Avaliação de quatro métodos de visualização de imagens digitais em odontologia
Abstract
Baseado nos grandes benefícios que a utilização das imagens digitais pode proporcionar a Odontologia, o objetivo deste trabalho foi comparar a qualidade de quatro métodos de visualização de imagens em Odontologia. Foram selecionados quatro slides 35 mm de pacientes da Faculdade de Odontologia da Pontifícia Universidade Católica de Minas Gerais. Os diapositivos foram digitalizados por quatro recursos e, posteriormente, as imagens foram processadas para serem visualizadas por quatro métodos: (1) revelação digital em papel fotográfico; (2) impressão em papel fotográfico com impressora jato de tinta amadora; (3) tela de computador e (4) projetor de multimídia. Posteriormente, essas imagens foram submetidas à avaliação de quinze indivíduos, sorteados aleatoriamente, divididos em cinco grupos. Para cada imagem avaliada, os examinadores julgavam se estas eram aceitáveis ou não do ponto de vista clínico e científico e analisavam quatro variáveis: (a) brilho e contraste; (b) definição e nitidez; (c) fidelidade e reprodução de cores e (d) nota geral, aferindo uma nota de zero a cinco para cada quesito. Encontrou-se um alto grau de aceitabilidade de 82,9% das imagens sem diferença estatisticamente significante entre elas. Foi identificado que o grupo de imagens impressas em impressora amadora em todos os quesitos posicionou-se no grupo com valores inferiores, enquanto o grupo de imagens visualizadas na tela de computador apresentou resultados superiores na maioria dos quesitos (p < 0,05). Concluiu-se que os métodos de visualização de imagens digitais pesquisados apresentam-se dentro de padrões plenamente aplicáveis para serem utilizados em Odontologia enquanto o método da impressora amadora obteve o pior desempenho.
UNITERMOS: tecnologia odontológica; documentação; registros odontológicos.
SUMMARY
Since the use of digital images in Dentistry discloses a lot of advantages, this paper intended to evaluate four methods of image visualization in Dentistry. Four 35 mm slides with different quality were selected from the archive of the Minas Gerais Pontifical Catholic University Dental School. The slides were digitally converted by four methods and all images were prepared to be displayed by four methods: (1) digital print done in professional lab; (2) printed in high quality photography paper with an amateur printer; (3) computer screen and (4) multimedia projector. All images were evaluated by fifteen people divided into five groups. For each image an evaluation was done to establish if they were clinically and scientifically acceptable and four parameters were also analyzed: (a) brightness and contrast; (b) sharpness; (c) color reproduction and (d) general grade, rating all of them a score ranging from zero to five. Results showed high percentage of acceptable images (82,9%) when all methods were evaluated and lower scores in all parameters for images printed in an amateur printer and higher scores in some parameters for the images displayed on a computer screen (p < 0,05). The results of this study indicate that the quality of images displayed in the methods studied are within the standards required for their application to clinical dentistry and the amateur printer presented lower scores among the methods studied.
UNITERMS: dental technology; documentation; dental records.
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