{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,29]],"date-time":"2026-08-29T14:57:40Z","timestamp":1788015460191,"version":"build-2784847793"},"reference-count":23,"publisher":"Wiley","issue":"1","license":[{"start":{"date-parts":[[2019,10,2]],"date-time":"2019-10-02T00:00:00Z","timestamp":1569974400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Orthod Craniofacial Res"],"published-print":{"date-parts":[[2020,2]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Objective<\/jats:title><jats:p>The aim of this study was to assess the stability of Natural Head Position (NHP) over time using the 3dMDface System.<\/jats:p><\/jats:sec><jats:sec><jats:title>Setting and sample population<\/jats:title><jats:p>This was an experimental study. Three\u2010dimensional facial images of 40 students were captured on two different occasions, with an interval of at least two weeks.<\/jats:p><\/jats:sec><jats:sec><jats:title>Materials and Methods<\/jats:title><jats:p>The images were taken using a stereophotogrammetric device (3dMD). The mirror positioned NHP was obtained in a standing position and then replicated in a sitting position for capturing. The self\u2010balanced NHP was taken in a sitting position. Rapidform 3D software was used for position angle calculations. The angle changes between the positions were calculated for rotations around the x\u2010, y\u2010 and z\u2010axes.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>The differences between NHP in the self\u2010balanced and mirror positions recorded on the first and second occasions were 2.43 and 1.75 degrees, respectively, around the x\u2010axis. The average changes in NHP around the x\u2010axis between the self\u2010balanced and mirror balanced positions exceeded 3 degrees at the two\u2010week interval. The differences were smaller for the rotations around the y\u2010 and z\u2010axes. Some subjects consistently tended to hold their heads in a more extended position when self\u2010balanced, while others did this when mirror balanced. There was no difference in the reproducibility of NHP between men and women.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>The reproducibility of NHP for consecutive stereophotogrammetric captures is generally acceptable. 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