Reliability analysis of two methods for measuring active enamel demineralization: An in vitro study

Area of Science:

• Dental research
• Biomaterials science
• Image analysis in dentistry

Background:

• Accurate measurement of enamel demineralization is crucial for assessing lesion progression and treatment efficacy.
• Traditional methods like digital calipers may have limitations in precision and reproducibility.
• Computerized image analysis offers a potentially more objective approach to quantifying demineralization areas.

Purpose of the Study:

• To compare the intra- and inter-examiner reliability of digital caliper (DC) and Image Tool (IT) software for measuring active enamel demineralization lesion area.
• To assess the impact of a delimiting window on measurement accuracy and reliability for both methods.

Main Methods:

• Artificial enamel demineralization lesions were created on bovine teeth in vitro.
• Three examiners measured lesion areas three times using both DC and IT software, with and without a delimiting window.
• Intraclass correlation coefficient (ICC) and Altman-Bland analysis were used to evaluate reliability.

Main Results:

• Image Tool software exhibited excellent intra-examiner reproducibility (ICC 0.915-0.990).
• Digital caliper showed significantly lower intra-examiner reproducibility (ICC 0.378-0.665).
• Both methods demonstrated good inter-examiner reproducibility, with IT software showing less variability.

Conclusions:

• Computerized image analysis using Image Tool software provides higher intra- and inter-examiner reliability for estimating enamel demineralization lesion area.
• The presence or absence of a delimiting window did not significantly alter the reliability of either method.
• Image Tool software is a more reliable tool for quantifying enamel demineralization compared to digital calipers.