Quantitative measurements obtained by micro-computed tomography and confocal laser scanning microscopy

Area of Science:

• Endodontics
• Dental Materials Science
• Biomedical Imaging

Background:

• Internal resorption requires accurate measurement for effective treatment.
• Confocal laser scanning microscopy (CLSM) and micro-computed tomography (micro-CT) are advanced imaging techniques.
• Comparing these methods is crucial for selecting optimal diagnostic tools.

Purpose of the Study:

• To compare dimensional measurements of simulated internal resorption cavities using CLSM and micro-CT.
• To evaluate the correlation and agreement between the two imaging modalities.

Main Methods:

• Artificial internal resorption cavities were prepared in human tooth sections.
• Measurements of cavity diameter and volume were performed using CLSM and micro-CT.
• Paired t-tests and regression analysis were used to compare and correlate the data.

Main Results:

• Both methods demonstrated a strong correlation for diameter (R² = 92.9%) and volume (R² = 91%).
• Micro-CT measurements were significantly lower than CLSM for both diameter (P < 0.001) and volume (P < 0.01).
• Mean differences were 0.061 mm for diameter and 0.004 mm³ for volume.

Conclusions:

• A strong correlation exists between CLSM and micro-CT for assessing internal resorption cavities.
• Micro-CT tends to underestimate cavity dimensions compared to CLSM.
• These findings highlight potential discrepancies when using micro-CT for quantitative analysis of internal resorption.