In most people, the sphenoid and occipital bones are moving posteriorly. So the maxilla and mandible continue to recede over time.

The position to normalize the movement of the temporal bone requires a large amount of movement of the lower jaw forward. If you do a treatment that retracts the maxillary anterior teeth without understanding the position of the lower jaw, it will move backwards at a faster speed. Since the posterior part of the maxilla is not growing and the occlusal plane is being steeped, the occlusal force is not transmitted to the first molar and the force is applied further backward, acting as the main cause of absorbing the condyle.

When the lower jaw accurately matches the left and right positions and heights, the sphenoid and occipital bones move normally, the maxilla and mandible are no longer retracted, and all skull bones show normal flexion and extension. The maxilla and lower jaw move forward rather than retract posteriorly when the sphenoid bone and the occipital bone move normally without mcb splint. At this time, if a pulling force is applied with The Crane (Face mask), the upper jaw moves forward and anterior PITCH, and the lower jaw moves forward as the position of the temporal bone changes.

Then all the muscles of the whole body will move upwards instead of downwards.