Cephalometric Standard Proportional Template for Normal Adults Based on Natural Head Orientation

Abstract

Introduction: Cephalometric analysis based on estimated natural head position (NHO) could be used as reliable method as registered natural head position (NHP) without related technical problems. This study have been carried out in purpose of preparing a template that makes the use of extracranial reference possible. Material and methods: Cephalograms and photographs from 63 orthodontic patients’ files (33 males and 33 females) with proportionate profile and normal occlusion were analyzed. First, photographs adjusted into natural head position using estimated method then they were transmitted to cephalograms using angle between N-Line/TV and E-Line/TV. From landmark N on cephalograms, true vertical and true horizontal lines were drowned. Then hard, soft tissue and teeth landmarks, were identified according to coordinate system. After obtaining mean values, standard facial profile was drawn for male and female separately. After that, the graphic mean face became incorporated into transparent sheets to form template for men and women in 5 different size based on S-N distance. Spss 17 was used for statistical analysis. Difference less than 0.05 was considered significant. Results: The comparison between two gentle registering on landmark N and true vertical line showed that linear measurements on the hole, are larger in males than females. Also in the males, forehead and chin are more prominent and nasio-labial angle is less than females. Conclusion: use of proportional cephalometric template based on NHO could be a useful diagnostic tool that leads to accurate and fast analysis.

Introduction: Cephalometric analysis based on estimated natural head position (NHO) could be used as reliable method as registered natural head position (NHP) without related technical problems. This study have been carried out in purpose of preparing a template that makes the use of extracranial reference possible. Material and methods: Cephalograms and photographs from 63 orthodontic patients’ files (33 males and 33 females) with proportionate profile and normal occlusion were analyzed. First, photographs adjusted into natural head position using estimated method then they were transmitted to cephalograms using angle between N-Line/TV and E-Line/TV. From landmark N on cephalograms, true vertical and true horizontal lines were drowned. Then hard, soft tissue and teeth landmarks, were identified according to coordinate system. After obtaining mean values, standard facial profile was drawn for male and female separately. After that, the graphic mean face became incorporated into transparent sheets to form template for men and women in 5 different size based on S-N distance. Spss 17 was used for statistical analysis. Difference less than 0.05 was considered significant. Results: The comparison between two gentle registering on landmark N and true vertical line showed that linear measurements on the hole, are larger in males than females. Also in the males, forehead and chin are more prominent and nasio-labial angle is less than females. Conclusion: use of proportional cephalometric template based on NHO could be a useful diagnostic tool that leads to accurate and fast analysis.