Dental X-ray Film Research Articles

Generation of focused electron beam and X-rays by the doped LiNbO3 crystals

Generation of focused electrons beam with energies up to 100keV from undoped LiNbO3 (LN) crystals have been observed [J.D. Brownridge, Nature 358 (1992) 287; J.D. Brownridge, S.M. Shafroth, Appl. Phys. Lett. 79 (2001) 3364] during heating–cooling cycles in a low-pressure environment. This paper reports about similar results that were observed in doped crystals of LN. Generation of electrons by crystals with thicknesses of 1 and 6mm, was visualized by ZnS screen [ZSS] during heating–cooling cycles in a vacuum chamber (P=1–10mTorr). Generation of X-rays from both thin and thick crystals was evident from registered images from dental X-ray film [DXF]. The possibility of X-ray imaging was demonstrated, using different metal masks. Imaging of X-rays reveals that both focusing and wide-angle scattering modes of operation exist in the electron beams generation pattern during heating–cooling cycles.

Dentsply International, Inc.

AbstractMedical Instruments & Equipment (MIC: 9.6 SIC: 3843 NAIC: 339114)Dentsply International designs, develops, manufactures and markets a broad range of products including dental prosthetics, precious metal dental alloys, dental ceramics, endodontic instruments and materials, prophylaxis paste, dental sealants, ultrasonic sealers, dental injectible anesthetics and crown and bridge materials, dental x‐ray equipment, dental handpieces, intraoral cameras, dental x‐ray film holders, film mounts and bone substitute/grafting materials, impression materials, orthodontic appliances, dental cutting instruments and dental implants to the dental market.

Dentsply International, Inc. (NEW)

Mergent's Dividend AchieversVolume 2, Issue 2 p. 79-79 U.S. Company Report Dentsply International, Inc. (NEW)† First published: 22 April 2005 https://doi.org/10.1002/div.2250 † Contact: : John C. Miles II — Chmn. Address: : 221 West Philadelphia Street, York, PA 17405-0872 Web Site: : www.dentsply.com AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat Abstract Medical Instruments & Equipment (MIC: 9.6 SIC: 843 NAIC: 39114) Dentsply International designs, develops, manufactures and markets a broad range of products including dental prosthetics, precious metal dental alloys, dental ceramics, endodontic instruments and materials, prophylaxis paste, dental sealants, ultrasonic scalers, dental injectible anesthetics and crown and bridge materials, dental x-ray equipment, dental handpieces, intraoral cameras, dental x-ray film holders, film mounts and bone substitute/grafting materials, impression materials, orthodontic appliances, dental cutting instruments and dental implants to the dental market. Volume2, Issue2Spring 2005Pages 79-79 RelatedInformation

九州歯科大学におけるOSCEトライアルの評価

The OSCE Trials at Kyushu Dental College for 86 and 94 of fifth year students were individually performed on March 15 and December 6, 2003. The first trial consisted of 5 stations (medical interview, instruction of tooth brushing, rubberdam dry field technique, alginate impression technique, tooth extraction). The second trial consisted of 7 stations (medical interview, dental X-ray film mount, filling of composite resin, root canal treatment, tooth preparation, explanation of the orthodontic appliance, check the vital sign). The average score was 79.4 point in the first and 80.4 point in the second trails, respectively. The average score in clinical skill was lower than that in the medical interview and explanation of the orthodontic appliance. Also, the average score in clinical skill was affected by place and the order of the examination.

Sensitometric and clinical evaluation of a new F-speed dental X-ray film

Sensitometric and clinical evaluation of a new F-speed dental X-ray film

Radiographic detection of approximal caries: a comparison of dental films and digital imaging systems

To compare the diagnostic accuracy for the detection of approximal caries of two dental X-ray films, two CCD-based digital systems and two storage phosphor (SP) digital systems. Fifty-six surfaces in 56 extracted unrestored premolars were radiographed under standardised conditions using two E-speed dental film, Ektaspeed Plus (Eastman Kodak Co, Rochester, NY, USA) and Dentus M2 Comfort (Agfa-Gevaert, Mortsel, Belgium), two CCD systems, Sidexis (Sirona, Bensheim, Germany) and Visualix (Gendex, Milan, Italy) and two SP systems, Digora (Soredex, Helsinki, Finland) and DenOptix (Gendex, Milano, Italy). The images were assessed by eight observers (four radiologists and four general practitioners). True caries depth was determined by histological examination. True caries depth was subtracted from the values given by the observers and an analysis of variance was performed. The null hypothesis was rejected when P < 0.05. No significant differences were found in diagnostic accuracy with the two dental films and the Sidexis and Digora systems. The depth of the lesion significantly affected observer performance. Caries depth was underestimated. Radiologists performed significantly better than general practitioners whatever the recording system. The diagnostic accuracy of digital systems is comparable with that of dental films. The ability of dentists to recognise caries correctly is the main factor contributing to variation in radiographic diagnosis and not the imaging modality.

Evaluation of a new F speed dental X-ray film. The effect of processing solutions and a comparison with D and E speed films

Evaluation of a new F speed dental X-ray film. The effect of processing solutions and a comparison with D and E speed films

Modified Intraoral Film Holders for Postmortem Identification

To date there have not been any commercial dental X-ray film holders marketed to accommodate the special needs of forensic odontologists. Modification of standard Rinn XCP film holders by the investigators produced self-supporting film holders that do not require the active participation from the examinee. The modified film holders greatly simplify the operator's technique of exposing dental radiographs on cadavers.

Sensitometric evaluation of four dental X-ray films using five processing solutions

Sensitometric evaluation of four dental X-ray films using five processing solutions

Processamento radiográfico - câmara escura portátil: relação entre filtro de luz e densidade de base + véu

O objetivo desta pesquisa foi avaliar o efeito sobre a densidade de base + véu de filmes radiográficos, decorrente do uso da luz filtrada pelo polímero acrílico utilizado nas câmaras portáteis para processamento radiográfico. Filmes Kodak Ultra-speed e Ektaspeed Plus foram colocados no interior de uma câmara desse tipo e submetidos durante cinco minutos às condições de iluminação natural e artificial em que elas são rotineiramente utilizadas. Depois disso, os filmes foram processados pelo método temperatura-tempo em câmara escura convencional, juntamente com filmes dos mesmos grupos de sensibilidade que serviram como controle. Os valores densitométricos obtidos das amostras dos filmes foram analisados pelo teste de Mann-Whitney que indicou ao nível de 1% de significância, que os filmes submetidos às condições da câmara portátil apresentaram densidades de base + véu maiores em relação aos grupos controle. Os resultados mostraram que o filme Ektaspeed Plus apresentou valores maiores de densidade de base + véu em comparação com o filme Ultra-speed e que, embora o acrílico filtre a luz de forma similar ao filtro Kodak GBX 2, a maior intensidade de luz no interior da câmara escura portátil ocasionou o aumento na densidade de base + véu.

Evaluation on the Growth of Trabecular Pattern Using Bite-wing Dental X-ray Films

Evaluation on the Growth of Trabecular Pattern Using Bite-wing Dental X-ray Films

Newly designed phantom for visual detection tests of intra-oral x-ray imaging systems

A new phantom set, which consists of ten acrylic plate phantoms with several kinds of holes, was designed for visual detection tests of intra-oral x-ray imagin systems. Detection tests of two kinds of dental x-ray films were performed using three kinds of phantoms, an aluminum test object, Burger's phantom and the new phantom set. Detection-ability curves generated against optical density were compared. Moreover, correlation between the SNR (signal-to-noise ratio) factor and detection ability was analyzed. False positive rates were also compared. To reduce the number of phantom plate that had to be tested in the new phantom set, the number of detected signals for each phantom plate was cumulatively added and statistically compared to the total number of detected signals.

The reliability of dental x-ray film in assessment of MP3 stages of the pubertal growth spurt

The main object of this clinical study is to provide a simple and practical method to assess the pubertal growth spurt stages of a subject by recording MP3 stages with the dental periapical radiograph and the standard dental x-ray machine.(Am J Orthod entofacial Orthop 1998;114:427-9)

Characteristics of the aging rat mandible

The study evaluates the effect of age and sex on the physical characteristics of rat mandible. Wistar derived rats were divided into four groups; young male (4–6 months old), old male (23–25 months old), young female (4–6 months old) and old female (23–25 months old). Mandibles were removed and cleaned of soft tissue, placed on a dental X-ray film and exposed together with an aluminium stepwedge 0.5–3.0 mm. Body weight, and weight, volume, length, base, height, area, density of the mandible were recorded. Also the optical density of the coronoid process, condylar process and mandibular gonion area were measured using a digital densitometer and related to equivalent density of aluminium. Body weight and mandible weight showed age and sex related changes. In most morphometric data there was age but no sex differences. No densitometric differences were found between young or old male or female in the coronoid process, condylar process or gonion. Male rats have greater body weight and mandible weight associated with more food consumption which eventually increased masticatory muscle activity. No missing teeth were noted among male or female aged rats. The results presented here suggest that age-related changes in rat mandible are not general phenomena, but rather specific and limited to some morphometric parameters but not to densitometric parameters. The integrity of the dentition and normal masticatory system activity during aging may be the underlying mechanism.

A Sensitometric Comparison Of Four Dental X-Ray Films And Their Diagnostic Accuracy

Australian Endodontic JournalVolume 24, Issue 1 p. 46-46 A Sensitometric Comparison Of Four Dental X-Ray Films And Their Diagnostic Accuracy First published: 11 February 2010 https://doi.org/10.1111/j.1747-4477.1998.tb00261.xAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat No abstract is available for this article. Volume24, Issue1April 1998Pages 46-46 RelatedInformation

Quality Assurance of Dental X-ray Film Processing in Dental Clinics using a Questionnaire

Quality Assurance of Dental X-ray Film Processing in Dental Clinics using a Questionnaire

Computed dental radiography system versus conventional dental X-ray films for detection of simulated proximal caries

The diagnostic accuracy of intraoral images obtained with a first generation Computed Dental Radiography (CDR) digital dental imaging system is compared with the diagnostic accuracy of conventional dental x-ray film images using a receiver operating characteristics (ROC) analysis. Fifteen dentition phantoms were constructed. Each contained 4 teeth, consisting of premolar and molar teeth with 6 proximal surfaces. Mechanical defects were created randomly on the proximal surfaces and plugged with dentine powder to simulate caries. Fifteen images of each modality were rated by nine dentists in separate sessions according to their confidence in their ability to detect the simulated caries. The images examined were as follows: original CDR images, CDR images magnified 2×, CDR images magnified 4 ×, Ektaspeed Plus dental x-ray film images, and Ultraspeed dental x-ray film images, both unmagnified and magnified 2 ×. A series of ROC curves indicated the limited usefulness of magnification for the CDR system, and consistently similar success in detecting simulated proximal caries for original CDR images and original film images. The magnification of original film images did not always promote greater success than that obtained with the original film images.

In vivo study of approximal caries depth on storage phosphor plate images compared with dental x-ray film

The aim of this in vivo study was to compare approximal caries depth on storage phosphor plate images to conventional film. A Soredex Digora imaging plate was placed in a film bite-wing positioner behind a Kodak Ektaspeed Plus film package without lead foil. The effect of scattered radiation on film without lead foil with a storage phosphor plate at the back was studied in a separate in vitro experiment. Compared with film protected by lead foil, the film showed higher density, but comparable contrast. For the in vivo study, clinical bite-wing exposures were made with the setup described above, with exposure settings for Ektaspeed Plus film. A four-point scale was chosen for approximal caries depth: 0 = no caries; 1 = caries in enamel; 2 = caries reaching dentino-enamel junction; 3 = caries into dentin. The bite-wing film images were shown to a panel of four experts. Sixty surfaces were selected for observer performance, based on identical scorings of the experts consensus classification. Next, six dentists evaluated both film and storage phosphor plate images with the same four point scale. Analysis of variance revealed a significant observer and image modality effect without an interaction effect. In conclusion, caries depth on storage phosphor plate images was underestimated compared with film-based images.

Digitizing of radiographs with a roller-type CCD scanner

Objectives. Roller-type scanners can be used to digitize radiographs. This study evaluated the physical performance of a roller-type scanner with regard to dynamic range, scan reproducibility, and homogeneity. Methods. A VXR-12 (Vidar System Corp., Herndon, Va.) roller-type scanner with imaging editing software Paint Shop Pro (JASC Inc., Minnetonka, Minn.) was used to digitize a step tablet image on Kodak T-MAT G films (Kodak, Rochester, N.Y.). The step tablet image was scanned at various locations and with different scanning settings. The pixel values of the resulting image were analyzed. The step tablet image was also scanned by a Wellhofer WD 102 Filmdensitometer (Wellhofer Dosimetrie, Schwarzenbruck, Germany) to measure the optical densities of the steps on the film for comparison. Results. With the use of the default scanning settings the digitized images had pixel values distributed in a similar dynamic range to that of the film densitometer. This scanner produced consistent images with different scanning positions, different orientation of the images, and different power states of the scanner. Conclusions. This roller-type scanner has a similar dynamic range to that of the film densitometer. The operating condition of the scanner is stable, and the resulting image is not significantly affected by the scanning positions. This type of scanner should be suitable for digitizing dental x-ray films, although the limiting scanning resolution might not be sufficient for some diagnostic purposes.

Base and Fog Densities of Fresh Ektaspeed Plus Dental X-Ray Films

Sewerin IP. Base and fog densities of fresh Ektaspeed Plus dental X-ray films.Previous findings with regard to base and fog density of Ektaspeed Plus dental X-ray films have shown increased values compared with Ektaspeed and Ultra-Speed films, but the results are contradictory. The purpose of the present study was to measure base density, using 10 different fixing solutions, and fog density, using 10 different developing solutions at temperatures varying from 16 to 30°C. The 10 developers tested were intended for manual (three), semiautomatic (three), and automatic (four) processing. Base densities were nearly identical for all fixing products (range, 0.190–0.192). One group of six developers showed quite stable fog values for all temperatures (range, 0.190–0.259), whereas another group (four developers) showed increased values at increasing temperatures (range, 0.395–0.438 at 30°C). It is concluded that base density is within the limits of ISO standards for most Lying products but that some developers result in fog densities that are above ISO standard limits at high temperatures.