A comparative study between data obtained from conventional lateral cephalometry and reconstructed three-dimensional...

Area of Science:

• Dentistry
• Radiology
• Orthodontics

Background:

• Cephalometric analysis is crucial in orthodontics and dentofacial orthopedics.
• Two-dimensional (2D) cephalometric radiography is a standard diagnostic tool.
• Three-dimensional computed tomography (3D CT) offers advanced imaging capabilities.

Purpose of the Study:

• To assess the concordance of cephalometric measurements between 2D radiography and 3D CT.
• To identify the most reliable 3D Frankfort horizontal (FH) plane for cephalometric analysis.
• To compare the accuracy of various cephalometric analyses using both imaging modalities.

Main Methods:

• The study evaluated eight cephalometric angles, including gonial angle, palatal angle, and SNA/SNB.
• Measurements were performed on both 2D lateral cephalometry and reconstructed 3D CT data.
• Intraclass correlation coefficients (ICCs) were used to determine measurement concordance and FH plane reliability.

Main Results:

• High ICCs were observed for mandibular plane angle (MPA), upper occlusal plane angle (UOPA), SNA, and SNB.
• Lower ICCs were found for gonial angle, palatal angle, U1 to occlusal plane, and U1 to FH plane.
• No significant differences in concordance were found among the four FH planes defined on 3D CT.

Conclusions:

• 3D CT-based FH planes demonstrate comparable concordance to 2D cephalometry's FH plane.
• Defining the 3D FH plane using two orbitales and one porion is suggested for optimal reproducibility.
• The study highlights the potential of 3D CT in cephalometric analysis while emphasizing precise landmark identification.