Professor Yong-Deok KIM
Pusan National University
Orthodontic preparation for orthognathic surgery
plays an important role in determining the
direction/amount of skeletal movement and dental rearrangement for the
skeletal postoperative stability. During the preoperative
orthodontic treatment the securing spaces and the dental
rearrangement through the extraction of a certain teeth were performed for the
facial profile, dentition and the compensation of the skeletal change of
patient. Because the choice of extraction / non - extraction treatment
affects the orthodontic purposes, as well as the
option or procedure of the orthognathic surgery,
sometimes it results the positive effect on predictable surgery and also puts on difficulties. For example, non-extraction orthodontic
treatment would make the surgery difficult due to insufficient AP discrepancy
compared to the skeletal disharmony of the patient or extraction one might make
the up-righting of upper incisors which would limit the movement of maxilla or
prohibit the improvement of facial esthetics through the proper surgery
especially in Class III malocclusion patients. However, these limitations have
been significantly eliminated by recent studies and attempts of the various
3-dimentional skeletal movements including rotational or setback movement of
maxilla. Accordingly, the current trend is the high proportion of
non-extraction treatment and 2-jaw surgery compared to extraction and 1-jaw. The
purpose of the presentation is to introduce the maxillary posterior reposition
affecting the choice of the extraction/non-extraction orthodontic treatment and
to find out how it affects the orthognathic treatment plan which is made by
orthodontists and surgeons. In particular, I would like to share our
experiences for the exact setback Le Fort I osteotomy methodologically.
