The purpose of this retrospective study was to analyze, by age, the prevalence of traumatic injuries to primary and permanent incisors, and their distribution according to type in a group of boys from private schools in Monterrey, Mexico. The sample consisted of 1010 boys aged 3-13 years enrolled in 4 private schools in the city. Garcia-Godoy's classification for traumatic injuries was used. The prevalence of injuries was 28.4%; 72.2% of the 4-year-olds examined presented signs of traumatic dental injuries. Thirty-seven percent of the 11-year-olds examined had evidence of traumatic dental injuries. The most common type of injury in the primary and permanent dentitions was enamel fracture (58.5% and 69.6%, respectively).

1 Differences in vascular responses to phenylephrine, acetylcholine (ACh) and potassium chloride (KCl) were studied in rabbit aorta from female and male rabbits, in the absence and presence of an inhibitor of nitric oxide (NO) production, N0-nitro-L-arginine methyl ester (L-NAME, 100 yM).2 Phenylephrine and KCl-induced contractions, were significantly reduced in amplitude (P<0.01) in the rings from female rabbits compared to those from male rabbits. 3 ACh-induced relaxation was greater (P<0.01) in aortic rings from females than from males. 4 Incubation of the rings with L-NAME abolished the phenylephrine-induced contraction differences between rings from male and female rabbits. 5 Ovariectomy eliminated the differences in vascular responses to phenylephrine, KCl and ACh of aortic rings from the female rabbits. 6 Both basal and ACh-stimulated release of nitrites from aortic rings was greater (P<0.01) in vascular tissue from female than male rabbits. 7 These results indicate that differences in vascular reactivity in aortic rings from male and female rabbits may be associated with a higher release of NO, resulting in an increased vasodilator response in the female rabbits.

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Transición demográfica Mortalidad Ávila Guadalajara Siglos xviii y xix r e s u m e n ¿Qué aconteció en la España interior durante la primera fase de la transición demográfica europea? ¿Hubo variaciones significativas en los niveles de mortalidad en el largo plazo? Este artículo trata de dar respuesta a dichos interrogantes. Las fuentes primordiales empleadas en el mismo han sido los libros de bautismos y de difuntos de muestras de localidades de las provincias de Ávila y Guadalajara. Las conclusiones más relevantes son: 1) la España interior no quedó completamente descolgada de la primera fase de la transición demográfica europea, ya que, desde mediados del siglo xviii, la mortalidad, aunque con importantes interrupciones y altibajos, tendió a declinar en dicho territorio; 2) la contribución de la mortalidad ordinaria a dicho retroceso fue bastante más importante que la de la extraordinaria; 3) la mortalidad infantil y juvenil mostró una fuerte resistencia a la baja, y 4) la mortalidad general se estancó o repuntó ligeramente entre 1860 y 1889.

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