Physiological Root Resorption of Deciduous Teeth: An ATR-FTIR Approach

Area of Science:

• Biochemistry
• Dental Science
• Spectroscopy

Background:

• Deciduous teeth (De) undergo root resorption (RR) as permanent teeth erupt.
• Understanding the biological mechanisms of RR is crucial for managing primary dentition.
• Attenuated Total Reflectance-Fourier Transform-InfraRed (ATR-FTIR) spectroscopy offers a novel approach to study dental pulp changes during RR.

Purpose of the Study:

• To investigate the molecular composition of human deciduous dental pulps at various stages of root resorption using ATR-FTIR spectroscopy.
• To correlate specific biochemical changes within the dental pulp with the progression of root resorption.
• To establish ATR-FTIR as a reliable method for characterizing dental pulp during tooth replacement.

Main Methods:

• Human deciduous dental pulps (N=36) were categorized into four groups based on root resorption severity (G0-G3).
• Attenuated Total Reflectance-Fourier Transform-InfraRed (ATR-FTIR) spectroscopy was employed for sample analysis.
• Univariate (ANOVA) and multivariate (Principal Component Analysis, PCA) statistical methods were used to analyze spectral data.

Main Results:

• PCA successfully differentiated between the root resorption groups.
• Increased levels of nucleic acids and carbohydrates, and decreased levels of lipids were observed with advancing root resorption (p < 0.05).
• Changes in hydroxyapatite components (phosphates and carbonates) were detected, decreasing as root resorption progressed (p < 0.05).

Conclusions:

• ATR-FTIR spectroscopy is a rapid and effective technique for dental pulp characterization.
• Specific molecular alterations in deciduous dental pulp are significantly correlated with root resorption stages.
• This research provides new insights into the biological processes of root resorption and tooth replacement.