oalib
Search Results: 1 - 10 of 100 matches for " "
All listed articles are free for downloading (OA Articles)
Page 1 /100
Display every page Item
Valoración digital de índices de atenuación radiológica de estructuras anatómicas normales y materiales dentales observables en imágenes panorámicas
López-Videla Monta?o,Gianna; Rudolph Rojas,Mauricio; Guzmán Zuluaga,Carmen Lucía;
Revista Facultad de Odontología Universidad de Antioquia , 2009,
Abstract: introduction: the fast technological development applied to medical digital images has opened a new dimension in the qualitative and quantitative assesment of dental and skeletal components, as well as treatment control when biomaterials are used. the knowledge of the mathematical standard profiles and biomaterials used allows the detection of structural alterations such as pathology and dental materials failures. methods: direct digital panoramic images were taken and the numerical absoprtion value of anatomical structures and dental materials most commonly seen in panoramic images were analyzed. results and conclusions: the gray tone scale varied from 0 to 255, corresponding to the value of the tones of pixels observable and dependent on electric current in digital radiographic technology applied to maxillofacial area.
Utilidad de la radiografía panorámica dental digital en la estimación de la edad en adultos Usefulness of dental digital panoramic radiography in the estimation of age in adults  [cached]
M.I. Landa,P.M. Garamendi,M.C. Botella,I. Alemán
Cuadernos de Medicina Forense , 2008,
Abstract: La estimación de la edad constituye un campo de creciente interés dentro de la Medicina Forense. La cuantificación de la reducción de las dimensiones de la cavidad pulpar como consecuencia del proceso de depósito de la dentina secundaria a lo largo de la vida podría servir como un posible indicador de edad. Este fenómeno además de mediante técnicas morfológicas, puede ser analizado mediante la utilización de diferentes técnicas radiográficas. El objetivo principal de este estudio consistió en evaluar la reproducibilidad del método original de cálculo de edad dental desarrollado por Kvaal et al. sobre radiografías panorámicas digitales dentales así como analizar la aplicación de las fórmulas de estimación de edad dental propuestas. Fueron seleccionadas al azar 100 ortopantomografías digitales obtenidas de pacientes de una clínica de Bilbao de edades comprendidas entre 14 y 60 a os. En cada ortopantomografía fueron estudiados tres dientes mandibulares siguiendo la metodología ya descrita. Los resultados obtenidos no confirmaron la reproducibilidad del método desarrollado por Kvaal et al. sobre radiografía digital directa. Los valores tan extremos obtenidos en la estimación de la edad mediante la aplicación de las fórmulas de regresión analizadas sobre las radiografías digitales de esta serie de estudio desaconsejan su aplicación en poblaciones similares a la serie analizada. Estimation of age in individuals has received considerable attention in the forensic literature. The reduction of size of dental pulp cavity as a result of secondary dentin deposit with increasing age could be used as an indicator of age. This regression change, apart from morphological techniques, can also be analysed by radiological techniques. The aim of this work was to evaluate the reproducibility of the original method of Kvaal et al. on digital panoramic radiographs as well as to analyse the application of age estimation formulae reported in the literature. Orthopantomograms (OPGs) of 100 patients aged between 14 and 60 years old from a private radiology department in Bilbao were selected at random. According to the reported technique three mandibular teeth were evaluated in each orthopantomogram. The results showed that the method reported by Kvaal at al. cannot be applied to direct digital OPGs. The values of age estimation obtained using regression formulae analysed on digital images were so distant from the real ages that this method must be discouraged as being a reliable one to estimate age on a direct digital OPGs sample.
Accuracy of digital panoramic regarding interproximal caries detection
Goodarzi Pour D,Nejati S,Fotouhi A
Journal of Dental Medicine , 2011,
Abstract: "nBackground and Aims: Conventional radiological equipments in our country are going to be converted to digital system using computed radiology (CR) technology. If we know the accuracy of digital panoramic radiography for detection of small defects in tooth, it will be useful in cases with difficulty for taking the intraoral radiographs. The aim of this study was to evaluate sensitivity and specificity of digital panoramic radiography for detection of proximal caries compared with the bitewing radiography."nMaterials and Methods: One-hundred patients who had been ordered for taking both bitewing and panoramic radiography were included in this study. Panoramic and then bitewing radiographs were observed by a maxillofacial radiologist and interproximal caries were recorded. Sensitivity and specificity of digital panoramic radiography (CI=95%) was calculated compared with the bitewing radiography as a gold standard."nResults: This study showed that the values for sensitivity and specificity were 62.7% (CI 95%=57.7%-67.5%) and 91.0% (CI 95%=89.2%-92.5%), respectively."nConclusion: Sensitivity of digital panoramic is less than bitewing radiography even with processing before printing. Therefore, bitewing radiography is superior for detection of inter proximal caries.
Evaluation of the styloid process on digital panoramic radiographs  [cached]
More Chandramani,Asrani Mukesh
Indian Journal of Radiology and Imaging , 2010,
Abstract: Background: The styloid process is an anatomical structure, whose clinical importance is not well understood. Proper clinical and radiographic evaluation can detect an elongated styloid process and calcification of the stylohyoid ligament. It has been reported that 2 - 28% of the general population show radiographic evidence of mineralization of a portion of the stylohyoid chain. The elongated styloid process may be symptomatic in many cases. Panoramic radiography is the best imaging modality to view the styloid process bilaterally. Aim: To assess the styloid process on digital panoramic radiographs. Materials and Methods: The study was conducted on 500 digital panoramic radiographs available in the archives of our department as soft copies. These radiographs were taken using a digital panoramic system. The radiographic length of the styloid process was measured on both sides using the measurement toolbars on the accompanying analysis software. For statistical analysis we used the unpaired t test, Chi-square test, and one-way ANOVA test, as necessary. Results: The average length of the left styloid was 25.41 ± 6.32 mm and that of the right styloid was 25.53 ± 6.62 mm. The length of both styloids increased with age and males had longer styloids than females. Elongated styloids were present in 19.4% of the panoramic radiographs. Langlais type I elongated styloids and a partial calcification pattern were more common than others. Conclusion: Panoramic radiography is useful for detection of an elongated styloid process and / or ossification of the stylohyoid ligament in patients with or without symptoms, and helps avoid a misdiagnosis of tonsillar pain or pain of dental, pharyngeal, or muscular origin.
Manejo de las radiaciones ionizantes en instalaciones dentales espa olas: intraorales y panorámicos Use of ionizing radiations in spanish dental equipments: intraoral and panoramic  [cached]
S Jodar,M Alcaraz,Y Martínez-Beneyto,L Pérez
Avances en Odontoestomatología , 2005,
Abstract: El objetivo de este estudio fue determinar las características de la radiología dental en la Comunidad Autónoma de Murcia, con el propósito de poder evaluar el grado de cumplimiento de las recomendaciones Oficiales de la Unión Europea. Para ello se estudian 1822 informes oficiales de control de calidad en radiodiagnóstico dental intraoral y 157 pertenecientes a exámenes panorámicos durante cinco a os consecutivos. Los resultados obtenidos ponen de manifiesto que un tercio de los equipos dentales intraorales revisados presentan averías en su funcionamiento y un 6′24% en el caso de los panorámicos. Solamente un 63.54% de las instalaciones intraorales cumplirían con las recomendaciones oficiales al emplear equipos modernos que funcionan a 70 kVp, 8 mA, 20 cm. de distancia foco piel y 1.5 mm de Al. Se ha producido un descenso del 11.53% en las dosis medias administradas a lo largo del estudio, aumentando la empleada con aparatos panorámicos. La entrada en vigor de esta nueva legislación ha supuesto un descenso en las dosis medias de radiación administradas a los pacientes tras los cinco a os de evolución analizados aunque se sigue incumpliendo las recomendaciones oficiales europeas sobre Protección Radiológica. The aim of the study was to determinate Dental Radiology behaviour in Murcia Community to control the European Union Recommendations. 1822 official reports on quality assurance in intraoral radiology and 155 official reports on panoramic radiology have been studied. The results indicate that one and a half of intraoral radiographic equipments studied and 6′24% in panoramic had alterations. Only the 63′54% of the surgeries achived the European Community Recommendations of intraoral radiology working to 70 kVp, 8 mA and 1.5 mm of Al. There have been a decrease of the intraoral radiation dose exposured. The recent legislation have meant a decrease in the intraoral radiation dose administrated despite of the unachivement of European Community Recommendations.
Comparison of conventional panoramic radiography and panoramic digital subtraction radiography in detection of simulated lesions of mandibular condyle
Panjnoush M.,Ghoncheh Z.,Sarrafzadeh A.
Journal of Dental Medicine , 2008,
Abstract: "n "nBackground and Aim: Digital subtraction Radiography (DSR) is a method of accurate assessing condylar head changes. several studies have been carried out in applying DSR in dentistry, however there is a few number of studies in efficacy of DSR method in assesment of condylar head changes, The aim of this study was to compare panoramic radiography and DSR detecting simulated lesions of the mandibular condyl. "nMaterials and Methods: this was a process reaserch study, in which two dry human skulls with no obvious temporomandibular joint pathology were used. Osteophytic lesions were simulated using three sizes of bone chips that were placed on the medial portion of anterior and superolateral aspects of the condyle. Osteolytic lesions were simulated making 1 and 2 mm holes using round burr in the central portion of anterior aspect and Lateral pole of the condyle. Panoramic radiographs were prepared with and without the lesions in place. These paired radiographs were digitized and digital- subtraction images of the original panoramic images were obtained. Eight observers evaluated 155 images of each modality for the presence or absence and the type of simulated lesions of the mandibular condyle. Sensitivity, specificity, reliability and measure of agreement were analyzed using kappa test and crossed tables and qualitative variables were assess by chi-square and fisher's Exact test. "nResults: Specificity of panoramic and DSR methods were 15.4% and 66.7% respectively. Sensitivity of panoramic and DSR methods were 61.1% and 80.6% for osteophytic lesions and 37.5% and 83.3% for Osteolytic lesions. The percentage of correct decisions made in DSR method was significantly more than conventional panoramic method (82.6% vs 41.9%) (p<0.0001). "nConclusion: Based on the results of this study digital subtraction technique was significantly more accurate than the panoramic radiographs in detection of simulated lesions of the mandibular condyle.
Comparison Ultrasound, Indirect Digital Panoramic Radiography in Differentional Radiolucent Mandible Lesions
Mojdeh Mehdizadeh,Bijan Movahedian,Mahshid Mehdizadeh,Mansoure Babasafari,Parisa Mohammadi
Research Journal of Biological Sciences , 2012,
Abstract: Comparing the accuracy of ultrasound and indirect digital panoramic radiography in diagnosis cystic and tumoral radiolucent mandible lesions. Ten patients aged between 12 and 50 years with jaw bone lesion were selected and consented for the study. Panoramic radiography was obtained and scanned to digital form. Measurements and provisional diagnoses of lesions were made. Preoperative ultrasound and color doppler with probe examination 12 MHz were preformed. Lesion observed for the size, contents, vascular supply and provisional diagnosis made as to whether the lesion was a cyst or tumor. Surgery was performed and histopathological investigation was made which provided the gold standard diagnosis. All measurements and findings compare and analyzed with spss 0.3 software test. Existing all lesions in panoramic radiography were significant. In areas which cortical bone was inadequate thin, ultrasound imaging was significant. In 8 cases: (6 cysts and 2 tumors) ultrasound results ware agreed with histopathological gold standard. But in two cases which cortical bone was not enough thin ultrasound could not diagnose the lesion there was no statistical difference between measurements in two techniques. Ultrasound is an established valuable diagnostic tool for lesions and is noninvasive although panoramic is able to diagnose the existing the legions but can not provide accurate information on the pathological nature of lesions.
Mandibular Canal Duplication Prevalence, Digital Panoramic Radiography Analysis
Schilling Lara,Juan; Schilling Quezada,Alejandro; San Pedro Valenzuela,Jaime;
International journal of odontostomatology , 2010, DOI: 10.4067/S0718-381X2010000300001
Abstract: the increase in the number of surgical procedures in the mandibular region requires a new perspective into anatomical landmarks such as the mandibular canal and its imagenological aspect. the present study aimed to determine the prevalence of the alterations in the number of mandibular canals in digital panoramic images obtained from patients of a private radiological center of the maule region. the study period was from march to december 2008. a total of 350 panoramic digital x-ray images were analyzed by examining them for hemi-mandibles (n = 700) and quantifying the alterations of the number of mandibular canal. there were 35 cases of bifurcations to the mandibular canal, corresponding to 5 % of the sample in the study. the obtained information indicates a major prevalence described by the literature, which reinforces the need of a larger study of the radiographic images of the mandibular canal, considering the difficult managing of a surgical complication on this anatomical structure.
The comparison of subjective image quality in conventional and digital panoramic radiography  [cached]
Peker Ilkay,Toraman Alkurt,Usalan G,Altunkaynak B
Indian Journal of Dental Research , 2009,
Abstract: Objective: The purpose of this study was to compare the subjective image quality of (1) regular intensifying screens with medium intensifying screens, (2) regular intensifying screens with digital radiography, and (3) medium intensifying screens with digital radiography for panoramic radiographs. Materials and Methods: Forty-five patients participated and a total of 90 radiographs were obtained in the study. The patients were divided into three groups (regular-medium intensifying screen, regular intensifying screen-digital radiography, and medium intensifying screen-digital radiography) that consisted of 15 people each. All radiographs were assessed by three oral radiologists independently. The observers evaluated the images using a 3-point scale (1=well visible, 0=partly visible, -1=not or hardly visible) for anatomical structures and pathological findings that are commonly found on panoramic radiographs. Subjective image quality of the groups and comparison of the observers were assessed by using non parametric Kruskal Wallis and Mann-Whitney U tests. Results: For all groups and observers, no statistically significant difference (p>0.05) was found for both anatomical structures and pathologies and between anatomical structures and pathologies according to the Mann Whitney U test. In comparison with observers, no statistically significant difference (p>0.05) was found for both anatomical structures and pathologies and between anatomical structures and pathologies for all groups according to the Kruskal Wallis test. Conclusion: The subjective image quality of medium and regular intensifying screens and conventional and digital panoramic radiographs were found statistically equal in this study.
Comparison between Two Digital Panoramic Radiography Techniques for Proximal Caries Detection
Seyed Hossein Hoseini Zarch,Adineh Javadian Langaroodi,Mina Shafagh Motlagh
Journal of Dental Materials and Techniques , 2013,
Abstract: Introduction: Although proximal dental caries are very common, clinical examinations cannot detect them all. Panoramic radiography has been widely used in dentistry for both diagnosis and screening. This study aimed to investigate and compare the efficacy of two digital panoramic radiography techniques in the diagnosis of proximal caries. Methods: A total number of 60 patients referred to a dental radiology center, all had complete dental system and bitewing radiographies, were included. The patients were randomly divided into two groups of 30 patients. For the first and second groups, CR and DR images were obtained respectively. Images were obtained from the distal of the third tooth to the distal of the eighth. Bitewing images were compared with CR and DR images regarding the detection of caries. Kappa index and chi-squared statistics were employed to analyze the results. Results: There was a high agreement rate between bitewing images and CR (Kappa=0.775) and DR (Kappa=o.762) images in detecting caries. Also no significant difference was shown between CR and DR techniques in the detection of caries (0.543). However, DR and CR images are not efficient enough to be prescribed as the sole imaging technique to detect proximal caries. Conclusion: DR and CR techniques could be good imaging techniques for the detection of dental caries as a companion to clinical examinations.
Page 1 /100
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.