The aim of this study was to investigate whether mixed dentition cases with different mandibular plane angles also had significant differences in their craniofacial morphology. The material of this study consisted of 30 skeletal Class I patients (18 females, 12 males) referred to Orthodontic Department of Suleyman Demirel University, Faculty of Dentistry. All patients were in mixed dentition period and they had no previous orthodontic treatment. The cases were divided into 2 groups according to mandibular plane angle (GoGnSN). Cephalometric measurements of the groups were statistically compared with Mann-Whitney U test. Pearson correlation test was applied to find out the correlation between mandibular plane angle and craniofacial morphology. It was determined that cases with low mandibular plane angles had bigger SNA, SNB and IMPA angles, face height ratios, ramus heights and effective maxillary lengths. Besides, they had smaller occlusal plane, Y axis and cranial base angles. Also significant correlations were found between aforementioned measurements and mandibular plane angle. The results of this study demonstrate that mixed dentition cases with different mandibular plane angles also have significant differences in their craniofacial morphology.

Keywords: Sefalometri, Cephalometrics, Correlation, Mandibular plane angle, Mixed dentition,