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Purpose: The purpose of this study is to investigate the frontal sinus morphology in individuals with different sagittal skeletal relationships using postero-anterior sefalometric radiographs. Instrument and Method: 75 individuals are divided into 3 groups according to the sagittal skeletal relationship of the cranes (class I individuals; average age: 15,14±1,40 years, class II individuals; average age: 15,21±1,77 years, class III individuals; average age: 15,16±1,57 years). The maximum height and width of the right and left frontal sinus, the maxile width, the nasal width, the cranial width and the antegonial width parameters are measured on the 75 postero-anterior sefalometric radiograph. The data was analyzed using independent t, Mann Whitney U, one-way variance analysis and Kruskal-Wallis tests. The findings: The right frontal sinus height, the left frontal sinus height and width have shown statistically significant differences between the groups (P<0.05). Furthermore, the right frontal sinus width in class III individuals was found larger in men than in women, and this difference is statistically meaningful (P<0.05). The result: The frontal sinus size parameters can differ in individuals with different sagittal skeletal scalp relationships, which can bring a different perspective to judicial dentistry. Keywords: Frontal sinus, skeletal maloclusion, postero-anterior sefalometric radiograph EVALUATION OF FRONTAL SINUS DIMENSION IN DIFFERENT SAGITTAL SKELETAL RELATIONSHIP OF PEDIATRIC ORTHODONTIC SUBJECTS ABSTRACT Aim: The aim of this present study was to investigate frontal sinus morphology in different sagittal skeletal relationship subjects by using postero-anterior cephalometric radiographs. Materials and Methods: The study sample consisted of 75 subjects divided into three according to their jaw sagittal skeletal relationship groups (Class I subjects; average age: 15.14±1.40 years, Class II subjects; average age: 15.21±1.77 years, Class III subjects; average age: 15.16±1.57 years). The right and left maximum height and width of the frontal sinus, maxillary width, nasal width, cranial width, antegonial width parameters were measured in 75 postero-anterior cephalometric radiographs. The data were analyzed using independent t, Mann Whitney U, one-way analysis of variance and Kruskal-Wallis tests. Results: Right frontal sinus height, left frontal sinus height and width show statistically significant differences among groups (P<0.05).  Moreover, right frontal sinus width was larger in males than females in Class III subjects and this difference was statistically (P<0.05). Conclusion: The frontal sinus dimension parameters may bring a different perspective to forensic dentistry because they may differ in individuals with different sagittal skeletal jaw relationship. Keywords: frontal sinus, skeletal malocclusion

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