SEARCH · PubMed Health

Results for “Filing”

Explore indexed PubMed citations for clinical trials, systematic reviews and public health research. Read source abstracts and follow each citation to its original PubMed record.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 73 records · Page 4Linked to original sources

PubMed1975

Chairside decontamination of endodontic files.

Chairside decontamination. of files and reamers is attempted during root canal treatment. The purpose of this study was to evaluate some techniques for reducing the number of microorganisms of artificially contaminated endodontic files. Endodontic files were artificially contaminated with about 10,000 colony-forming units of either B. subtilis spores or S. mitis. The files containing the bacteria were then subjected to various decontamination procedures. Although sterilization was not achieved with any procedure, the bead sterilizer was found to be the most effective decontamination method tested. All gauze wipings showed reductions greater than 90 per cent. It was concluded that wiping with 2 by 2 inch gauze is a highly efficient and practical method of chairside decontamination

1-Propanol↗

PubMed1992

Canal Master files: scanning electron microscopic evaluation of new instruments and their wear with clinical usage.

Canal Master instruments have a short, fluted cutting area and a small flexible shaft; they may be predisposed to rapid wear and breakage. This study examined new and used files as to tip, flute, and shaft design when new and with increasing time of canal preparation. One hundred files prepared 140 curved canals. Sizes #20, #40, and #60 files were examined unused and after 1, 3, 5, and 7 min of use. Evaluation was for uniformity when new and for deterioration and breakage with usage. The smaller sizes (#20 and #40) had some inconsistencies when new and were most predisposed to wear and breakage with time. Findings suggest that smaller files could have had improved quality control by the manufacturer. Also, they should be used with caution and discarded after short times of use in small, curved canals. This should minimize instrument separation and maximize cutting efficiency.

Dental Cavity Preparation↗

PubMed1990

Machining efficiency of endodontic files: a new methodology.

The ability of endodontic files to effectively remove hard tissues is difficult to assess as results from published investigations often vary considerably. An analysis is presented of errors occurring during efficiency assessments. It was found that the machining property varies around the circumference of a single file as well as between various files of the same brand. A new method is proposed for the assessment of the quantity and quality of the machining properties of an endodontic file.

Dental Cavity Preparation↗

PubMed1989

Shaping of simulated root canals in resin blocks using the step-back technique with K-files manipulated in a simple in/out filling motion.

A total of 60 simulated root canals in clear resin blocks of various lengths and degree of curvature were prepared by hand with K-files using a step-back enlargement technique. The instruments were manipulated exclusively with a simple in/out filing or rasping motion with no attempt at rotation or twisting. The preparation technique was assessed by instrumentation time, deformation and fracture of instruments, and loss of working distance. The shape of the prepared canals was assessed by direct inspection and from composite photographic prints produced by superimposing negatives of the canals obtained before and after preparation. In general, the preparations were time-consuming and tedious to complete. Deformation and separation of instruments occurred mainly in those canals with short, severe curves. Loss of working distance was a universal finding and was associated to a degree with the straightening of curved canals inherent in their preparation. Prepared straight canals displayed a continuously tapering form being narrowest at their end-point. On the other hand, prepared curved canals were invariably hourglass in shape. Under the conditions of this study the manipulation of K-files in a simple in/out filing motion proved an unsatisfactory method of preparing simulated curved root canals in resin blocks.

Dental Pulp Cavity↗

PubMed1978

The optimal design of MUMPS global file.

This paper presents the basic consideration of global file design on MUMPS language. The major goal of global design is to reduce the number of disc accesses made over the long-term use of a file. To attain this goal, the procedure for finding the global file which minimizes the average number of disc blocks accessed to obtain a data node is proposed. Furthermore, the total number of blocks in use with file design are demonstrated by simple examples.

Computers↗

PubMedDate not supplied

ADL: an integrated database for filing and study of malignant lymphoma patients.

The filing of clinical data must comply with purposes of logical organization for comparisons and evaluations. ADL (Archives of Data on Lymphomas) is an application program of dBASE III plus (Ashton-Tate) for personal computers, especially suitable for filing and studying patients afflicted with malignant lymphoma. It is subdivided into four data files: general data (private data, stage, therapy); disease data (sites of disease by tests and body area); immunological data (lymphocyte subpopulations, globulin and immunoglobulin dosage, delayed hypersensitivity skin tests); lost patients (register of patients not seen for at least 1 year). It has many utilities (descriptive statistics, clinical report, export service). Congruence checks and verification of names and dates input are included. This program stands as a valuable alternative to more traditional filing systems.

Archives↗

PubMed1990

Electronic determination of root canal length by newly developed measuring device. Influences of the diameter of apical foramen, the size of K-file and the root canal irrigants.

A new electronic root canal measuring device called "ENDEX" which is able to determine the root canal length under moistened conditions using a relative value of different alternative electric currents is discussed in this study. This study is designed to investigate the efficiencies of the new device, in vitro, with respect to change in the root canal environment; namely the influence of the size of K-file, the diameter of the apical foramen and the various root canal irrigants. According to the present study, it was confirmed that the location of the apical foramen was clearly detected under moistened root canal with saline solution using any size of K-file. The locations of the tip of K-files were 0.5 mm inside the apical foramen when the relative value displayed 0.3 Volt, so that the apical constriction could not disturb during root canal measurement. One of the big problem with prior electrical measurement devices was not being able to determine the canal length under moistened conditions. However with this improved device, intracanal irrigants, such as saline, 5% NaOC1, 14% EDTA and 3% H2O2 did not interfere in detecting apical foramen irregardless of the size of K-file and the size of the apical foramen.

Dental Pulp Cavity↗

PubMed1976

The who, why and how of radiology teaching files.

A variety of teaching files in diagnostic radiology is needed to serve a broad spectrum of purposes and students. A method of acquiring a simplified teaching file to be used for and by medical students, non-radiology house staff, first-year radiology residents and senior staff members is described. The medical student, as a learning experience, acts as the procurer of this file.

Filing↗

PubMed1976

The who, why and how of radiology teaching files.

Filing↗

PubMed1978

Powder data file as a tool for identification of dental gold alloys.

In order to obtain data for a prospective powder data file for dental gold alloys X-ray diffraction photograms of 75 different gold alloys were taken using a Guinier-Hägg camera and CuKalpha1 radiation. Before the X-ray photograms were taken the alloys had been heat treated at 700 degrees C, 800 degrees C or 900 degrees C depending on the solidus temperatures of the alloys. The lattice parameters of the samples were determined from the X-ray photograms. These data were supplemented by a specification of the interplanar spacings of the three strongest lines on the diffraction patterns and also by the relative intensities and Miller indices of these lines. An extensive library of reference films is to be collected and this and other details of the file are discussed. It is not intended that the file be used to identify a particular alloy but merely to identify the type of alloy. Thus it can serve as a guide to facilitate the proper selection of gold alloys within practical clinical dentistry.

Filing↗

PubMed1991

Medical reference filing systems.

Low priced shareware packages may be adequate for those whose main need is to index a collection of articles read in journals. Those who search the literature electronically will need a package able to import mass data. Pro-Cite is set up for bibliographic functions only, but Reference File and Notebook II can be used to index any kind of collection, with Reference File having the advantage of being memory-resident. Other reference filing databases being considered for purchase could be measured against those reviewed here.

Abstracting and Indexing↗

PubMed1985

Filing and retrieving a personal collection of 35-mm teaching slides in medicine. A simplified system.

The use of 35-mm slides to teach or supplement lectures has become an important technique in medical education. To be effective, the slide collections need an efficient filing and retrieval system. The systems previously described for filing and retrieval of slides usually are expensive, require many materials and much space, and are more suited for slide libraries and large collections than for personal collections of teaching slides. A more simple and inexpensive system to file and retrieve personal collections of 35-mm teaching slides uses color labels to identify groups of topics and also numbers to identify each slide in a given group. The color labels also help in proper loading of slides into the slide tray. This system can be expanded easily to suit individual needs.

Audiovisual Aids↗

PubMedDate not supplied

Reporting, filing, and retrieval of coronary angiographic findings: a new personal computer-based system.

A software system for semiautomatic reporting and automatic filing of coronary angiographies has been developed and is suitable for an IBM Personal Computer (PC) with graphic tablet and printer. Coronary angiographic findings referring to the native anatomy, pathology, and post-surgical status can be easily recorded. The data is automatically coded and filed according to category of information. This system can analyze previously filed data and perform searches under one or more angiographic findings. This allows for a comparison of different series of patients.

Algorithms↗

PubMed1988

Microcomputer-assisted filing system of cardiac catheterization records using a relational database management system.

To efficiently store and retrieve cardiac catheterization records, we have developed a computer-assisted database, which comprises a 16-bit microcomputer with dual floppy disk drives, a 20 MB random-access memory, hard disk drive, and a line printer. All programmings were accomplished using a relational database management system (R:base 5000, Microrim, Inc.). Data inquiry procedures could be performed with direct operational commands of the system as well as with preprogrammed command files, and final results of searches were printed out with a line printer. The major advantages of the present system described in this report include: (1) the relatively easy and rapid creation of the database, (2) ease of modification of the database structures even after the system design is finished, (3) operational commands in combination with conditional operator(s) are flexible and powerful enough to allow the end user to retrieve data based on various kinds of criteria, (4) a high-level programming language provided by the R:base automates a series of database procedures with relative ease, (5) relational capabilities of the database management system can enhance the possibility of reconstruction of a new data file from a single or several preexisting data files, and (6) the system can be realized at reasonable cost.

Cardiac Catheterization↗

PubMed1991

An innovation in flow cytometry data collection and analysis producing a correlated multiple sample analysis in a single file.

The problems associated with rapid analysis and interpretation of data from multicolor immunofluorescence panels have been a formidable barrier to their routine use. Using present flow cytometry concepts, a panel of 11 tubes each containing multiple phenotypic markers or controls requires postdata acquisition manipulation of many multiparameter histogram and listmode files. We have developed a method that compresses all of the information from such a panel into a single listmode data file during run time. A single data file is used to record the entire phenotypic analysis for a particular patient or series within an experiment. This is accomplished by the incorporation of a tube identifier parameter (TIP) as well as the fluorescence and light scatter parameters normally collected. The TIP can then be used for gating discrimination of any tube or set of tubes within a panel. When the TIP is correlated with the PRISM parameter the entire patient phenotypic image can be represented within a single two-parameter histogram we have called a phenogram. This phenogram can be generated in real time, providing on-line preprocessing of a complex multicolor experiment. By examining the image created by the phenogram it is possible to rapidly flag abnormalities such as incorrect gating. This procedure was carried out on an EPICS Elite flow cytometer in its standard configuration with the addition of hardware to provide an input for the TIP.

Data Collection↗

PubMed1991

Patch-clamp studies on the anomalous mole fraction effect of the K+ channel in cytoplasmic droplets of Nitella: an attempt to distinguish between a multi-ion single-file pore and an enzyme kinetic model with lazy state.

Patch-clamp studies have been employed in order to check whether the assumption of a multi-ion single-file pore is necessary for the explanation of the anomalous mole fraction effect or whether this effect can also be explained by a single-barrier enzyme kinetic model. Experiments in the cell-attached configuration were done on the tonoplast membrane of cytoplasmic droplets of Nitella in solutions containing 150 mol m-3 of K+ plus Tl+ with seven different K+/Tl+ ratios. At first sight, the results seem to support the multi-ion single-file pore, because apparent open channel conductivity displays the anomalous mole fraction effect, whereas open-probability has not been found to be dependent on the K+/Tl+ ratio. Changes in open probability would be expected for a single-barrier enzyme kinetic model with a lazy state. On the other hand, the lazy-state model is more successful in explaining the measured I-V curves. The entire slope of the apparent open channel current-voltage curves rotates with changing K+/Tl+ ratios in the whole voltage range between -100 and +80 mV. Numerical calculations on the basis of multi-ion single-file pores could create the anomalous mole fraction effect only in a limited voltage range with intersecting I-V curves. The apparent absence of an effect on open probability which is postulated by the lazy-state model can be explained if switching into and out of the lazy state is faster than can be resolved by the temporal resolution of 1 msec.

Biological Transport↗

PubMed1991

Radiographic interpretation of endodontic file length.

The purpose of this study was to evaluate the accuracy of examiners when asked to make file length adjustments with only a radiograph. The examiners viewed several radiographs under proper viewing conditions but without the aid of measuring devices. Two files of varying lengths (sizes 10 and 15) were placed in maxillary and mandibular premolars and molars from cadavers. The nine examiners were 67.91% in agreement of actual file length adjustment needed when adjustments of up to 0.5 mm were needed, 17.76% when adjustments of from 0.5 up to 1.0 mm were needed, and 14.33% when adjustments of greater than 1.0 mm were needed.

Dental Pulp Cavity↗

PubMed1989

Electrochemical engineering approach to the irrigation of tooth canals under the influence of a vibrating file.

Doubt exists concerning the irrigation of secondary tooth canals when the vibration of a file introduced into the main root canal is superimposed on flow-through irrigation of the main canal. Depending on the type of commercial equipment used, the vibrations of the file are sonic or ultrasonic. We use the methodology of an electrochemical engineering approach in a study of the intensity of the irrigation of the secondary canals under the influence of sonic and ultrasonic vibrations of a file located at various heights in the main canal. The tooth canals are simulated by small electrochemical cells containing electrodes located at the end of cavities simulating the secondary canals. An electrochemical method is used to measure the mass transfer coefficients at these electrodes, a classical method in electrochemical engineering laboratories. The values of the mass transfer coefficients are representative of the importance of the irrigation of the electrodes. Thus they give a quantitative idea of the vibrations on the irrigation of secondary tooth canals. The work demonstrates the usefulness of the electrochemical engineering approach in contributing to the solution of a biomedical problem.

Electrochemistry↗