" عَلاقَةُ زاوِيةِ نُورْدِفَالْ مَعَ مُورْفُولُوجِيَا النُّمُوِّ الدَّوَرَانِيِّ الوَجْهِي في مَرْحَلَةِ الإِطْبَاقِ الدَّائِمِ لَدَى الإِنَاثِ: دِرَاسَةٌ سَيْفَالُومِتْرِيَّةٌ."

Abstract

The structure of the females' faces is characterized by various elements that enhance its beauty, with the mandibular symphysis holding a significant position among them. Several studies acknowledge the relationship between the morphology of the mandibular symphysis and different facial types of rotational growth. Nevertheless, the Norderval angle (an angle termed the N-angle, used to measure the inclination of the symphysis and indicate the prominence of the bony chin relative to the mandibular plane) was not included in these analyses, despite being considered in several growth studies.

 Aim The aim of this study is to evaluate the correlation between the Norderval angle and facial rotational growth morphology according to Jarabak cephalometric analysis in females during the permanent occlusion phase.

Materials and methods: Lateral cephalometric radiographs of 53 female pre-orthodontic patients, aged 15 to 21 years, were included and digitally studied. Pearson’s correlation coefficient was calculated to investigate the strength of the linear relationship between the "Norderval angle" and each of the other dependent cephalometric variables that characterize facial rotational growth morphology.

 Results:The calculated correlations highlight the varying degrees of association between different cephalometric variables that characterize facial rotational growth morphology and the "Norderval angle" in the context of the study. The Mandibular Plane Angle shows the highest positive correlation with the "Norderval angle," while the " Facial Height Ratio " exhibits the highest negative correlation with the "Norderval angle.".

 Conclusions the Norderval angle can be utilized as a cephalometric indicator of facial rotational growth morphology in females, albeit cautiously.