“…Shigemi Goto et al (Shigemi Goto et al, 1996) and Rossi et al (Rossi et al, 1999), analyze the changes at level of the first finger, in the distal phalanx and in the proximal respectively, finding that the evaluations at level of the phalanges constitute a quick and useful clinical method, to evaluate the growth potential in patient of Orthodontics. Madhu et al (Madhu et al, 2003) and Ozer et al((Ozer et al, 2006) use the stages of maturation of the middle phalange of the third finger, visualized in an X-ray of 41x31mm., taken with a machine of dental X rays conventional, where they find out that the evaluation of the stages of maturation of the middle phalanx of the third finger, constitutes an alternative method that can be used to determine the bone maturation, of the children in growth. Previous to the realization of this investigation, was not reports that in Cuba the patient's growth potential was evaluated through the middle phalange of the third finger, that which motivated us to determine the stages of maturation of that phalange and to identify the concordance between these and the stages of skeletal maturation, whereas clause that of existing concordance among the same ones, we will have a simplified method, for the determination of the growth potential, without the necessity of using an X-ray of the hand and an additional X-rays machine.…”