This patient had bilateral posterior cross bite, the upper teeth by biting into the lower both sides due to the presence of a narrow jaw by skeletal compression.

To correct it is necessary to place a jaw breaker that the patient must wear for about 6-8 months time for bone formation.

Once you completed the replacement tooth begin the second phase of orthodontic treatment that consisted of fixed appliances to correct the crowding and finish seating the occlusion. In 18 months by self-ligating brackets, you can see the results in the image below.