TY - JOUR
T1 - Stability of simultaneous maxillary and mandibular osteotomy for treatment of class III malocclusion
T2 - An analysis of three-dimensional cephalograms
AU - Kwon, Tae Geon
AU - Mori, Yoshihide
AU - Minami, Katsuhiro
AU - Lee, Sang Han
AU - Sakuda, Masayoshi
PY - 2000
Y1 - 2000
N2 - Purpose. The current investigation was undertaken to study the three-dimensional (3-D) stability of simultaneous maxillary advancement and mandibular setback using rigid fixation. The study also aimed to analyse the factors involved in postsurgical relapse by evaluation of changes in various parameters. Patients. Twenty-five cases were evaluated of simultaneous Le Fort I maxillary advancement and mandibular setback using rigid fixation. Methods. Preoperative, immediate and 6-month postoperative skeletal and dental changes were analysed using 3-D cephalograms obtained from biplanar stereoradiography. Maxillary fixation screws were used as landmarks to evaluate postoperative stability. Results. The mean maxillary advancement was 3.7 mm. Relapse in the sagittal, vertical, and transverse planes was not detectable in the maxilla (p> 0.05). However, for an average mandibular setback of 5.7 mm, mean mandibular relapse was 1.1 mm or 19.3% anteriorly (p< 0.05). Surgical or postsurgical skeletal changes in the maxilla had no detectable influence on mandibular relapse (p> 0.05). Vertical alterations of the facial skeleton achieved surgically predicted the mandibular relapse (R2= 0.27, p< 0.05). Conclusion. Maxillary advancement and vertical changes of ± 2 mm did not influence the postoperative stability of the mandible. Relapse of the mandible seems to be influenced mainly by the amount and direction of the surgical alteration of mandibular position.
AB - Purpose. The current investigation was undertaken to study the three-dimensional (3-D) stability of simultaneous maxillary advancement and mandibular setback using rigid fixation. The study also aimed to analyse the factors involved in postsurgical relapse by evaluation of changes in various parameters. Patients. Twenty-five cases were evaluated of simultaneous Le Fort I maxillary advancement and mandibular setback using rigid fixation. Methods. Preoperative, immediate and 6-month postoperative skeletal and dental changes were analysed using 3-D cephalograms obtained from biplanar stereoradiography. Maxillary fixation screws were used as landmarks to evaluate postoperative stability. Results. The mean maxillary advancement was 3.7 mm. Relapse in the sagittal, vertical, and transverse planes was not detectable in the maxilla (p> 0.05). However, for an average mandibular setback of 5.7 mm, mean mandibular relapse was 1.1 mm or 19.3% anteriorly (p< 0.05). Surgical or postsurgical skeletal changes in the maxilla had no detectable influence on mandibular relapse (p> 0.05). Vertical alterations of the facial skeleton achieved surgically predicted the mandibular relapse (R2= 0.27, p< 0.05). Conclusion. Maxillary advancement and vertical changes of ± 2 mm did not influence the postoperative stability of the mandible. Relapse of the mandible seems to be influenced mainly by the amount and direction of the surgical alteration of mandibular position.
UR - http://www.scopus.com/inward/record.url?scp=0034514554&partnerID=8YFLogxK
U2 - 10.1054/jcms.2000.0158
DO - 10.1054/jcms.2000.0158
M3 - Article
C2 - 11467390
AN - SCOPUS:0034514554
SN - 1010-5182
VL - 28
SP - 272
EP - 277
JO - Journal of Cranio-Maxillofacial Surgery
JF - Journal of Cranio-Maxillofacial Surgery
IS - 5
ER -