Determination of the gonial angle from the orthopantomogram

Area of Science:

• Dentistry
• Radiology
• Anatomy

Background:

• The gonial angle is a key anatomical landmark in the mandible.
• Accurate measurement of the gonial angle is crucial for orthodontic and surgical planning.
• Lateral cephalograms are traditionally used but have limitations.

Purpose of the Study:

• To evaluate the accuracy of orthopantomograms in determining the gonial angle.
• To compare orthopantomograms with lateral cephalograms for gonial angle measurement.
• To assess the feasibility of individually measuring right and left gonial angles using orthopantomograms.

Main Methods:

• Measurements of the gonial angle were performed using orthopantomograms.
• Comparison of gonial angle measurements from orthopantomograms and lateral cephalograms.
• Analysis of the accuracy and reliability of both imaging modalities.

Main Results:

• Orthopantomograms provide gonial angle measurements with accuracy comparable to lateral cephalograms.
• Individual right and left gonial angles can be reliably determined from orthopantomograms.
• Orthopantomograms mitigate issues of image superimposition present in lateral cephalograms.

Conclusions:

• Orthopantomograms are a valid and accurate tool for gonial angle determination.
• The use of orthopantomograms simplifies the assessment of mandibular anatomy.
• Orthopantomograms offer advantages over lateral cephalograms for gonial angle analysis.