The Relevance Analysis Of Hyoid Bone Position To The Dental And Maxillofacial Complex In Three-Dimensional Orientation In Adult Women

Objective:1. Initial screening the relationship between the hyoid position and the dental and maxillofacial complex.2. To find out the better sensitive indicators) in the dental and maxillofacial complex.Methods:A total subjects consisted of 53 patients (average age 22.7 years, women) who visited the department of orthodontics, Shan dong University Dental Hospital, Ji Nan, China. The cephalometric and CBCT scans of 53 patients were taken under the NHP (natural head posture) by the same researcher. According to the data of cephalometric and CBCT variables which were digitized in the Dolphin imaging (Dolphin Imaging, version 11.0, USA), using Pearson and Spearman correlation analysis for an initial screening and multivariate linear regression analysis to find the better sensitive index(es) in the dental and maxillofacial complex.Result:1. By Pearson and Spearman correlation analysis, it showed that the horizontal indicators of the teeth (U6CW/U6FW) had a negative correlation with the hyoid bone position (H-MP); And the vertical index of the Jaw (FMA) and the length of the tongue (TT-Eb) were positively correlated with the hyoid bone position (H-MP).2. To further discuss in groups, using multivariate linear regression analysis to find out that the length of the tongue (TT-Eb) and the horizontal indicators of the teeth (U6FW) were more sensitive to the the hyoid position.3. Do the more sensitive indicators (TT-Eb/U6FW) with others by using Pearson and Spearman correlation analysis, it showed that the length of the tongue (TT-Eb) had a negative correlation with the sagittal index of the Jaw (APDI); and the horizontal indicators of the teeth (U6FW) were positively correlated with the horizontal indexes of the Jaw (Mx-Mx/PAW).Conclusion:1.Teeth:The wider width of the maxillary first molars, the higher position of the hyoid bone. And it was the better sensitive factor affecting the position of the hyoid bone.2.Maxilla:Mandible vertical index described more accurately the hyoid position. When a growth pattern was vertical,the hyoid position would be lower; After dividing into groups with APDI, a patient with skeletal Class â…¡ had a lower position of the hyoid bone.3.Tongue:Longer length of the tongue and lower position of the hyoid bone.