Comparison of Sella-Nasion to Frankfort-Horizontal plane angle between genders in different sagittal classes of malocclusion

Muzka Ijaz; Erum Amin; Nasira Adnan; Kiran Ijaz

Comparison of Sella-Nasion to Frankfort-Horizontal plane angle between genders in different sagittal classes of malocclusion

Authors

Muzka Ijaz BDS; Resident, Orthodontic department, Armed Forces Institute of Dentistry, Rawalpindi, Pakistan.
Erum Amin BDS, FCPS, CHPE; Assistant Professor, Department of Orthodontics, Armed Forces Institute of Dentistry, National University of Medical Sciences, Rawalpindi, Pakistan.
Nasira Adnan BDS; Resident, Orthodontic department, Armed Forces Institute of Dentistry, Rawalpindi, Pakistan.
Kiran Ijaz BDS; Resident, Orthodontic department, Khyber College of Dentistry, Peshawar, Pakistan.

Keywords:

Angleâ€™s classification, cranial base, dimorphism

Abstract

Introduction: The most important consideration while performing lateral cephalometric analysis is selection of a different reference planes hence the main aim of this cephalometric study was to compare the Sella-Nasion to Frankfort horizontal plane (SN-FH) angle between genders in three sagittal classes of malocclusion in patients reporting to a tertiary care set up.

Material and methods: Lateral cephalometric records based on cross sectional study, was conducted on 180 patients (90 males and 90 females). Of them 60 were from each class of malocclusion (class I, II, III) and in each class, there was equal distribution of genders with 30 females and 30 males. The angle between SN and FH plane, NFH- the closest distance from FH to N (nasion), SFH- the closest distance from FH to S (sella) and the difference between NFH and SFH (Î”) was measured. Student's â€œtâ€ test and ANOVA was used for comparison and the P value â‰¤0.05 was considered significant.

Results: The overall mean values were SN-FH angle 7.21Â±2.46 degrees, NFH, SFH 25.75Â±2.91 mm, and the NFH-SFH difference was 16.04Â±3.72 mm, and 7.48Â±3.37 mm respectively. In skeletal class I the age and NFH was not statistically significant between genders while SN-FH angle (P=0.03, 95% CI= -2.8, -.11), SFH (P=0.02, 95% CI= -4.3, -.46) and difference of SFH-NFH (P=0.01, 95% CI= -4.3, -.74) were statistically significant. While in skeletal class II and class III all parameters were not statistically significant.

Conclusions: There is statistically significant sexual dimorphism was found in SN-FH angle in skeletal class I but not in class II and III. Females have steeper SN-FH angle