Evaluation of residual dentin thickness using quantitative light-induced fluorescence technology

Area of Science:

• Dental Materials Science
• Diagnostic Technologies in Dentistry
• Cariology and Operative Dentistry

Background:

• Residual dentin thickness (RDT) is a critical factor in restorative dentistry, influencing pulp vitality and treatment outcomes.
• Quantitative light-induced fluorescence (QLF) is a non-invasive technique used to detect and quantify demineralization and remineralization in tooth structure.
• Understanding the relationship between RDT and QLF can potentially improve diagnostic accuracy and treatment planning.

Purpose of the Study:

• To investigate the correlation between residual dentin thickness (RDT) and quantitative light-induced fluorescence (QLF) values.
• To analyze the tendencies of this correlation in both simulated vital (filled) and non-vital (unfilled) pulp conditions.

Main Methods:

• Forty extracted human molars were divided into filled (simulated vital pulp) and unfilled groups.
• Teeth were sectioned, and samples with RDTs of 2 mm, 1 mm, and 0.5 mm were prepared.
• Quantitative light-induced fluorescence (QLF) images were captured using the QLF-D Biluminator™ 2+ system, and ΔF values were analyzed.

Main Results:

• A significant positive correlation was observed between residual dentin thickness and ΔF values (P < 0.05).
• Mean ΔF values showed a trend of increasing negativity with decreasing RDT in both groups.
• High intraclass correlation coefficients (0.831 for filled, 0.917 for unfilled) indicated excellent inter-operator reliability.

Conclusions:

• Residual dentin thickness and quantitative light-induced fluorescence (QLF) ΔF values are significantly and positively correlated.
• This correlation is robust and consistent across different operators, suggesting the reliability of QLF in assessing RDT-related changes.
• The findings support the potential use of QLF as a diagnostic tool to evaluate conditions influenced by residual dentin thickness.