Does the chin projection and sella point position affect the W angle reliability?

Area of Science:

• Orthodontics
• Cephalometric Analysis
• Dental Morphology

Background:

• The W angle is a cephalometric measurement used in orthodontics.
• The reliability and validity of the Sella (S) and G points in W angle assessment require further investigation across different malocclusions.

Purpose of the Study:

• To compare the reliability and validity of the Sella (S) and G points for W angle analysis.
• To evaluate the influence of different malocclusions on the W angle.
• To assess the impact of chin projection and sella point position on the W angle.

Main Methods:

• Cephalometric radiographs of 570 individuals (aged 15-25) with Class I, II, and III malocclusions were analyzed.
• Subgroup analysis was performed based on chin projection, vertical sella position, and sagittal sella position.
• Statistical analysis, including correlation tests, was used to determine relationships between variables.

Main Results:

• Chin projection showed a significant positive correlation with the W angle in all malocclusion classes (p < 0.001).
• The vertical position of the sella point was positively correlated with the W angle in subgroups with high vertical dimensions (p < 0.001).
• The sagittal position of the sella point did not significantly affect the W angle.

Conclusions:

• Chin projection and the vertical position of the sella point are significant factors influencing the W angle.
• The sagittal position of the sella point has a negligible impact on the W angle.
• These findings contribute to a better understanding of cephalometric analysis in orthodontics.