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RESUMENLa displasia ectodérmica (DE) es un trastorno genético que se caracteriza por alteraciones que afectan las estructuras derivadas del ectodermo; usualmente el síndrome presenta hipohidrosis, hipotricosis e hipodoncia, siendo esta última una manifestación importante para los profesionales en odontología. Se presenta el caso de un paciente que acude a consulta odontológica y en el que se identifi caron defectos del ectodermo como cabello fi no, escaso y alteraciones en la calidad del esmalte dental que sugieren la presencia de DE; además, se realizó una comparación con los tipos de DE más comunes. PALABRAS CLAVE: Displasia ectodérmica, hipohidrosis, hipotricosis. SUMMARYEctodermal Dysplasia (ED) is a genetic disorder characterized by alterations affecting the derived ectoderm structures; the syndrome usually presents hypohidrosis, hypotrichosis and hypodontia, the latter being a fairly signifi cant event for dentists. This case report aimed to show a patient who went to a dentistry appointment and where ectodermal defects such as poor thin hair and enamel quality alterations suggested an ED case; also a comparison of ED types was done.

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Objective: To determine the relationship between chronological age and dental age using Demirjian's method and Baccetti's method of cervical vertebral maturation in radiographs of children and adolescents aged 5 to 16 years in the city of Bucaramanga, Colombia. Methods: An analytical observational cross-sectional study was performed in 1385 cephalometric and panoramic radiographs of 775 females and 610 males. Sex, dental age according to the Demirjian's method, chronological age and degree of maturation of the cervical vertebrae according to Baccetti's method were analyzed. The univariate analysis included the calculation of measures of central tendency for quantitative variables, and frequencies and proportions for qualitative variables. Spearman correlation coefficients were calculated in the bivariate analysis. In the multivariate analysis a multiple linear regression was performed. A value of p<0.05 was considered statistically significant. Results: The mean chronological age was 10.8±3.3 years [Median: 11; 95%