Measurement of erosion depth using microcomputed tomography and light microscopy

Area of Science:

• Dental research
• Biomaterials science
• Imaging techniques

Background:

• Tooth erosion is dental hard tissue loss caused by acid attacks.
• Accurate measurement of erosion depth is crucial for understanding its progression and developing preventive strategies.

Purpose of the Study:

• To compare the accuracy of micro-computed tomography (microCT) and light microscopy (LM) in measuring dentin and enamel erosion depth.
• To evaluate the correlation and agreement between microCT and LM for quantifying acid-induced tooth erosion.

Main Methods:

• Human enamel and dentin blocks were prepared and subjected to either water (negative control) or 1.0% citric acid (positive control) treatment.
• Specimens were analyzed using microCT for initial depth measurements.
• Following microCT scanning, specimens were sectioned and examined under light microscopy for comparative depth analysis.
• Statistical analysis included Pearson correlation and Wilcoxon Signed Rank tests.

Main Results:

• Both microCT and LM demonstrated comparable measurements for enamel erosion depth (NC: ~0.6 µm, PC: ~39 µm) and dentin erosion depth (NC: ~0.7 µm, PC: ~48 µm).
• A highly significant positive correlation (r = 0.998, p < .001) was found between microCT and LM measurements.
• No statistically significant differences were observed between the two measurement methods (p = .584).

Conclusions:

• MicroCT and LM are reliable and comparable methods for quantifying tooth erosion depth in enamel and dentin.
• The study suggests microCT as a preferred method when specimen preservation is a priority.
• Both techniques provide valuable data for research on dental erosion and its management.