Abstract
It is of interest to establish the cephalometric correlation of angular data between frankfort horizontal and the sella-nasion line in different sagittal skeletal bases. Beta angle was used to divide the sample based on their sagittal skeletal base relationship. The FH-SN angle was measured for each group. The data were tabulated into IBM SPSS software. Kolmogorov-Smirnov and Shapiro-Wilk test was done to test the normal distribution of the data. One-way ANOVA analysis was done to test the difference of the FH-SN angle among the groups. Independent samples t-Test was done to test for gender dimorphism. The mean FH-SN angle of the sample was 6.33°3.35°. The results of the One-Way ANOVA and independent samples t-Test were insignificant. Results show that is no statistically significant difference in FHSN angle between skeletal class I, II and III.The mean FH-SN angle of the sample was 6.33°3.35°. The distribution of the data was normal. The results of the One-Way ANOVA and Independent samples t-Test were insignificant. There was no statistically significant difference in FH-SN angle between skeletal class I, II and III.
Highlights
The variations in sagittal skeletal relationships have an impact on other skeletal structures
The value of the overall average FH-SN angle was close to the accepted norm of the 7° angle between the FH-SN planes
One-way ANOVA analysis revealed that there was no statistically significant difference between the FH-SN angles in different skeletal relationships (Table 1). This is concurrent with findings of Giri et al [9,10,11,12,13] wherein no statistically significant difference was appreciable between the different skeletal relationship groups
Summary
Correlation between the different skeletal structures is known [2]. These analyses often use either the Sella - Nasion (SN) Plane or the Frankfort Horizontal (FH) Plane as a plane of reference [3]. Variation in the FH-SN angulation affects cephalometric diagnosis [7]. The beta angle described by Baik et al (2004) to improve sagittal skeletal discrepancies diagnosis is helpful [10, 11]. The variations in sagittal skeletal relationships have an impact on other skeletal structures. This affects the harmony and balance of the craniofacial complex. It is of interest to document the difference between the FH-SN angles in different skeletal relationships
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