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Effects of Vertical Movement of the Anterior Nasal Spine on the Maxillary Stability After LeFort I Osteotomy for Pitch Correction

Ohba, Seigo PhD*,†; Nakao, Noriko PhD; Nakatani, Yuya*; Yoshimura, Hitoshi PhD; Minamizato, Tokutaro PhD*; Kawasaki, Takako*; Yoshida, Noriaki PhD§; Sano, Kazuo PhD; Asahina, Izumi PhD*

doi: 10.1097/SCS.0000000000001968
Brief Clinical Studies
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Few reports have so far evaluated the maxillary stability after LeFort I osteotomy (L-1) for pitch correction. In the current study, the authors assessed the SN-PP (palatal plane) to evaluate the skeletal stability after osteotomy with clockwise or counter-clockwise rotation and investigated the effects of anterior nasal spine (ANS) and posterior nasal spine (PNS) movement on the stability of the SN-PP.

The SN-PP and the positions of ANS, PNS, and point A were measured on lateral cephalograms before surgery (T1), immediately after surgery (T2), and more than 1 year after surgery (T3).

All measured angle and points were stable in 4 cases of counter-clockwise rotation. In the 16 cases of clockwise rotation, T3-T2 of SN-PP, ANS, and point A was −2.05°, −2.56 mm, and −1.64 mm, when the SN-PP increased more than 4° after osteotomy. When the ANS moved downward more than 3 mm, the ANS and point A relapsed significantly by 2.75 and 2.31 mm, while the SN-PP relapsed 1.61° more than 1 year after surgery.

When the SN-PP increased by more than 4° or the ANS moved downward by more than 3 mm, the authors suggest shifting the PNS upward instead of moving the ANS downward.

*Department of Regenerative Oral Surgery, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki

Division of Dentistry and Oral Surgery, Department of Sensory and Locomotor Medicine, Faculty of Medical Sciences, University of Fukui, Fukui

Department of Special Care Dentistry, Nagasaki University Hospital of Medicine and Dentistry

§Department of Orthodontics and Dentofacial Orthopedics, Nagasaki University Graduate School of Biomedical. Sciences, Nagasaki, Japan.

Address correspondence and reprint requests to Seigo Ohba Department of Regenerative Oral Surgery, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan; E-mail: sohba@nagasaki-u.ac.jp

Received 14 February, 2015

Accepted 1 May, 2015

The authors report no conflicts of interest.

© 2015 by Mutaz B. Habal, MD.