercially available Icon (the control group). The teeth were dissected along the long axis and described above underwent initial observation with use of a Hitachi S-4200 scanning electron microscope.Results: It was found that all samples contained only oxygen and carbon, regardless of the concentration of additions introduced into them. The occurrence of carbon is partially because it is a component of the preparation in question and partially because of sputtering of the sample with it. Hydrogen is also a component of the preparation, as a result of its phase composition; however, it cannot be detected by the EDS method.Conclusions:1. SEM, in combination with X-ray microanalysis, does not allow one to explicitly assess the depth of penetration of infiltration preparations into enamel.2. In order to assess the depth of penetration of infiltration preparations with use of X-ray microanalysis, it is recommended to introduce a contrast agent that is approved for use in dental materials, such as ytterbium III fluoride.

Etching Techniques and the Surface Morphology of the Gunflint Chert

1975 ◽  
Vol 33 ◽  
pp. 226-227
Author(s):  
A. H. Johnson
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Surface Morphology ◽  
Hydrofluoric Acid ◽  
Three Dimensional ◽  
Optimum Concentration ◽  
Energy Dispersive Analysis ◽  
The Difference ◽  
Etch Time ◽  
Scanning Electron

Samples of the Gunflint Chert (2.0 billion years old), collected near Kakabeca Falls, Ontario by Dr. L. P. Knauth, have yielded several distinct and recurring morphologies when in hydrofluoric acid of varying concentrations for varying lengths of time, and viewed with a scanning electron microscope.The chert is entirely siliceous, with the exception of minor calcareous lenses identified by energy dispersive analysis. Previous studies of the Gunflint Chert have been made using TEM however SEM offers a three dimensional view which greatly aids interpretation.The samples were prepared by fracturing followed by etching in HF for 30 seconds to 48 hours with concentrations varying from .5% to 30%. It appears that the optimum concentration and etch time varies according to the particular morphology one wishes to develop. This is due to the difference in response to HF by the different textures in the rocks.

scholarly journals Analysis of Electronic Apex Locators in Human Teeth Diagnosed With Apical Periodontitis

2019 ◽  
Vol 30 (6) ◽  
pp. 550-554
Author(s):  
Norberto J Broon ◽  
Claudia Azucena Palafox-Sánchez ◽  
Carlos Estrela ◽  
Diana Celeste Salazar Camarena ◽  
Mario Uribe ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Root Canal ◽  
Apical Periodontitis ◽  
The Other ◽  
Root Canal Treatment ◽  
Human Teeth ◽  
Working Length ◽  
Significant Difference ◽  
Scanning Electron

Abstract Electronic apex locators (EAL) have been used to establish the working length (WL) in root canal treatment. In teeth diagnosed with apical periodontitis, resorption of tooth apical structures can lead to difficulties to obtain an appropriate WL. The aim was to compare the capacity of three EAL’s (Root ZX II, Raypex 6 and Endo-Eze Quill) to locate the tip of the K-file between 0 to -0.5 mm from the apical foramen (AF) on teeth diagnosed with asymptomatic apical periodontitis (AAP). Electronic working length was performed on 60 roots with AAP. A K-file #15 was inserted in the root canal until the apical foramen (AF) was located, and followed was re-adjusted to -0.5 mm through observation in EAL display. The K-file was fixed to the tooth with composite and teeth were extracted. The 4 apical millimeters were worn out until the K-file could be seen and were prepared and measured its distance to AF in a scanning electron microscope. Appropriate WL was when the tip of the K-file was located between 0 to -0.5 mm from AF. Results: Root ZX II showed significant difference (p<0.01) with the other two EALs. Root ZX II presented the better performance than Raypex 6 or Endo-Eze Quill in teeth with AAP.

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