RESUMEN
El hipotiroidismo es el más común de los trastornos de la tiroides, puede ser congénito si la glándula tiroides no se desarrolla correctamente (hipotiroidismo congénito). La predominancia femenina es una característica. Entre las características odontológicas del hipotiroidismo se observan labios gruesos, lengua de gran tamaño, que debido a su posición suele producir mordida abierta anterior y dientes anteriores en abanico, destaca que la dentición temporal y permanente presentan un retardo eruptivo característico y, aunque los dientes son de tamaño normal, suelen estar apiñados por el tamaño pequeño de los maxilares. Se presentan dos casos clínicos de pacientes de sexo femenino que acuden a la clínica de Especialidad en Odontopediatría de la Universidad Autónoma del Estado de México con diagnóstico de hipotiroidismo congénito.
Hypothyroidism is one of the most common thyroid disorders. Hypothyroidism can be congenital in cases when the thyroid gland does not develop normally. Female predominance is a characteristic of congenital hypothyroidism. Dental characteristics of hypothyroidism are thick lips, a large-sized tongue which, due to its position, can elicit anterior open bite as well as fanned-out anterior teeth. In these cases, delayed eruption of primary and permanent dentitions can be observed, and teeth, even though normal-sized, are crowded due to the small-sized jaws. This study presents clinical cases of female patients diagnosed with congenital hypothyroidism who sought treatment at the Dental Pediatrics Unit of the Autonomous University of the State of Mexico.
RESUMEN
BACKGROUND: An increase in the acid resistance of dental enamel, as well as morphological and structural changes produced by Er:YAG laser irradiation, has been reported. PURPOSE: To evaluate the chemical changes associated with acid resistance of enamel treated with Er:YAG laser. Methods. Forty-eight enamel samples were divided into 4 groups (n = 12). Group I (control); Groups II, III, and IV were irradiated with Er:YAG at 100 mJ (12.7 J/cm(2)), 200 mJ (25.5 J/cm(2)), and 300 mJ (38.2 J/cm(2)), respectively. RESULTS: There were significant differences in composition of irradiated groups (with the exception of chlorine) and in the amount of calcium released. CONCLUSIONS: Chemical changes associated with an increase in acid resistance of enamel treated with Er:YAG laser showed a clear postirradiation pattern characterized by a decrease in C at.% and an increase in O, P, and Ca at.% and no changes in Cl at.%. An increased Ca/P ratio after Er:YAG laser irradiation was associated with the use of higher laser energy densities. Chemical changes produced by acid dissolution showed a similar trend among experimental groups. Stable or increased Ca/P ratio after acid dissolution was observed in the irradiated groups, with reduction of Ca released into the acid solution.