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KMID : 1036320130350020082
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Maxillofacial Plastic and Reconstructive Surgery
2013 Volume.35 No. 2 p.82 ~ p.87
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Three Dimensional Study on the Postoperative Stability after Advancement of Maxilla Using Le Fort I Osteotomy
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Oh Chul-Jung
Hur Jung-Woo
Chung Kwang
Cho Min-Sung
Jung Seung-Gon
Park Hong-Ju
Oh Hee-Kyun
Ryu Sun-Youl
Kook Min-Suk
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Abstract
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Purpose: This study evaluated postoperative maxillary stabilities in patients with skeletal Class III malocclusion who were taken both maxillary advancement surgery and mandibular retrusive surgery, using Le Fort I osteotomy, through three-dimensional computed tomography.
Methods: We selected 14 patients who were taken postoperative three-dimensional computerized tomography at the time before surgery, immediately after surgery, six months after surgery among the patients undergone both maxillary advancement surgery using Le Fort I osteotomy and mandibular retrusive surgery using bilateral sagittal split ramus osteotomy. We measured and compared the vertical distance of A-point and posterior nasal spine (PNS), the horizontal distance of A-point and PNS in transverse plane and coronal plane of the three-dimensional reconstructed images, respectively.
Results: In transverse plane, the distance difference between immediately after surgery ($S_1$ 수식 이미지) and immediately before surgery ($S_0$ 수식 이미지) of A-point was $-0.04{\pm}1.80$ 수식 이미지 mm, $S_2$ 수식 이미지 and $S_0$ 수식 이미지 was $-0.15{\pm}1.69$ 수식 이미지 mm, and between $S_1$ 수식 이미지 and $S_2$ 수식 이미지 was $0.11{\pm}0.58$ 수식 이미지 mm. There were no significant differences between these data (P>0.05). In transverse plane, the distance between $S_1-S_0$ 수식 이미지 of PNS was $-3.87{\pm}2.37$ 수식 이미지 mm, $S_2-S_0$ 수식 이미지 of PNS was $-3.79{\pm}2.39$ 수식 이미지 mm, and $S_1-S_2$ 수식 이미지 of PNS was $-0.08{\pm}0.18$ 수식 이미지 mm. There were significant differences between these data (P<0.05). In coronal plane, the distance between $S_1-S_0$ 수식 이미지 of A-point was $3.99{\pm}0.86$ 수식 이미지 mm, $S_2-S_0$ 수식 이미지 was $3.57{\pm}1.09$ 수식 이미지 mm, and $S_1-S_2$ 수식 이미지 was $0.42{\pm}0.42$ 수식 이미지 mm. There were significant differences between these data (P<0.05). In coronal plane, the distance between $S_1-S_0$ 수식 이미지 of PNS was $3.82{\pm}0.96$ 수식 이미지 mm, $S_2-S_0$ 수식 이미지 was $3.43{\pm}0.91$ 수식 이미지 mm, and $S_1S_2$ 수식 이미지 was $0.39{\pm}0.49$ 수식 이미지 mm. There were significant differences between these data (P<0.05). In transverse plane, it was estimated that PNS has no statistical postoperative stability in the same direction. In coronal plane, it was estimated that both A-point and PNS had no statistical postoperative stability (P<0.05).
Conclusion: Clinically, the operation plan needs to take into account of the maxillary relapse.
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KEYWORD
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Le Fort I osteotomy, Three dimensional computed tomography, Maxillary relapse, Postoperative stability
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