En este estudio se realizo una evaluacion de la estabilidad clinica de los miniimplantes utilizados como anclaje oseo para la intrusion de molares superiores. Se emplearon treinta y cuatro mini implantes de acero inoxidable marca Leone ® de cuatro dimensiones (1,5 x 10 mm, 1,5x12 mm, 2 x 10 mm y 2 x 12 mm), en nueve pacientes y un total de dieciocho dientes por intruir. El procedimiento de insercion se hizo de acuerdo con las recomendaciones del fabricante. La estabilidad de los mini implantes se evaluo mensualmente midiendo su movilidad clinica por medio de un calibrador digital. Se encontro que todos los miniimplantes colocados fueron efectivos como anclaje oseo para realizar el movimiento intrusivo a pesar de la aparicion de movilidad en algunos de ellos, lo que indica que los mini implantes pueden tener cierto rango de movimiento sin perder su eficacia clinica. Se encontro que variables como la fuerza aplicada al miniimplante, la dimension (longitud y diametro) y el torque de insercion no tienen relacion con la estabilidad. A diferencia de esto se hallo que los mini implantes ubicados en la mucosa palatina fueron mas estables que los localizados en la zona vestibular. La encia queratinizada presenta mejores condiciones clinicas (menor inflamacion e hiperplasia) que la mucosa alveolar para la colocacion de los mini implantes que favorecen la estabilidad a traves del tiempo. En ningun molar se encontraron signos de reabsorcion radicular en la evaluacion radiografica. ABSTRACT . The aim of this study was to undertake a clinical stability evaluation of the mini implant used as bony anchorage for the intrusion of upper molars. Thirty four Leone ® stainless steel mini implants were used (four dimensions: 1.5 x 10 mm, 1.5 x 12 mm, 2 x 10 mm and 2 x 12 mm), in nine patients and a total of 18 teeth to be intruded. The insertion procedure was performed according to the manufacturer’s recommendations. The stability of the mini implants was evaluated monthly measuring its clinical mobility by means of a digital Boley gauge. It was found that all the mini implants placed were effective as bony anchorage to carry out the intrusive movement in spite of the appearance of mobility in some of them, which is an indication that mini implants can have certain range of movement without losing its clinical effectiveness. It was found that variables such as the force applied to the mini implant, the dimension (length and diameter) and the insertion torque are not related to stability. Conversely, it was found that mini implants located in the palatal mucosa were more stable than those located in the vestibular area. The keratinized gingiva presents better clinical conditions (less inflammation and hyperplasia) than the alveolar mucosa for the mini implant placement because it favors stability throughout time. No signs of root resorption in any of the molars were found in the radiographic evaluation. 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