Não foi encontrada diferença (p>0,05) entre as medidas realizadas nas imagens original e positiva, mas ambas diferiram dos valores reais (p<0,05). No statistically significant differences (p>0.05) were found between measurements performed on original and positive images, but both differed significantly from the actual lengths (p0,95) das imagens original e Positive. Intra- and inter-examiner evaluation showed high reproducibility (r>0.95) of both original and positive images. The intra- and inter-examiner agreement was analyzed by intraclass correlation test, and the comparison between the two image groups and the actual lengths by the Student's t-test (α=0.05). After 15 days, they repeated this procedure in 50% of the image samples. Eight radiologists measured the distance between the lower limit of the rubber stop and the tip of the file on both original and positive images. All images were treated with Positive, a digital tool that inverts the grayscale value. Standardized digital images were taken of 40 extracted human permanent single-rooted teeth with K-files size 15 placed at different lengths in the root canal, using the CDR Wireless ® digital system. The aim of this study was to assess the applicability of gray scale inversion in performing digital linear endodontic measurements. IIDepartment of Specific Formation, Area of Radiology, Dental School, UFF - Fluminense Federal University, Nova Friburgo, RJ, Brazil IDepartment of Oral Diagnosis, Piracicaba Dental School, UNICAMP - University of Campinas, Campinas, SP, Brazil Matheus Lima Oliveira I Marcela Lacerda Vieira I Adriana Dibo Cruz II Frab Norberto Bóscolo I Solange Maria de Almeida I Gray scale inversion in digital image for measurement of tooth length A inversão da escala de cinza tem baixa aplicabilidade na realização de mensuração endodôntica, considerando que as medidas não se apresentaram mais acuradas
A análise intra- e interobservador apresentou elevada reprodutibilidade (r>0,95) das imagens original e Positive. A concordância intra- e interobservador foi analisada pelo teste de correlação intraclasse e a comparação entre os dois grupos de imagem e os valores reais, pelo teste t-Student (α=0,05). Após quinze dias, eles repetiram esse procedimento em 50% da amostra. Oito radiologistas mediram a distância entre o limite inferior do stop de borracha e a ponta da lima endodôntica nas imagens originais e positivas. Todas as imagens foram tratadas com Positive, uma ferramenta digital que inverte os valores da escala de cinza.
Quarenta dentes unirradiculares humanos extraídos foram radiografados com limas K tamanho 15 posicionadas no canal radicular em diferentes comprimentos, usando o sistema digital CDR Wireless®. O objetivo deste estudo foi avaliar a aplicabilidade da inversão da escala de cinza na realização de mensurações endodônticas lineares digitais.
Software digital dental radiography Endodontics root canal length determination Gray scale inversion has low applicability in measuring endodontic files, since it did not improve the accuracy of measurements. No statistically significant differences (p>0.05) were found between measurements performed on original and positive images, but both differed significantly from the actual lengths (p<0.05).
Standardized digital images were taken of 40 extracted human permanent single-rooted teeth with K-files size 15 placed at different lengths in the root canal, using the CDR Wireless® digital system.