Intraoral storage phosphor radiography for approximal caries detection and effect of image magnification

Svanaes, D B; Møystad, Anne; Risnes, Steinar; Larheim, Tore A.; Gröndahl, Hans‐Göran

doi:10.1016/s1079-2104(96)80385-4

Cited by 61 publications

(34 citation statements)

References 16 publications

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“…By further specifying the technical parameters to be applied for the monitors, variabilities that may arise from the switching of monitors were avoided [Møystad et al, 1994;Versteeg et al, 1997a]. We selected a constant image size based on previous studies, which indicated a significant difference between approximal caries diagnosis obtained from images with different magnification [Møystad et al, 1995;Svanaes et al, 1996]. Further, in the present study we used black image surroundings because we noted a difference in observer…”

Section: Discussionmentioning

confidence: 99%

“…Digital images generated with a charge-coupled device [White and Yoon, 1997], or storage phosphor techniques [Wenzel et al, 1995;Svanaes et al, 1996] have been shown to be diagnostically comparable to film images for detecting approximal caries in permanent as well as in primary teeth [Nielsen et al, 1996]. er mean A z values were demonstrated in the outer half of enamel (p = 0.01), but no significant differences were found between the modalities for caries lesions penetrating beyond the outer half of the enamel.…”

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confidence: 99%

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Approximal Caries Depth Assessment with Storage Phosphor versus Film Radiography

2000

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Objectives: To study whether caries–specific enhancement of storage phosphor images might improve the observer performance of approximal caries depth assessments compared with film radiography. Materials and Methods: 120 exposures were made of 120 extracted human teeth. To obtain geometrically identical images, Ektaspeed Plus films and storage phosphor plates were exposed simultaneously. The imaging plates were scanned in a Digora^® scanner and the files transferred to a different platform for image enhancement. Nine observers viewed films and storage phosphor images without provisions for adjustment of image intensity and contrast. For each imaging modality, 240 approximal surfaces were rated for caries on a 5–point confidence scale. Definite and probable caries lesions were also rated for lesion depth, and all ratings were compared with the histological state. Diagnostic accuracy was expressed as the area under the ROC curve (A_z value). Paired t tests were used to compare the imaging modalities for diagnostic accuracy and F tests to compare observer variances. Results: Enhanced storage phosphor images demonstrated significantly higher mean A_z values than film (p = 0.0066). Significantly higher mean A_z values were demonstrated in the outer half of enamel (p = 0.01), but no significant differences were found between the modalities for caries lesions penetrating beyond the outer half of the enamel. The number of correctly diagnosed true–positive surfaces with caries in outer enamel was significantly higher with storage phosphor images than with film (p = 0.00014). False–positive surfaces were most frequently registered in the outer enamel with both modalities, but in this region the number of false–positive surfaces was significantly higher with storage phosphor images than with film (p = 0.0038). Pooled sensitivity and specificity values were 0.48/0.94 and 0.61/0.86 for film and storage phosphor images, respectively. The interobserver variability was significantly lower for storage phosphor images than for film. Conclusion: Enhancement of storage phosphor images with a caries–specific procedure significantly improved the accuracy of caries depth assessments in the outer half of the enamel compared with film radiography and reduced observer variability.

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Section: Discussionmentioning

confidence: 99%

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confidence: 99%

Approximal Caries Depth Assessment with Storage Phosphor versus Film Radiography

2000

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“…As bone density, in general, is derived from this attenuation degree, its quantification becomes more precise when one considers the influence of these tissues. The present study tried to confirm the need for reproducing, as closely as possible, in vivo studies 1,2,6,7,9,11,12,21,22 . In these studies the authors made use of materials and samples of animal origin, which would serve as a model to simulate bone, muscle, and fat, with a view to obtaining a better representation of the real situation.…”

Section: Figure 2 -mentioning

confidence: 92%

“…On the other hand, a number of scientific studies 1,2,7,9,12,21,22 have utilized material of different compositions such as acrylic resin, plastic and water as soft tissue simulators.…”

Section: Influência Dos Tecidos Moles Sobre Os Níveis De Cinza Mandibmentioning

confidence: 99%

Influence of soft tissues on mandibular gray scale levels

2004

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The purpose of this study was to analyze the gray levels, expressed in pixels, of the mandibular retromolar region, with regard to the influence of muscular and fat soft tissues near this region. Fifteen dry mandibles were X-rayed with the presence of soft tissue simulators. The radiographs were digitized and evaluated by Digora® software. A one cm thick layer of wax was used as a simulator of the muscular soft tissue. Animal fat samples of different thicknesses - 0.5, 1.0, 1.5 and 2.0 cm - were used as a simulator of the fat soft tissue. Results showed that the fat soft tissue simulator influenced the gray level values in pixels of the mandibular retromolar region when analyzed in different thicknesses using the Digora® digitized image software.

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“…Atualmente, as imagens radiográficas podem ser obtidas por métodos digitais diretos, os quais dispensam a utilização de filmes 11,13,16,17,19 . Estudado em recentes pesquisas 3,4,10,11,12,18,19,22,26,27,30 , o sistema digital Digora apresenta uma imagem composta por vários pontos (pixels) com diferentes tonalidades de cinza, resultante da leitura a laser de uma placa óptica exposta à radiação X 5 . São incipientes os estudos nacionais que tenham por objetivo avaliar o diagnóstico de lesões de cárie por métodos digitais 10,14 .…”

Section: Introductionunclassified

Comparação entre filmes radiográficos e o sistema digital Digora, no diagnóstico de lesões de cárie dentinária em superfície proximal de molares decíduos

Tovo¹,

Vono²,

Tavano

2000

Pesqui. Odontol. Bras.

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TOVO, M. F.; VONO, B. G.; TAVANO, O. Comparação entre filmes radiográficos e o sistema digital Digora, no diagnósti-co de lesões de cárie dentinária em superfície proximal de molares decíduos. Pesqui Odontol Bras, v. 14, n. 4, p. 399-405, out./dez. 2000.O estudo comparou o desempenho diagnóstico dos filmes Agfa M2 e Ektaspeed Plus e do sistema digital Digora. A amostra foi composta por 37 molares decíduos, radiografados em 50, 70 e 90 kV. As imagens de 41 superfícies proximais foram avaliadas sob condições padronizadas. Cinco recursos de edição de imagem (0,5 X, 1 X, 2 X, "Negativo" e 3D), disponíveis no software do sistema digital, foram utilizados. Após a secção dos dentes e a validação em estereomicroscopia (40 X), calculou-se a sensibilidade, especificidade, acurácia e kappa não-ponderado dos métodos. O filme Ektaspeed Plus, exposto a 50 kV, diferenciou-se devido aos valores expressos para sensibilidade, acurácia e kappa não-ponderado. A especificidade dos filmes revelou valores comparáveis. Com a utilização do sistema digital Digora, a taxa de diagnósticos positivo-verdadeiros alcançou maior valor ao ser utilizado o recurso de imagem "Negativo". A imagem comprimida (0,5 X) foi, majoritariamente, a mais específica. As acurácias médias do sistema digital Digora resultaram em valores aproximados. Ao ser utilizada a estatística kappa, não houve distinção entre os recursos de imagem obtidos com o software. O método digital foi mais sensível que os filmes, porém, estes foram mais específicos. A acurá-cia média do sistema digital suplantou a dos filmes. Excetuando-se o Ektaspeed Plus, em 50 kV, os filmes não alcança-ram os valores de kappa demonstrados pelo sistema digital Digora. Cohen's kappa revelou boa concordância intra-examinador (0,758). Devido aos resultados observados, o sistema digital demonstrou-se comparável ao método radiográfico convencional, no diagnóstico de lesões de cárie dentinária em superfícies proximais de molares decíduos.UNITERMOS: Cárie dentária; Diagnóstico por computador; Filme para raios X; Dente decíduo. INTRODUÇÃOA imagem radiográfica interproximal permite condição informativa diferenciada e indispensável para a avaliação do paciente, quando perscrutam-se lesões da doença cárie localizadas em superfícies dentárias contíguas, inacessíveis ao diagnóstico clínico visual.Ao abordar este tema, a Radiologia Odontológi-ca demonstra-se essencialmente bioética, com a busca incessante de conhecimentos que culminem em uma menor dose de radiação aplicada ao paciente aliada à qualidade dos dados obtidos. Exemplo deste propósito é o desenvolvimento de filmes de sensibilidade crescente, a despeito da inexorá-vel e tão discutida perda da nitidez da imagem 8,9,13,15,23 . Nas duas últimas décadas, ao incorporar recursos da computação digital, a Radiologia Odontológica demonstrou uma notável diferenciação tecnológica e potencializou sua condição de um importante recurso diagnóstico auxiliar 25,27,28 . Atualmente, as imagens radiográficas podem ser obtidas por métodos digitais diretos, os quais dispensam...

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Intraoral storage phosphor radiography for approximal caries detection and effect of image magnification

Cited by 61 publications

References 16 publications

Approximal Caries Depth Assessment with Storage Phosphor versus Film Radiography

Approximal Caries Depth Assessment with Storage Phosphor versus Film Radiography

Influence of soft tissues on mandibular gray scale levels

Comparação entre filmes radiográficos e o sistema digital Digora, no diagnóstico de lesões de cárie dentinária em superfície proximal de molares decíduos

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