Abstract
Introduction: The angle between Frankfort horizontal (FH) plane and Sella-Nasion (SN) plane is considered to be 7°. Various studies have shown that the FH-SN angulations could vary; which can affect cephalometric diagnosis.Objective: To determine average FH-SN angle for a group of Nepalese orthodontic patients. The secondary objectives were to assess whether the FH-SN angle exhibits sexual dimorphism and to evaluate the FH-SN angle in different skeletal relationships.Materials & Method: Lateral cephalograms of 238 orthodontic patients were hand traced and the angle between the FH and SN plane was measured and recorded. The cephalograms were also classified as skeletal Class I, II or III cases using Wits appraisal.Result: The average FH-SN angle was 6.71° ± 3.13°. FH-SN angle was greater in female samples compared to males. However, the difference was not statistically significant. Similarly, the ANOVA analysis revealed no significant difference between FH-SN angles in different skeletal relationships.Conclusion: The average FH-SN angle for a group of Nepalese orthodontic patients was 6.71° ± 3.13°. There was no statistically significant difference in FH-SN angle between skeletal Class I, II and III relationships
Highlights
The angle between Frankfort horizontal (FH) plane and Sella-Nasion (SN) plane is considered to be 7°
Two of these reference planes which have passed the test of time are Frankfort horizontal plane (FH) and Sella-Nasion plane (SN plane)
Though all cephalometric planes show some variations, SN plane followed by FH plane have been found to be relatively stable.[4]
Summary
The angle between Frankfort horizontal (FH) plane and Sella-Nasion (SN) plane is considered to be 7°. Various studies have shown that the FH-SN angulations could vary; which can affect cephalometric diagnosis. Cephalometric analysis has been a mainstay of orthodontic diagnosis using different reference planes drawn by various investigators.[1,2] Two of these reference planes which have passed the test of time are Frankfort horizontal plane (FH) and Sella-Nasion plane (SN plane). Used cepahlometric analyses utilize these two planes.[3] Though all cephalometric planes show some variations, SN plane followed by FH plane have been found to be relatively stable.[4] The angle between these two planes is considered to be 7°.5-7. Any variation in the FH-SN angulation can affect the cephalometric diagnosis.[8,9] various studies have shown that the FH-SN angulation is not always 7°.10,11. The angle between these two planes is considered to be 7°.5-7 Any variation in the FH-SN angulation can affect the cephalometric diagnosis.[8,9] various studies have shown that the FH-SN angulation is not always 7°.10,11 assessment of FH-SN angle is imperative before drawing any cephalometric conclusion
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