scholarly journals INVESTIGATION OF FIT OF THE INDIVIDUAL ABUTMENT TO THE VARIOUS PLATFORMS OF IMPLANTS ON SAGITTAL SECTION

2019 ◽  
Vol 15 (2) ◽  
pp. 106-109
Author(s):  
Константин Саркисян ◽  
Konstantin Sarkisyan ◽  
Мария Стрижакова ◽  
Maria Strizhakova ◽  
В. Стрижаков ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Three Dimensional ◽  
Marginal Fit ◽  
Different Types ◽  
Volumetric Images ◽  
Cad Cam ◽  
Inflammatory Processes ◽  
Sagittal Slice ◽  
Grinding Machine ◽  
The Individual

Introduction. Modern implant systems have different types of connections between the implant and the abutment, in the area of which a microgap can be constructively formed, as a result of which dentists are faced with a loss of bone tissue and inflammatory processes in the area of dental implants. Objectives ― assessment of the accuracy of the marginal fit of an individual abutment to the implant platform on a sagittal slice. Methods. Two groups were formed according to the type of connection between the implant and the abutment (conical and planar). Individual abutments for all systems were made using CAD-CAM technology. Using the grinding machine Metaserv 25, sagittal sections of the abutment and implant were obtained. The study and cutting the compound was carried out on a TESCAN MIRA 3 autoemission electron microscope. Results. Using an electron microscope TESCAN MIRA 3, we obtained images of the surface of the connection of the abutment and the implant on a sagittal slice. When three-dimensional scanning of the studied samples were obtained volumetric images. Measurements of the microgap of the implant compound and abutment on the sagittal split showed that with an increase of x8000 in the first group with a conical connection, the figure varied from 0.27-3.46 microns. In the second group with a planar compound, the index varied from 6.50-9.70 microns. Conclusions. The ratio of the abutment to the implant with conical connections showed the best results in comparison with planar connections. Using CAD-CAM technology allows you to create prostheses with good marginal fit of the connection between the implant and the abutment.

scholarly journals Development and evaluation of a three-dimensional multi-level model for visualising the workflow composite score in a health IT benchmark

2016 ◽  
Vol 2 (2) ◽  
pp. 83
Author(s):  
Johannes Thye ◽  
Ursula Hübner ◽  
Matthias-Christopher Straede ◽  
Jan-David Liebe
Keyword(s):  
Three Dimensional ◽  
Clinical Information ◽  
Composite Score ◽  
Health It ◽  
Information Logistics ◽  
Different Types ◽  
Multiple Indicator ◽  
Level Model ◽  
Multi Level ◽  
The Individual

Background: Clinical information logistics is the backbone of care workflows inside and outside of hospitals. Due to the great potential of health IT to support clinical processes its contribution needs to be regularly monitored and governed. IT benchmarks are a well-known instrument to optimise the availability and use of IT by guiding the decision making process. The aim of this study was to translate IT benchmarking results that were grounded on a hierarchical workflow scoring system into an appropriate visualisation concept. Methods: To this end, a three-dimensional multi-level model was developed, which allowed the decomposition of the highly aggregated workflow composite score into score views for the individual clinical workflows concerned and for the descriptors of these workflows. Furthermore this multi-level model helped to break down the score views into single and multiple indicator views. Results: The results could be visualised per hospital in comparison to the results of organisations of similar size and ownership (peer reference groups) and in comparison to different types of innovation adopters. The multi-level model was implemented in a benchmark of 199 hospitals and evaluated by the chief information officers. The evaluation resulted in high ratings for the comprehensibility of the different types of views of the scores and indicators. Conclusions: The implementation of the multi-level model in a large benchmark of hospitals proved to be feasible and useful in terms of the overall structure and the different indicator views. There seems to be a preference for less complex and familiar views. 

scholarly journals Multivariate Assessment of Marginal Fit of Three Types of Dental Crowns Using Three Scanning Systems for CAD-CAM Technology - in vitro Pilot Study

2018 ◽  
Vol 55 (3) ◽  
pp. 376-379
Author(s):  
Smaranda Buduru ◽  
Anca Mesaros ◽  
Cristian Culcitchi ◽  
Marioara Moldovan ◽  
Doina Prodan ◽  
...  
Keyword(s):  
In Vitro Study ◽  
Marginal Fit ◽  
Dental Crowns ◽  
Intraoral Scanning ◽  
Different Types ◽  
Cad Cam ◽  
Scanning Systems ◽  
Conventional Impression ◽  
Hybrid Ceramic

The objective of this in-vitro study was to compare if there are any differences in the marginal fit of crowns fabricated by CAD/CAM technique. We used three different types of materials (two types of polymethylmetacrylate (PMMA) provided by two different manufacturers and one type of hybrid ceramic) and three different types of impressions: intraoral scanning, model scanning and conventional impression scanning. The crowns were subsequently measured with an electronic microscope at 1000X. Our results showed better results for the hybrid ceramic. The differences between the PMMA were not significant. There were no statistic differences with the ANOVA analysis between the scanning methods. Best combination in terms of marginal fit was found with hybrid ceramic and intraoral scanning.

scholarly journals Arcrekonstrukciós és orthognath műtétek tervezési lehetőségei háromdimenziós képalkotói módszerekkel

2018 ◽  
Vol 159 (39) ◽  
pp. 1584-1592
Author(s):  
Adrienn Dobai ◽  
Zsolt Markella ◽  
Tamás Vízkelety ◽  
József Barabás
Keyword(s):  
Traumatic Injury ◽  
Three Dimensional ◽  
Three Dimensions ◽  
Lateral Cephalogram ◽  
Three Dimensional Printing ◽  
Surgical Model ◽  
Reconstructive Operations ◽  
Cad Cam ◽  
The Individual ◽  
Cephalometric Measurements

Abstract: We summarize up-to-date planning technics of orthognathic and reconstructive surgery operation which appeared with three-dimensional imaging, using literature data and some clinical examples. In many cases, orthognathic and reconstructive operations mean the only treatment of facial deformity caused by tumour, traumatic injury or congenital anomaly. In this field, radiology plays an important role not only in the diagnosis but also in the planning of the treatment. With the appearance of cone-beam computed tomography (CBCT), the previously used two-dimensional cephalometric analysis on lateral cephalogram was changed for three-dimensional cephalometric measurements. The first step of the adaptation was the lateral and frontal x-ray images generated from the CBCT database and later the volume rendered surface and segmentation technics provided the moving of the facial bones in three dimensions which meant virtual surgical planning. With the development of CAD/CAM technic and the three-dimensional printing, many opportunities became available, such as preoperative bending splints and plates and printed surgical model for the tangible planning. The progress of imaging facilitated the individual, accurate, and reliable planning which significantly determines the success of the treatment. Orv Hetil. 2018; 159(39): 1584–1592.

scholarly journals Multivariate Assessment of Marginal Fit Concerning Two Types of Dental Inlays Obtained Through Two CAD-CAM Technology Scanning Methods - an in vitro Follow-up Study

2019 ◽  
Vol 70 (9) ◽  
pp. 3136-3141
Author(s):  
Marius Negucioiu ◽  
Daniela Popa ◽  
Daniela Condor ◽  
Cristian Culcitchi ◽  
Doina Prodan ◽  
...  
Keyword(s):  
In Vitro Study ◽  
Marginal Fit ◽  
Follow Up Study ◽  
Intraoral Scanning ◽  
Different Types ◽  
Cad Cam ◽  
Hybrid Ceramic ◽  
Electronic Microscope

Our aim in this follow-up in vitro study was to compare differences in marginal fit of inlays fabricated by CAD/CAM technique, using 2 different types of materials (one type of ceramic and one type of hybrid ceramic) and 2 different types of scanning: intraoral scanning (we use quotation marks because of the lack of a true intraoral environment) and model scanning, both performed on a Frasaco Typodont model. Marginal fit measurement was carried out with an electronic microscope at 1000x magnification. Our results proved to be better in the case of the ceramic we used, while model scanning proved to be more accurate than intraoral scanning. The best combination we obtained in terms of marginal fit was found when using ceramic and model scanning.

Ultrastructural Investigations of the Contractile Filaments of Amoebae

1974 ◽  
Vol 32 ◽  
pp. 188-189
Author(s):  
P.L. Moore
Keyword(s):  
Cytoplasmic Streaming ◽  
Three Dimensional ◽  
Freeze Fracture ◽  
Amoeboid Movement ◽  
Different Types ◽  
Chemical Conditions ◽  
Complete Interpretation

Previous freeze fracture results on the intact giant, amoeba Chaos carolinensis indicated the presence of a fibrillar arrangement of filaments within the cytoplasm. A complete interpretation of the three dimensional ultrastructure of these structures, and their possible role in amoeboid movement was not possible, since comparable results could not be obtained with conventional fixation of intact amoebae. Progress in interpreting the freeze fracture images of amoebae required a more thorough understanding of the different types of filaments present in amoebae, and of the ways in which they could be organized while remaining functional.The recent development of a calcium sensitive, demembranated, amoeboid model of Chaos carolinensis has made it possible to achieve a better understanding of such functional arrangements of amoeboid filaments. In these models the motility of demembranated cytoplasm can be controlled in vitro, and the chemical conditions necessary for contractility, and cytoplasmic streaming can be investigated. It is clear from these studies that “fibrils” exist in amoeboid models, and that they are capable of contracting along their length under conditions similar to those which cause contraction in vertebrate muscles.

Freeze-Fracture Replication in the Ultrastructure of Blue-Green Algae

1967 ◽  
Vol 25 ◽  
pp. 74-75
Author(s):  
L. V. Leak
Keyword(s):  
Cell Wall ◽  
Electron Microscope ◽  
Green Algae ◽  
Three Dimensional ◽  
Freeze Fracture ◽  
Electron Microscopic ◽  
Photosynthetic Membranes ◽  
Blue Green Algae ◽  
Cell Biol ◽  
Cellular Components

Electron microscopic observations of freeze-fracture replicas of Anabaena cells obtained by the procedures described by Bullivant and Ames (J. Cell Biol., 1966) indicate that the frozen cells are fractured in many different planes. This fracturing or cleaving along various planes allows one to gain a three dimensional relation of the cellular components as a result of such a manipulation. When replicas that are obtained by the freeze-fracture method are observed in the electron microscope, cross fractures of the cell wall and membranes that comprise the photosynthetic lamellae are apparent as demonstrated in Figures 1 & 2.A large portion of the Anabaena cell is composed of undulating layers of cytoplasm that are bounded by unit membranes that comprise the photosynthetic membranes. The adjoining layers of cytoplasm are closely apposed to each other to form the photosynthetic lamellae. Occassionally the adjacent layers of cytoplasm are separated by an interspace that may vary in widths of up to several 100 mu to form intralamellar vesicles.

A Scanning Electron Microscope Study of Isolated Guard Cells

1973 ◽  
Vol 31 ◽  
pp. 454-455 ◽  
Author(s):  
P. Dayanandan ◽  
P. B. Kaufman
Keyword(s):  
Electron Microscope ◽  
Electron Microscope Study ◽  
Three Dimensional ◽  
Guard Cells ◽  
Scanning Electron Microscope Study ◽  
Psilotum Nudum ◽  
Subsidiary Cells ◽  
Welwitschia Mirabilis ◽  
Cycas Revoluta ◽  
Scanning Electron

A three dimensional appreciation of the guard cell morphology coupled with ultrastjuctural studies should lead to a better understanding of their still obscure dynamics of movement. We have found the SEM of great value not only in studies of the surface details of stomata but also in resolving the structures and relationships that exist between the guard and subsidiary cells. We now report the isolation and SEM studies of guard cells from nine genera of plants.Guard cells were isolated from the following plants: Psilotum nudum, four species of Equisetum, Cycas revoluta, Ceratozamia sp., Pinus sylvestris, Ephedra cochuma, Welwitschia mirabilis, Euphorbia tirucalli and Allium cepa.

A New 1000kv Electron Microscope

1969 ◽  
Vol 27 ◽  
pp. 100-101
Author(s):  
J.L. Williams ◽  
K. Heathcote ◽  
E.J. Greer
Keyword(s):  
Electron Microscope ◽  
Direct Observation ◽  
High Voltage ◽  
Three Dimensional ◽  
Dimensional Structure ◽  
Specimen Thickness ◽  
Voltage Electron ◽  
High Voltage Electron Microscope ◽  
Dynamic Experiments ◽  
Conventional Instrument

High Voltage Electron Microscope already offers exciting experimental possibilities to Biologists and Materials Scientists because the increased specimen thickness allows direct observation of three dimensional structure and dynamic experiments on effectively bulk specimens. This microscope is designed to give maximum accessibility and space in the specimen region for the special stages which are required. At the same time it provides an ease of operation similar to a conventional instrument.

Methods for making stereoslides and -prints, with freeze-etched olfactory epithelium as example

1984 ◽  
Vol 42 ◽  
pp. 704-705
Author(s):  
Bert Ph. M. Menco ◽  
Ido F. Menco ◽  
Frans L.T. Verdonk
Keyword(s):  
Electron Microscope ◽  
Olfactory Epithelium ◽  
Three Dimensional ◽  
Supporting Cell ◽  
Structural Features ◽  
Extensive Study ◽  
Sprague Dawley ◽  
Freezing Method ◽  
Respiratory Epithelia ◽  
Three Dimensional Presentation

Previously we presented an extensive study of the distributions of intramembranous particles of structures in apical surfaces of nasal olfactory and respiratory epithelia of the Sprague-Dawley rat. For the same structures these distributions were compared in samples which were i) chemically fixed and cryo-protected with glycerol before cryo-fixation, after excision, and ii)ultra-rapidly frozen by means of the slam-freezing method. Since a three-dimensional presentation markedly improves visualization of structural features micrographs were presented as stereopairs. Two exposures were made by tiling the sample stage of the electron microscope 6° in either direction with an eucentric goniometer. The negatives (Agfa Pan 25 Professional) were reversed with Kodak Technical Pan Film 2415 developed in D76 1:1. The prints were made from these reversed negatives. As an example tight-junctional features of an olfactory supporting cell in a region where this cell conjoined with two other cells are presented (Fig. 1).

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