What two anatomical factors influence soft tissue movement after LeFort I osteotomies?

The correct answer highlights the importance of the anterior nasal spine (ANS) and the upper incisors in influencing soft tissue movement following a LeFort I osteotomy. Understanding their roles is crucial in surgical planning and anticipated outcomes in maxillofacial surgery.

The anterior nasal spine serves as a key landmark for the maxilla and provides a point of stability for soft tissue attachment. After a LeFort I osteotomy, which involves horizontal cutting and repositioning of the maxilla, the movement of the maxilla can impact the overlying soft tissues. The relationship between the ANS and the soft tissue of the upper lip indicates that when the maxilla is repositioned, movements at the ANS will directly affect the position of the lip and the surrounding soft tissue contour.

Additionally, the upper incisors play a critical role in facial aesthetics and function. Their position is directly influenced by the changes brought about by the osteotomy, thereby affecting the overall contour and appearance of the oral and perioral soft tissues. The arrangement of the upper incisors affects the lip support and the projection of the maxilla in relation to the face, which can drastically alter a patient’s smile and overall facial structure.

Therefore, recognizing how both the ANS and the positioning of upper