RESUMO
Aim: To evaluate the reliability of the automatic cephalometric analysis in relation to the semi-automatic method. Methods: Fifty lateral cephalometric radiographs were selected and two dental surgeons performed the Steiner and Tweed analyses independently using the semi-automatic method on the Radiocef Studio 2® software suite (Radiomemory, Belo Horizonte, MG, Brazil), and the automatic method on the Kodak Dental Imaging Software (Carestream Health, Rochester, NY, USA). After thirty days, 30% of the sample was re-evaluated to assess intra-observer agreement. Ten angular and linear measurements of both analyses were selected, averaged for both observers and compared using Student's t-test with a significance level of 5% (α=0.05). Intra and inter-observer agreement were assessed through Intraclass Correlation Coefficient. Results: Intra-observer reproducibility was excellent for all measurements and inter-observer reproducibility was excellent for most of them. Significant differences (p<0.05) were found between automatic and semi-automatic methods for all measurements. Most of the measurements were significantly higher (p<0.05) with the automatic method. Conclusion: Semi-automatic cephalometric analysis can not be replaced with a completely automatic method
Assuntos
Software , Cefalometria , BenchmarkingRESUMO
PURPOSE: To assess the applicability of the Tanaka-Johnston analysis in Brazilian subjects. METHODS: A total of 650 plaster casts of dental arches were examined, and 95 were selected to comprise the study sample. The largest distance between the contact points of mandibular and maxillary incisors as well as mandibular canines and premolars on the right side were measured with a calliper held parallel to occlusal plane and perpendicular to the long axis of the tooth. A prediction of the length of canines, and first and second premolars in both arches was made by using the Tanaka-Johnston analysis. Predicted and actual dental sizes were compared in relation to the gender and ethnic group of the sample subjects. RESULTS: The Tanaka-Johnston analysis overestimated the sum of mesiodistal widths of maxillary and mandibular canines and premolars only in the white female group. The difference between the Tanaka-Johnston prediction and the actual measurement was significant. For the other groups studied no statistical difference was observed. CONCLUSION: The Tanaka-Johnston analysis provided an acceptable prediction of the sum of mesiodistal widths of maxillary and mandibular canines and premolars in black and white Brazilian men, but not in white Brazilian women.
OBJETIVO: Avaliar a aplicabilidade da análise de Tanaka e Johnston em indivíduos brasileiros de cor de pele branca e de cor de pele negra. METODOLOGIA: Um total de 650 modelos de gesso de arcadas dentárias foram examinados e 95 foram selecionados para compor a amostra. Mediu-se a maior distância entre os pontos de contato dos incisivos inferiores e caninos e pré-molares, superiores e inferiores do lado direito, com o paquímetro paralelo ao plano oclusal e perpendicular ao longo eixo do dente. A predição do comprimento dos caninos, primeiros e segundos pré-molares em ambos os arcos foi feita através da análise de Tanaka e Johnston. Comparou-se a predição e o valor real do tamanho dos dentes em relação ao gênero e à cor da pele dos sujeitos da amostra. RESULTADOS: A análise de Tanaka e Johnston superestimou o somatório dos diâmetros mésio-distais dos caninos e pré-molares apenas no grupo de indivíduos de cor de pele branca do gênero feminino. Para os outros grupos não foram observadas diferenças estatisticamente significantes. CONCLUSÃO: A análise de Tanaka e Johnston permite uma predição aceitável do somatório dos diâmetros mésio-distais dos caninos e pré-molares dos indivíduos brasileiros de cor de pele negra e de cor de pele branca do gênero masculino. Com relação aos indivíduos de cor de pele branca do gênero feminino, os valores foram superestimados.