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A study on the perimandibular tissues before and after orthodontic treatment with orthognathic surgery in mandandibular prognathic patients

Korean Journal of Orthodontics 2000³â 30±Ç 2È£ p.261 ~ 272
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Abstract

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#ÃÊ·Ï#
-Abstract-
Severe skeletal anteroposterior and vertical discrepancy is difficult to obtain
satisfactory result by only orthodontic treatment, and much anteroposterior movement
and treatment stability require orthodontic treatment with orthognathic surgery. The
treatment goal of mandibular prognathic patients is to promote the function of
stomatognathic system including mastication and phonetics, to improve the esthetics of
facial profile and to maintain stability. Positional changes of hyoid bone, pharynx and
tongue were seen with mandibular movement after orthognathic surgery. This study
was performed to observe the changes of perimandibular tissues of orthodontic patients
with skeletal mandibular prognathism who treated with orthodontic treatment, and the
changes of hyoid bone, pharyx and tongue by relapse or recurrance after before and
after orthognathic surgery and retention.
The 22 patients who had mandibular prognathism were selected. They treated with
orthodontic treatment with sagittal split ramus osteotomy as orthognathic surgery. And
lateral cephalomeric radiography were taken 3 times: pre-surgery (T1), immediate
post-surgery (T2) and 2 years after retention (T3).
The results were as follows :
1. The hyoid bone returned back after clockwise rotation to maxilla and occlusal plane
during retention (p<0.01).
2. The hyoid bone moved posterior-inferiorly by mandibular surgery and returned back
anterior-superior after retention (p<0.01).
3. The changes of pharyngeal depth showed a little decrease at upper area in
post-surgery, but it was not a significant difference generally through before, after and
retention.
4. In relating to tongue base, the angle of tongue base was decreased and the dorsal
area of tongue base moved to inferior-posterior direction and to superior direction again
after retention (p<0.01).
5. Related to the thickness of upper and lower lip, the thickness of upper lip decreased
after surgery, and the soft tissues below lower lip increased after surgery and decreased
after retention.

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ÇÏ¾Ç Àüµ¹Áõ; ¾Ç±³Á¤ ¼ö¼ú; ¼³°ñ; ¿¬Á¶Á÷; Mandible prognathism; Orthognathic surgery; Hyoid bone; Soft tissue;

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KoreaMed