Correlation between sagittal condylar guidance angles obtained using radiographic and protrusive occlusal record...

Area of Science:

• Dentistry
• Radiology
• Orthodontics

Background:

• Sagittal condylar guidance angles (SCGAs) are crucial for understanding jaw movements and occlusal relationships.
• Accurate measurement of SCGAs is essential for prosthodontic and orthodontic treatment planning.
• Traditional methods for SCGAs measurement, like the protrusive occlusal record, can be time-consuming and operator-dependent.

Purpose of the Study:

• To compare sagittal condylar guidance angles (SCGAs) measured from panoramic and cone-beam computed tomography (CBCT) images with those obtained from a protrusive occlusal record.
• To evaluate the reliability and correlation of radiographic SCGA measurements against a standard clinical method.

Main Methods:

• SCGAs were measured in 20 patients using a protrusive interocclusal record on a semi-adjustable articulator.
• Panoramic and CBCT images (panoramic and cross-sections) were acquired for each patient.
• Measurements utilized the Frankfort horizontal reference line and mean curvature line on radiographic images, with data analyzed using t-tests and Pearson's correlation.

Main Results:

• Mean SCGAs varied across methods: protrusive record (30.1-30.2°), panoramic (38.7-38.9°), CBCT panoramic sections (35.4-36.8°), and CBCT cross sections (35.3-36.1°).
• Significant differences were observed among the SCGA measurement groups.
• Strong positive correlations were found between radiographic and protrusive occlusal record measurements (Pearson's r: 0.791-0.918).

Conclusions:

• Radiographic imaging, particularly CBCT, demonstrates strong correlation with the protrusive occlusal record for SCGA measurement.
• Panoramic and CBCT imaging offer viable, potentially more efficient alternatives for assessing sagittal condylar guidance angles.
• These findings support the use of radiographic techniques in clinical practice for evaluating SCGAs.