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[2-1]_(1~6) The Reproducibility of Natural Head Position between Before and After Orthognathic Surge

The Reproducibility of Natural Head Position between Before and After Orthognathic Surgery


Hee-Wook Sohn1 , In-Young Park2 , Young-Ju Park3 , Jang-Hoon Ahn4


1 Gai Dental Clinic, Private Practice, Seoul,

2 Department of Orthodontics, Hallym Sacred Heart Hospital, Hallym University, Pyeongchon,

3 Department of Oral-Maxillofacial Surgery, Kangnam Sacred Heart Hospital, Hallym University, Seoul,

4 Department of Orthodontics, Kangnam Sacred Heart Hospital, Hallym University, Seoul, Korea


Purpose: The aim of this study was to evaluate the reproducibility of the head posture between before and after surgery in one and two jaw surgical cases.


Methods: The subjects were 33 adult patients who received orthognathic surgery. All lateral cephalograms were taken in natural head position and measured at pre-surgical (T1), immediate after surgery (T2), and 6 months after surgery (T3). Craniovertical angle (SN/NTVL), craniocervical angle (SN/OPT, SN/CVT), cervical inclination angle (OPT/ THL, CVT/THL), and cervical lordosis angle (OPT/CVT) were analyzed.


Results: In one jaw cases, T1 to T3 and T2to T3 comparison showed no statistically significant differences except T1 to T2 comparison (SN/OPT angle) according to paired t-test (p<0.05). In two jaw surgical cases, there were no statistically significant differences only in T1 to T3 comparison according to paired t-test (p<0.05). All parameters of one jaw and two jaw surgical cases showed significant correlation coefficients in T1 to T3 comparison according to Pearson correlation coefficient (p<0.05).


Conclusion: The head posture based on NHP did not change significantly 6 months after orthognathic surgery. Therefore, NHP can be a reliable head position for diagnosis and treatment planning of orthognathic surgical patients irrespective of surgical type.


Key words: NHP, Reproducibility, Orthognathic surgery


Korean J Lingual Orthod 2013;2(1):1-6



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