Comparison of different parameters for recording sagittal maxillo mandibular relation using natural head posture: A...

Area of Science:

• Orthodontics
• Cephalometric analysis
• Skeletal relationships

Background:

• Several cephalometric parameters assess anteroposterior jaw relationships, including ANB, NA-Pog, AB-NPog, Wits appraisal, Harvold's unit length difference, and Beta angle.
• Limited literature exists comparing and correlating these diverse measurements.
• This study aimed to correlate these sagittal skeletal parameters in an Indian population.

Purpose of the Study:

• To correlate commonly used cephalometric parameters for anteroposterior jaw relationship assessment.
• To evaluate the correlation of ANB, NA-Pog, AB-NPog, Wits appraisal, Harvold's unit length difference, and Beta angle in Indian subjects.

Main Methods:

• Fifty adult Indian subjects (18-26 years) with Angle's Class I occlusion and specific facial profile criteria were selected.
• Cephalograms were taken in natural head position (NHP).
• Seven sagittal skeletal parameters were measured and statistically analyzed using correlation coefficient analysis with Wits appraisal as reference.

Main Results:

• The ANB angle demonstrated a statistically significant correlation for the total sample, but not for individual subgroups.
• Wits appraisal showed a significant correlation exclusively within the female sample group.
• The accuracy of ANB for individual groups was deemed potentially limited.

Conclusions:

• Angle AB-NPog and Harvold's unit length difference are recommended for anteroposterior (A-P) skeletal dimension assessment if natural head position (NHP) cephalograms are not feasible.
• Biologic variability necessitates the use of multiple readings for verification.
• Further research is needed to establish robust correlations across diverse populations.