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The Chinese Journal of Dental Research

Year 2004
Volume 7 , Issue 3

Pages: 5 - 21

A Longitudinal Study of the Stability and Consistency of Natural Head Position in Females Aged Six to 18 with Different Facial Skeletal Patterns

Xinping Lin/Vivat Tangugsorn/Arild Stenvik/Lisen Espeland

Objective: To investigate the stability and consistency of natural head position (NHP) among the long facial type (LFT), short facial type (SFT) and average facial type (AFT) over time. Methods: The material consisted of lateral cephalograms of 30 female subjects, taken at 6, 9, 12, 15, and 18 years, in their natural head positions. These subjects were selected randomly and divided into three groups, based on the MP-SN angle at approximately 15 years. Serial cephalometric X-rays were traced by the superimposition method based on the “best fit” of anterior cranial base structures. Result: 1. The craniovertical angles (NSL/VER) and craniocervical angles (NSL/CVT, NSL/OPT) in three facial types from 6 to 18 years are stable and consistent. 2. The cervical inclination angles (OPT/HOR, CVT/HOR) in three facial types from 6 to 18 year are stable and consistent, except for the 6- to 12-year interval for the CVT/HOR angle in LFT. 3. The cervical lordosis angle (CVT/OPT) is stable and consistent, except for the 6- to 9-year interval in SFT. 4. There were no significant differences in the change in NHP among three facial types. Conclusion: Irrespective of facial patterns over the age period of six to 18 years in females, NHP is stable over time.



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