The correlation between cranial base size, shape and head posture, and the position of maxillo-facial structures

Hong, Yong Seok; Yoon, Young Jooh; Kim, Kwang Won

Abstract

This study was done to evaluate the correlations berween the size, the form of the cranial base, head posture and the horizontal and vertical position of craniofacial structures. For this purpose, 100 cephalometric radiographs were taken from the sample composed of 51 male and 49 female, 12 measurement criteria and 37 reference points were established and digitized, then calculation was performed for the values of measurement variables and the horizontal and vertical position of reference points. The correlations between them were analyzed statistically and mean facial diagrams were constructed and compared with the selected groups which were composed of 10 Samples each as large and small group from the measurement value. The following results were obtained : 1. The angles n-s-ba and n-s-ar as variables for the form of cranial base correlated hight to the horizontal and vertical position of reference points in the cervical column with statistical significance(0.1% level). 2. The angles n-s-ba and n-s-ar as variables for the form of cranial base correlated to the horizontal position of the reference points in the facial stucture with statistical significance(1% level), but not to the vertical position of them(5% level). 3. The length n-s, s-ba, and n-ar as variables for the size of cranial base were correlated th the position of eranioracial structures in various ways, but in general, highly correlated to the horizontal and vertical position of midfacial structures around the teeth and alveolar area. 4. The angle NAL/CVT and NSL/OPT as postural variables for the inlination if cranial base and cervical column were correlated to the horizintal position of the craniofacial structures with statistical significance(1% level), but not to the vertical position of them(5% level). 5. The angle OPT/HOR and CVT/HOR as postural variables for the inclination of cranial base and ture horizontal line were not correlated to the horizintal and vertical position of the craniofacial structures with statistical significance(5% level). 6. The correlation between the measurement variables and horizontal and vertical positions of the reference poits in soft tissue were shown as similar to the related hard tissue points.