Some indexes have been used in the international scientific community in response to the need for information about the severity of malocclusion and the perceived need for orthodontic treatment. The ICON index and aesthetic component of IOTN help clinicians to determine the need of treatment according to different parameters. Material and methods: The ICON index and the aesthetic component of IOTN were used to assess pretreatment orthodontic patients in study models of the Universidad Autónoma

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... e Nayarit. The study universe was 986 models and the sample was 166 study models. The Microsoft Offi ce Excel 2007 program was used to tabulate the information and perform descriptive statistics; the Kappa test was performed between the two indexes. Results: The mean for ICON was 40.38 and for the aesthetic component of IOTN, 4.03 points. The result of kappa test between the two indexes was good (0.789), both coincide in 89.46% of the evaluations. Conclusions: Both indexes may be used to determine the need for orthodontic treatment. Comparación de los índices ICON y el componente estético del IOTN para determinar la necesidad de tratamiento ortodóncico Comparison between the ICON index and the esthetic component of the IOTN to determine the need for orthodontic treatment Este artículo puede ser consultado en versión completa en http://www.medigraphic.com/ortodoncia Palabras clave: ICON, IOTN, tratamiento ortodóncico.