The difference between registered natural head position and estimated natural head position in three dimensions

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Abstract

This study determined the intra-rater repeatability and inter-rater reproducibility of re-orientating three-dimensional (3D) facial images into estimated natural head position. Three-dimensional facial images of 15 pre-surgical Class III orthognathic patients were obtained and automatically reoriented into natural head position (RNHP) using a 3D stereophotogrammetry system and in-house software. 6 clinicians were asked to estimate the natural head position of these patients (ENHP); they re-estimated 5 randomly selected 3D images after a 2-week interval. The differences in yaw, roll, pitch and chin position between RNHP and ENHP were measured. For intra-rater repeatability the intra-class coefficient (ICC) values ranged from 0.55 to 0.74 representing moderate reliability for roll, yaw, pitch and chin position, whilst for inter-rater reproducibility ICC values from 0.39 to 0.58 indicated poor to moderate reliability. Median differences between ENHP and RNHP was small for roll and yaw but larger for pitch. There was a tendency for the clinicians to estimate NHP with the chin tipped more posteriorly (6.3±5.2mm) compared to RNHP; reducing the severity of the skeletal deformity in the anterior-posterior direction. 
Original languageEnglish
JournalInternational Journal of Oral and Maxillofacial Surgery
Early online date17 Aug 2017
DOIs
Publication statusE-pub ahead of print - 17 Aug 2017

Keywords

  • Class III
  • orthognathic surgery
  • Estimated natural head position
  • registered natural head position
  • natural head position

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