espanolEs conocido que al tomar los quarks up y down sin masa la Cromodinamica Cuantica tiene una simetria quiral exacta, pero dado que dichos quarks tienen masas peque.nas y diferentes esta simetria no es exacta, por lo tanto debe estar rota. Aqui estudiamos el Modelo ¥o Lineal en el limite de gran N, siendo N el numero de piones, con un termino que rompe la simetria quiral explicitamente, ademas analizamos la evolucion del potencial efectivo con la temperatura y el numero de campos, encontrando temperaturas criticas Tc para los casos en que la simetria quiral es explicita en el Lagrangiano y para cuando esta rota explicitamente. Observamos que la simetria quiral puede ser restaurada por efectos del numero de campos N, dependiendo del esquema de ruptura. EnglishIt is well known that up and down quarks when considered as massless an exact chiral symmetry leads QCD, however, as those masses are small and differ for both quarks this symmetry is not exact and must be broken. We study the Lineal o Model in the large N limit, where N is the number of pions, by considering a lagrangian term which explicitly breaks the chiral symmetry. We also analyze the evolution of the effective potential while temperature and the number of fields change, and find critical temperatures Tc for the cases in which the Lagrangian is symmetric and when the symmetry is explicitly broken. We observe that quiral symmetry can be restored increasing the number of fields N but depending on the symmetry breaking scheme.