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The aim of this study were to evaluate quantitatively the variations on the determination of 7 cephalometric landmarks and to analyze how these differences may influence the planning and outcome of the orthodontic treatment. Small steel balls were glued on specific sites of 14 dry skulls to represent the true anatomical landmarks. The skulls were radiographed with and without the steel balls, and the cephalometric values were submitted to statistical analysis. Results showed that the error in the localization of the landmarks was in average 57,5%. This high deviation, that reaches up to 4mm in certain cephalometric measurements, could lead to errors in treatment planning and compromise the result of any orthodontic treatment. Measurements of the Anterior Nasal Spine, Pogonion and Gonion showed the highest reproducibility, while point A showed the lowest (4,3mm). The evaluation of the mandibular length through the identification of Condyle also showed high discrepancies (2,8mm), which may alter the evaluations for orthodontic and/or surgical diagnosis and treatment. Key-words: Cephalometric radiograph – Cephalometric analysis – Landmark identification LISTA DE ILUSTRAÇÕES Figura 4.1 A figura demonstra o traçado cefalométrico com os pontos a serem utilizados na avaliação 28 Figura 4.2 Traçado com os pontos cefalométricos marcados sobre a radiografia do crânio29 Figura 4.3 Traçado com os pontos metálicos marcados sobre a radiografia do crânio30 Figura 4.4 Utilizamos o traçado, com sobreposição dos pontos cefalométricos e pontos metálicos, para mensuração das diferenças de localização dos pontos31 Figura 4.5 Fotografia do crânio adaptado ao cefalostato no aparelho Quint Sectograph32 Figura 4.6 Demonstração da marcação do ponto metálico na região do nasio 33 Figura 4.7 Demonstração da marcação do ponto metálico condílio na região do côndilo34 Figura 4.8 Aspecto da radiografia com os pontos cefalométricos identificados35 Figura 4.9 Aspecto da radiografia com os marcadores metálicos nos pontos cefalométricos 36 Figura 5.10 -Curva de avaliação do método40

"Estudo da padronização para a determinação de pontos cefalométricos utilizados na cefalometria radiológica"