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1.
J Vet Sci ; 21(5): e75, 2020 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-33016021

RESUMO

BACKGROUND: Dental diseases are common in dogs and cats, and accurate measurements of dentoalveolar structure are important for planning of treatment. The information that the comparison computed tomography (CT) with dental radiography (DTR) is not yet reported in veterinary medicine. OBJECTIVES: The purpose of this study was to compare the DTR with CT of dentoalveolar structures in healthy dogs and cats, and to evaluate the CT images of 2 different slice thicknesses (0.5 and 1.0 mm). METHODS: We included 6 dogs (2 Maltese and 1 Spitz, Beagle, Pomeranian, mixed, 1 to 8 years, 4 castrated males, and 2 spayed female) and 6 cats (6 domestic short hair,8 months to 3 years, 4 castrated male and 2 spayed female) in this study. We measured the pulp cavity to tooth width ratio (P/T ratio) and periodontal space of maxillary and mandibular canine teeth, maxillary fourth premolar, mandibular first molar, maxillary third premolar and mandibular fourth premolar. RESULTS: P/T ratio and periodontal space in the overall dentition of both dogs and cats were smaller in DTR compared to CT. In addition, CT images at 1.0 mm slice thickness was generally measured to be greater than the images at 0.5 mm slice thickness. CONCLUSIONS: The results indicate that CT with thin slice thickness provides more accurate information on the dentoalveolar structures. Additional DTR, therefore, may not be required for evaluating dental structure in small-sized dogs and cats.


Assuntos
Gatos/anatomia & histologia , Cães/anatomia & histologia , Radiografia Dentária/veterinária , Tomografia Computadorizada por Raios X/veterinária , Alvéolo Dental/diagnóstico por imagem , Animais , Feminino , Masculino
2.
Shanghai Kou Qiang Yi Xue ; 29(4): 431-434, 2020 Aug.
Artigo em Chinês | MEDLINE | ID: mdl-33089297

RESUMO

The announcement of National Health Commission on January 20, 2020 (No.1 of 2020) has included novel coronavirus pneumonia into the B class infectious diseases according to the law of the People's Republic of China on the prevention and control of infectious diseases, and has been managed as A class infectious diseases. People's governments at all levels and health administration departments have been paying high attention to it. With the alleviation of COVID-19 nationwide, dental clinics gradually resume to work. The main transmission routes of COVID-19 are respiratory droplets and contact transmission, hence oral radiological examination is kind of a high-risk operation. Standardized radiologic process is of great significance to reduce the risk of COVID-19 transmission. In accordance with the national and Shanghai epidemic prevention requirements, and in combination with the actual situation of various medical institutions, Oral and Maxillofacial Radiology Committee of Shanghai Stomatological Association formulated the expert consensus on standardized prevention and control of COVID-19 for clinical reference. This recommendation will be updated according to the situation of epidemic prevention and control in China and the new relevant diagnosis and treatment plans.


Assuntos
Infecções por Coronavirus , Pandemias , Pneumonia Viral , Radiografia Dentária , Betacoronavirus , China , Consenso , Humanos
3.
Leg Med (Tokyo) ; 47: 101787, 2020 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-32992157

RESUMO

This study was aimed at investigating and comparing exposure dose of workers and the surrounding workers. In addition, worker's exposure was also measure about lens and finger. Four intraoral portable X-ray units were evaluated. The stray radiations were measured using Pitman 37D and ionization chamber (Pitman). MyDosemini (ALOKA) was used for measurement of the finger exposure dose. Without the shield became high in anterior 0.5 m. Comparing the air dose for the four models used in this study showed a high tendency for the two NOMAD models. And using the shields, the images could be taken 4.6 times of the baseline at a maximum and 3.6 times on average. The finger radiation exposure dose was low with both of the NOMAD models, with no significant difference found. By setting the baseline value without a shield, finger radiation exposure when using a shield was lower than the detection limit for the D3000, and was reduced by approximately 94-96% for other three models. All models can photograph around 100 bodies, so it is considered that it is not necessary to switch out the operator considering the operation limit. But even if it does not reach the operation limit, the stochastic effects of radiation exposure can be increased as well as the deterministic effects of the operation limit. The operator and the surrounding workers seek to protect themselves. It is important to perform exposure management that takes into account the stochastic effects to the operator and the surrounding workers.


Assuntos
Exposição Ocupacional/efeitos adversos , Exposição Ocupacional/análise , Doses de Radiação , Radiografia/efeitos adversos , Radiografia/instrumentação , Dedos , Humanos , Cristalino , Exposição Ocupacional/prevenção & controle , Imagens de Fantasmas , Equipamentos de Proteção , Radiografia Dentária
4.
AJR Am J Roentgenol ; 215(4): 945-953, 2020 10.
Artigo em Inglês | MEDLINE | ID: mdl-32783561

RESUMO

OBJECTIVE. The purpose of this study was to determine in a phantom the dose exposure of different dental 3D sectional imaging methods (CT and cone-beam CT [CBCT]) and different CT protocols. The aim was to establish optimal protocols with the lowest possible dose and diagnostically high image quality with special consideration given to tin prefiltration. MATERIALS AND METHODS. Dose was determined with thermoluminescence detectors at 20 different measuring points on an anthropomorphic phantom. Eight different CT protocols with and without tin filtering were compared with iterative reconstruction methods and a standard CBCT protocol. Objective and subjective image evaluations and a figure-of-merit analysis of the image data were performed by radiologists and maxillofacial surgeons. RESULTS. The determined dose-length products of the nine examinations were 5.0-111.9 mGy · cm with a calculated effective whole body dose of 20.7-505.9 µSv. Cone-beam CT was in the upper midfield with an effective dose of 229.3 µSv. On the basis of dose, objective image quality, and clinical evaluation results, tin filter protocols performed best. Protocols with higher doses were significantly less useful in the figure of merit comparison but because of their detailed bony representation are particularly necessary to answer certain questions about trauma and tumors. CONCLUSION. The use of tin filtering can reduce dose in dental CT examinations, compared with standard low-dose examinations, while maintaining good image quality. The dose performance is significantly inferior even to that of a cone-beam CT examination. High-dose protocols are necessary only for certain questions.


Assuntos
Tomografia Computadorizada de Feixe Cônico , Cabeça/diagnóstico por imagem , Imageamento Tridimensional , Tomografia Computadorizada Multidetectores , Doses de Radiação , Radiografia Dentária , Protocolos Clínicos , Humanos , Imagens de Fantasmas , Estanho
5.
Br Dent J ; 229(2): 105-109, 2020 07.
Artigo em Inglês | MEDLINE | ID: mdl-32710056

RESUMO

Due to the coronavirus pandemic, all routine dental care in the UK ceased on 25 March 2020. Liverpool University Dental Hospital (LUDH) responded by commencing an emergency dental service on the same date. Clinicians were redeployed within the Hospital to meet the needs of the service, including staffing of the radiology department. LUDH followed Royal College recommendations by taking extraoral radiographs in preference to intraoral radiographs due to the risk of inducing an aerosol. Issues were identified with clinical diagnosis from sectional panoramic radiographs, which led to the introduction of extraoral bitewings being taken as an alternative. A quality assurance audit found that these images provided a substantially lower radiation dose and produced excellent quality images with improved diagnostic accuracy. This article aims to summarise how our radiography practices changed in response to the coronavirus and how the lessons that we have learnt provide an opportunity to modify and improve future practice, beyond the pandemic.


Assuntos
Infecções por Coronavirus , Pandemias , Pneumonia Viral , Betacoronavirus , Humanos , Radiografia Dentária , Radiografia Panorâmica
6.
Orv Hetil ; 161(30): 1260-1265, 2020 07.
Artigo em Húngaro | MEDLINE | ID: mdl-32653869

RESUMO

Surgical guides and three-dimensional (3D) planning softwares used in everyday dental implantology open new possibilities in other fields of dentistry. While using the operation microscope in endodontic microsurgery provides more precise apicectomy, there is still no consent on the exact localisation and size of the bony window to be prepared for this surgery. Our aim is to describe a new, guided endodontic microsurgery method when osteotomy and apicectomy are planned in a 3D software and performed with a trephine bur. Based on data from Cone Beam Computed Tomography, planning of the surgical guide was performed with a 3D planning software (Smart Guide, dicomLAB, Hungary) in order to define the size of the bony window, the angulation and the depth of the trephine bur during the apicectomy. After preparing a mucoperiosteal flap, with the help of the dentally supported surgical guide, the trephine bur removes the cortical bone and the apex of the root simultaniously. Following the modern microsurgical protocol, after performing the ultrasonic retrograde preparation, mineral trioxide aggregate (ProRoot MTA; Dentsply Maillefer, Ballaigues, Switzerland) is placed as a retrograde filling to close the resected area. After the uneventful healing period, a complete bony regeneration can be seen on the 1-year follow up X-ray. The patient is symptom-free. This technique is considered to be faster and more precise than the non-guided endodontic microsurgery carried out without the utilization of a trephine bur. Orv Hetil. 2020; 161(30): 1260-1265.


Assuntos
Apicectomia/métodos , Tomografia Computadorizada de Feixe Cônico/métodos , Cavidade Pulpar/cirurgia , Endodontia/métodos , Microcirurgia/métodos , Osteotomia/métodos , Impressão Tridimensional , Materiais Restauradores do Canal Radicular , Tratamento do Canal Radicular/métodos , Compostos de Alumínio , Compostos de Cálcio , Cavidade Pulpar/diagnóstico por imagem , Combinação de Medicamentos , Humanos , Hungria , Óxidos , Radiografia Dentária , Silicatos , Dente , Resultado do Tratamento , Procedimentos Cirúrgicos Ultrassônicos
7.
Niger J Clin Pract ; 23(7): 1026-1029, 2020 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-32620736

RESUMO

When teeth have responded poorly to conventional endodontic treatment or when they cannot be treated adequately by nonsurgical means, surgical endodontics remains the treatment of choice. Healing of apical lesions occurs by repair, most of the time. "Repair is the healing of a wound by tissue that does not fully restore the architecture or function of the affected unit". Since this is not ideal, newer regenerative procedures that aim to restore lost tissue have been introduced. ß -Tricalcium phosphate is an alloplastic bone graft material that forms a scaffold for closing the bony defect. It is osteoconductive. Platelet-rich plasma (PRP) and platelet-rich fibrin (PRF) are platelet concentrates, rich in growth factors and they promote regeneration by osteoinduction. This article describes cases of bone augmentation with a combination of PRP + ß -TCP and PRF + ß -TCP for treatment of the chronic periapical lesion. The cases were followed for six months and one year and healing was evaluated quantitatively using cone beam computed tomography.


Assuntos
Fosfatos de Cálcio/uso terapêutico , Tomografia Computadorizada de Feixe Cônico/métodos , Fibrina Rica em Plaquetas , Plasma Rico em Plaquetas , Adulto , Regeneração Óssea , Transplante Ósseo , Feminino , Humanos , Radiografia Dentária , Ápice Dentário/diagnóstico por imagem , Ápice Dentário/cirurgia , Colo do Dente/patologia , Resultado do Tratamento , Cicatrização
8.
Oral Radiol ; 36(4): 395-399, 2020 10.
Artigo em Inglês | MEDLINE | ID: mdl-32601787

RESUMO

Dental professionals have always been meticulous about infection control due to high risk of cross-contamination during dental procedures. Nevertheless, there is an urgent need to review and revise our current practice of infection control and develop more strict protocols that will prevent nosocomial spread of infection during COVID-19 outbreak and future pandemics. The risk of contamination is high during dental radiography if proper disinfection techniques are not applied. This document provides advice and guidance for infection control when practicing dental radiography during COVID-19 pandemic.


Assuntos
Infecções por Coronavirus/epidemiologia , Controle de Infecções/métodos , Pneumonia Viral/epidemiologia , Radiografia Dentária/normas , Betacoronavirus , Infecções por Coronavirus/prevenção & controle , Humanos , Pandemias/prevenção & controle , Pneumonia Viral/prevenção & controle
9.
Oral Radiol ; 36(4): 400-403, 2020 10.
Artigo em Inglês | MEDLINE | ID: mdl-32638200

RESUMO

The current coronavirus disease 2019 (COVID-19) outbreak has brought substantial challenges to the world health system, including the practice of dental and maxillofacial radiology (DMFR). DMFR will carry on an imperative role in healthcare during this crisis. This rapid communication has collected and evaluated all the best current evidence and published guidelines as well as professional recommendations to help maxillofacial radiologists and dental practitioners for safer radiological and imaging examinations on healthy, suspected, or confirmed COVID-19 patients during outbreak. Some strategies have been depicted including procedural indications, infection control, and correct employment of personal protection equipment along with evoking the proper practice environment during and after the COVID-19 outbreak.


Assuntos
Infecções por Coronavirus/epidemiologia , Controle de Infecções/métodos , Pneumonia Viral/epidemiologia , Radiografia Dentária , Betacoronavirus , Infecções por Coronavirus/prevenção & controle , Odontólogos , Humanos , Pandemias/prevenção & controle , Equipamento de Proteção Individual , Pneumonia Viral/prevenção & controle , Papel Profissional , Radiologistas
10.
Medicine (Baltimore) ; 99(26): e20787, 2020 Jun 26.
Artigo em Inglês | MEDLINE | ID: mdl-32590758

RESUMO

Convolutional neural networks (CNNs), a particular type of deep learning architecture, are positioned to become one of the most transformative technologies for medical applications. The aim of the current study was to evaluate the efficacy of deep CNN algorithm for the identification and classification of dental implant systems.A total of 5390 panoramic and 5380 periapical radiographic images from 3 types of dental implant systems, with similar shape and internal conical connection, were randomly divided into training and validation dataset (80%) and a test dataset (20%). We performed image preprocessing and transfer learning techniques, based on fine-tuned and pre-trained deep CNN architecture (GoogLeNet Inception-v3). The test dataset was used to assess the accuracy, sensitivity, specificity, receiver operating characteristic curve, area under the receiver operating characteristic curve (AUC), and confusion matrix compared between deep CNN and periodontal specialist.We found that the deep CNN architecture (AUC = 0.971, 95% confidence interval 0.963-0.978) and board-certified periodontist (AUC = 0.925, 95% confidence interval 0.913-0.935) showed reliable classification accuracies.This study demonstrated that deep CNN architecture is useful for the identification and classification of dental implant systems using panoramic and periapical radiographic images.


Assuntos
Algoritmos , Implantes Dentários , Diagnóstico por Computador/métodos , Redes Neurais de Computação , Radiografia Dentária/métodos , Aprendizado Profundo , Implantes Dentários/classificação , Implantes Dentários/normas , Humanos , Projetos Piloto , Radiografia Panorâmica/métodos , Reprodutibilidade dos Testes , Resultado do Tratamento
11.
Oral Radiol ; 36(4): 404-405, 2020 10.
Artigo em Inglês | MEDLINE | ID: mdl-32564186

RESUMO

This letter addresses the challenges for the dental radiology clinic in times of the COVID-19 pandemic. It highlights the use of teleradiography and mobile devices, as well as the proper care in disinfecting these equipments. As there are still no specific therapies for COVID-19, biosafety measures that promote containment and prevent the spread of the virus are crucial to stop the outbreak and control a possible new infectious peak.


Assuntos
Infecções por Coronavirus/epidemiologia , Desinfecção , Contaminação de Equipamentos/prevenção & controle , Pneumonia Viral/epidemiologia , Radiografia Dentária , Betacoronavirus , Infecções por Coronavirus/prevenção & controle , Humanos , Controle de Infecções , Pandemias/prevenção & controle , Pneumonia Viral/prevenção & controle
12.
Eur Arch Paediatr Dent ; 21(4): 463-508, 2020 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-32557182

RESUMO

PURPOSE: To evaluate the effectiveness of all radioprotective measures in underage patients who undergo a dental radiodiagnostic examination. METHODS: A systematic review was performed including randomised controlled trials (RCTs), or cluster trials, cohort studies, cross-sectional studies, case-control studies and comparative in vitro research. These studies examined the healthy underage human population (below 18 years) undergoing a dental radiodiagnostic examination. All radioprotective measures were included except for justification as an intervention. The primary outcomes were in vivo mortality and morbidity. Some surrogate or indirect outcomes such as in vitro effective dose and organ absorbed doses were also accepted. Secondary outcomes with regards to image quality and therapeutic value were also analysed. RESULTS: Eighteen papers were eligible for implementation. Fifteen studies underwent narrative synthesis. Regression analysis was performed on three studies. CONCLUSION: The following radioprotective measures can reduce the exposure dose. For lateral cephalometry: collimation, filtration, the fastest receptor type and circumstantial thyroid shielding. For oblique lateral radiographs: the shortest exposure time, a smaller horizontal angulation, a longer focus to skin distance. For intraoral radiography: rectangular collimation, the fastest image receptor speed and thyroid shielding when the thyroid gland is in line of or very close to the primary beam. For panoramic radiographs: collimation, the fastest receptor type and the use of automatic exposure control (AEC) or manual adjustment of intensity. For cone-beam computed tomography: collimation, the largest voxels size in relation to the treatment need, change in image settings such as ultra-low dose settings, shorter exposure time, a lower amount of projections, lower beam intensity, reduction of the potential, use of a thyroid shield except in two situations and the use of AEC. All of the changes in exposure parameters should be performed while maintaining a sufficient therapeutic value on an individual and indication-based level.


Assuntos
Proteção Radiológica , Radiografia Dentária , Cefalometria , Criança , Humanos , Doses de Radiação , Radiografia Panorâmica
13.
Int. j. odontostomatol. (Print) ; 14(2): 154-159, June 2020. tab
Artigo em Espanhol | LILACS | ID: biblio-1090668

RESUMO

El tratamiento endodóntico tiene como finalidad prevenir o lograr la ausencia de periodontitis apical post-tratamiento, logrando la mantención del diente en la boca de manera funcional. La realización de tratamientos endodónticos de baja complejidad en la formación de pregrado es transversal a todas las universidades chilenas. El objetivo del presente estudio es evaluar la frecuencia de éxito de tratamientos endodónticos realizados por estudiantes de pregrado entre los años 2014-2017 de la Escuela de Odontología, Universidad Austral de Chile (UACh), Valdivia, Chile. Se realizó un estudio observacional descriptivo donde fueron evaluados 74 tratamientos endodónticos en dientes uniradiculares de 63 pacientes seleccionados a través de un muestreo aleatorio simple, que cumplieran con los criterios de selección. Los parámetros usados para la evaluación clínica fueron: ausencia de dolor a la palpación y percusión, ausencia de fístula y diente en función. En la evaluación radiográfica se utilizaron los siguientes parámetros: longitud de obturación en relación al ápice dentario, conicidad, densidad del material obturador y reducción de la lesión periapical. De los tratamientos evaluados se reportó un 78 % de éxito clínico y un 41 % de éxito radiográfico. Finalmente, se concluye que los resultados obtenidos a nivel clínico y radiográfico son similares a los reportados en la literatura.


The objective of endodontic treatment is to prevent or achieve the absence of post-treatment apical periodontitis, thereby maintaining functionality of the tooth in the mouth. In Chilean universities undergraduate programs, training in endodontics is limited to low level complexity cases and is transversal throughout the universities. The objective of this study is to evaluate the frequency of success of endodontic treatments performed by undergraduate students between the years 2014-2017 of the School of Dentistry, Universidad Austral de Chile (UACh), Valdivia, Chile. A descriptive observational study was conducted where 74 endodontic treatments were evaluated in uniradicular teeth of 63 patients, selected through a simple random sampling, that met selection criteria. The criteria used for the clinical evaluation were: absence of pain on palpation and percussion, absence of fistula and function tooth. In the radiographic evaluation the following criteria were used: length of obturation in relation to the dental apex, taper, density of the obturator material and reduction of the periapical lesion. Of the treatments evaluated, 78 % clinical success and 41 % radiographic success were reported. Finally, it is concluded that the results obtained at clinical and radiographic level are similar to those reported in the literature.


Assuntos
Humanos , Masculino , Feminino , Adolescente , Adulto , Pessoa de Meia-Idade , Adulto Jovem , Obturação do Canal Radicular/estatística & dados numéricos , Estudantes de Odontologia , Dor Pós-Operatória , Periodontite Periapical , Periodontite , Materiais Restauradores do Canal Radicular , Obturação do Canal Radicular/efeitos adversos , Faculdades de Odontologia , Radiografia Dentária , Chile , Epidemiologia Descritiva , Resultado do Tratamento , Educação de Graduação em Medicina , Endodontia/educação
14.
Niger J Clin Pract ; 23(5): 631-637, 2020 May.
Artigo em Inglês | MEDLINE | ID: mdl-32367869

RESUMO

Background: Replantation of avulsed teeth is an invasive treatment approach where patient cooperation is required after the risks are explained to the patient or family. Although replantation of an avulsed permanent teeth is an accepted treatment approach, the long-term prognosis of the replanted teeth is still controversial. This report describes the survival of delayed replanted 15 incisors that was stored in unfavorable conditions after avulsion. Materials and Methods: Nine patients, aged 8-12 years, were referred to the Inonu University, Pediatric Dentistry Department with traumatically avulsed incisors. The parents were informed about the possible complications of a delayed replantation. Results: Forty percent of the teeth were splinted with flexible orthodontic wire and composite. The follow-up periods were varied from 24 to 48 months. The mean follow-up periods were 33.3 ± 8 months. 40% of the teeth were retained in the mouth for at least 3 years and contributed to alveolar bone development. In these cases, the most common complication (9 teeth, 60%) was replacement root resorption. Two of the 15 teeth which had wide open apices, continued to the root development. Conclusion: In this study, replanted teeth were retained in the mouth for at least 2 years and contributed to the patient's development. Therefore, this study has shown that delayed replantation of an avulsed tooth for a child is still worthwhile, even in cases of poor prognosis where the tooth had extended extra-alveolar dry storage. We believe that delayed replantation should be done because of its importance for the child's jaw and facial development.


Assuntos
Incisivo/lesões , Avulsão Dentária/cirurgia , Reimplante Dentário , Criança , Dentição Permanente , Feminino , Humanos , Incisivo/diagnóstico por imagem , Incisivo/cirurgia , Masculino , Pais , Radiografia Dentária , Reabsorção da Raiz/etiologia , Reabsorção da Raiz/prevenção & controle , Preservação de Tecido/métodos , Anquilose Dental , Avulsão Dentária/diagnóstico por imagem , Avulsão Dentária/fisiopatologia , Resultado do Tratamento
15.
Dentomaxillofac Radiol ; 49(6): 20190290, 2020 Sep 01.
Artigo em Inglês | MEDLINE | ID: mdl-32453610

RESUMO

OBJECTIVES: The purpose of this study was to compare the accuracy of imaging techniques in diagnosing periapical lesions. METHODS: Imaging records of 80 patients (51 females, 29 males, aged between 14 and 75 years) including periapical and panoramic radiographs and ultrasonographic images were selected from databases of Selcuk University Dentistry Faculty. Periapical radiographs were accepted as gold-standard and 160 anterior maxillary and mandibular teeth with or without periapical lesion were included to the study. Three specialist observers (dental radiologists) evaluated the presence and appearance of periapical lesions on panoramic radiograph and ultrasonographic images.Sensitivity, specificity, positive predictive value, negative predictive value and diagnostic value of panoramic radiographs and ultrasonography were determined. RESULTS: Sensitivity was 0.80 and 0.77 for ultrasonographic images and panoramic radiographs, respectively which shows that periapical lesion was correctly detected in 80% of the cases with ultrasound and in 77% of the cases with panoramic radiography. Specificity values were determined as 0.97 for ultrasound and 0.95 for panoramic radiography. Overall diagnostic accuracy was 0.86 and 0.84 for ultrasound and panoramic radiography, respectively. CONCLUSIONS: Periapical and panoramic radiographs are commonly used to visualize periapical lesions. Besides, ultrasonography is an alternative method to digital radiographic techniques in the diagnosis of anterior teeth with periapical lesions.


Assuntos
Radiografia Dentária Digital , Radiografia Dentária , Adolescente , Adulto , Idoso , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Radiografia Panorâmica , Sensibilidade e Especificidade , Ultrassonografia , Adulto Jovem
16.
PLoS One ; 15(5): e0223941, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32469952

RESUMO

Expert behavior is characterized by rapid information processing abilities, dependent on more structured schemata in long-term memory designated for their domain-specific tasks. From this understanding, expertise can effectively reduce cognitive load on a domain-specific task. However, certain tasks could still evoke different gradations of load even for an expert, e.g., when having to detect subtle anomalies in dental radiographs. Our aim was to measure pupil diameter response to anomalies of varying levels of difficulty in expert and student dentists' visual examination of panoramic radiographs. We found that students' pupil diameter dilated significantly from baseline compared to experts, but anomaly difficulty had no effect on pupillary response. In contrast, experts' pupil diameter responded to varying levels of anomaly difficulty, where more difficult anomalies evoked greater pupil dilation from baseline. Experts thus showed proportional pupillary response indicative of increasing cognitive load with increasingly difficult anomalies, whereas students showed pupillary response indicative of higher cognitive load for all anomalies when compared to experts.


Assuntos
Cognição/fisiologia , Movimentos Oculares/fisiologia , Memória de Curto Prazo/fisiologia , Percepção Visual/fisiologia , Adulto , Atenção/fisiologia , Feminino , Humanos , Aprendizagem/fisiologia , Masculino , Pessoa de Meia-Idade , Pupila/fisiologia , Radiografia Dentária/psicologia , Radiografia Panorâmica/psicologia
18.
Top Companion Anim Med ; 38: 100369, 2020 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-32115079

RESUMO

The objective of this study was to collect preliminary data about tooth resorption (TR) from cats treated at the Odontology Service (September 2016-June 2018), part of a University Veterinary Hospital in Spain, with specific emphasis on TR distribution per tooth. Diagnosis was based on visual/tactile inspection and intraoral dental radiographs. This cross-sectional study was carried out on 59 adult cats (27 females, 32 males). TR occurred in 39/59 cats (66.1%; 95% CI: 54.0%-78.2%). The median number of lesioned teeth per TR-affected animal was 3. A highly significant but weak correlation was found for age and number of TR-affected teeth per individual (Spearman´s correlation ρ = 0.381, P = .003, power = 0.853; N = 59). No TR cases were detected in incisors (0/708, 0%) but TR occurred in canines (21/236, 8.9%; 95% CI: 5.4%-12.4%), premolars (78/590, 13.2%; 95% CI: 10.5%-15.9%), and molars (33/236, 14%; 95% CI: 9.7%-18.3%). A significant age influence on TR was found. The greatest TR occurrence corresponded to 307 (21/59; 35.6%; 95% CI: 23.4%-47.8%) followed by 409 (17/59; 28.8%; 95% CI: 17.2%-40.3%), 407 (16/59; 27.1%; 95% CI: 15.7%-38.4%), and 309 (16/59; 27.1%; 95% CI: 15.7%-38.4%). These teeth would be considered as TR-sentinels in the studied population. These findings are relevant for veterinarians working in dental clinics, where the TR prevalence may be high especially in older cats.


Assuntos
Doenças do Gato/patologia , Reabsorção de Dente/veterinária , Fatores Etários , Animais , Doenças do Gato/diagnóstico por imagem , Gatos , Estudos Transversais , Feminino , Masculino , Radiografia Dentária/veterinária , Espanha , Reabsorção de Dente/diagnóstico por imagem , Reabsorção de Dente/patologia
19.
Artigo em Inglês | MEDLINE | ID: mdl-32028674

RESUMO

Purpose: To compare the aspect of the reproduction accuracy in studied methods of determination of the (CR) of jaws using the digital research methods. The methods used were bilateral manipulation by P.E. Dawson, frontal deprogrammer, leaf gauge, and intraoral device for recording of Gothic arch angle. Methods: To determine the reproduction accuracy of the centric relation of jaws, we examined 5 patients with intact dentition in a prosthetic dentistry clinic (first class in Angle's system). For each method, 20 registrations of the centric jaw relation were carried out by one operator. The breaks between definitions were 30 minutes. A total of 400 CR recording operations were carried out (400 records of CR). In order to study the reproducibility of CR determination methods, 200 recorded mandible positions were analyzed by means of an analog-to-digital method (a macro kit Canon 650D, Canon 60 mm macro IS USM f2.8, Canon macro ring MR-14 EX and the computer program Adobe Photoshop) to assess the first occlusal contact obtained in the CR of jaws, while the other 200 were analyzed by means of a digital method (the computer program Avantis for 3D modeling, Prime as a laboratory 3D scanner (DOF), and Trios as an intraoral scanner (3Shape)) to assess the spatial position of the mandible in the CR. Statistical analysis was carried out using STATISTICA-10. In all statistical analysis procedures, the critical significance level p was assumed to be 0.05. Results: In the study of the data by means of the computer program Avanti 3D, the reproducibility of the mandible position in the CR reached 0.119 ± 0.012 mm for frontal deprogrammer, 0.225 ± 0.028, p ≤ 0.05 for bilateral manipulation by Dawson P.E., 0.207 ± 0.02, p ≤ 0.05 for leaf gauge, and 0.120 ± 0,013, p ≤ 0.05 using an intraoral device for recording the Gothic arch angle. The analog-to-digital method showed an identical tendency for reproduction of the mandible position. Conclusions: The digital analysis we made using the Avantis 3D program showed, with high confidence, that the maximum reproducibility of the CR position was reached by using our own design frontal deprogrammer and the device for recording Gothic arch angle.


Assuntos
Relação Central , Mandíbula , Radiografia Dentária Digital , Radiografia Dentária , Projetos de Pesquisa , Humanos , Mandíbula/diagnóstico por imagem , Radiografia Dentária/métodos , Radiografia Dentária/normas , Radiografia Dentária Digital/normas , Reprodutibilidade dos Testes , Projetos de Pesquisa/normas
20.
Radiologe ; 60(1): 77-92, 2020 Jan.
Artigo em Alemão | MEDLINE | ID: mdl-31919535

RESUMO

Despite the increasing use of modern digital cross-sectional imaging techniques (especially digital volume tomography) in dental X­ray examinations, orthopantomography remains the widely available, commonly used basic imaging modality for evaluating dental status prior to extensive treatment. It is also used for inflammatory and tumorous odontogenic osseous pathologies which are demonstrated with typical imaging findings. The classical X­ray tomography principle has been further developed for the presentation of the differently wide, shape variants of dental arches. The examination unit, consisting of a rigidly connected X­ray tube and detector, runs on an elliptical path around the facial skull. Thereby different rotation centers are controlled. Due to the different distances of the jaw sections to the X­ray tube and the image receiver, differencing velocities result and thus blurring effects as the basis of the layer or slice representation. Slit collimators lead to a narrow and continuous line-like representation of the different widths of the dental arch.


Assuntos
Radiografia Dentária/métodos , Radiografia Panorâmica , Humanos
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