Microcomputed Tomography Calibration Using Polymers and Minerals for Enamel Mineral Content Quantitation

Area of Science:

• Biomaterials Science
• Dental Research
• Materials Science

Background:

• Accurate quantitation of enamel mineral content is crucial for dental research, particularly in understanding enamel caries.
• Existing methods may lack accessibility or reproducibility for clinical researchers.
• Development of standardized calibration materials is needed to improve enamel analysis.

Purpose of the Study:

• To develop accessible and reproducible calibration standards (CSs) for the accurate quantitation of enamel mineral content.
• To establish a reliable method for measuring enamel density using microcomputed tomography.
• To validate the developed calibration standards with biological samples.

Main Methods:

• Various materials (PET, acetal, PPS, selenite, alabaster, aragonite, fluorite) were fashioned into discs to serve as calibration standards.
• Microcomputed tomography (micro-CT) was used to examine the discs after applying image correction techniques.
• The linear relationship between greyscale values (GSV) and physical densities was analyzed, and a calibration function was established and validated.

Main Results:

• A strong linear correlation (R2 = 0.994) was found between the mean GSV of calibration standards and their calculated densities.
• The calibration method demonstrated high accuracy, with a relative error of 1.2% for bovine enamel.
• Densities of sound human enamel were accurately determined to be within the range of 2.6-3.1 g/cm3.

Conclusions:

• A simple, valid, and reproducible method for quantifying enamel mineral content has been successfully developed.
• The established calibration standards provide a reliable tool for clinical researchers.
• This system has the potential to significantly advance knowledge in enamel caries research.