JCO Journal of Clinical Orthodontics
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CASE REPORT Orthognathic Surgical Planning Using Nasion True Vertical and True Horizontal Lines

VOLUME 46 : NUMBER 07 : PAGES (407-415) 2012

JANGHOON AHN, DDS, MSD, PHD

JAMES MAH, DDS, MSC, DMSc

JAEHYUK KIM, DDS, MSD

YOUNGJU PARK, DDS, MSD, PHD

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Reproducibility and reliability are among the most important aspects of orthognathic surgical planning. Although most orthodontists and oral surgeons use Frankfort horizontal and sella-nasion as their major reference lines, these landmarks are associated with errors in accuracy and inter-examiner reliability. In addition, they do not realistically portray facial features.

Many researchers have suggested natural head position (NHP...

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