Laser speckle imaging: a novel method for detecting dental erosion

Area of Science:

• Dental Science
• Biophotonics
• Materials Science

Background:

• Dental erosion is a prevalent non-carious tooth wear caused by chemical processes.
• Early mineral loss in enamel is detectable using sensitive imaging techniques like speckle imaging.
• Understanding microstructural changes is crucial for quantifying erosion progression.

Purpose of the Study:

• To investigate laser speckle imaging analysis in the spatial domain for quantifying microstructural shifts on tooth surfaces.
• To assess the efficacy of laser speckle imaging in an artificial dental erosion model.
• To establish a correlation between acid exposure and changes in tooth microstructure.

Main Methods:

• Utilized 32 bovine incisor fragments subjected to artificial erosion using a cola-based beverage (pH ~2.5).
• Groups were exposed to acid etching for 10, 20, 30, and 40 minutes, twice daily for 7 days.
• Analyzed laser speckle contrast maps (LASCA) of eroded regions compared to sound enamel.

Main Results:

• Laser speckle contrast maps showed proportional shifts with increased acid etching duration.
• Observed LASCA map shifts of 18%, 23%, 39%, and 44% for 10, 20, 30, and 40 minutes of acid exposure, respectively.
• Demonstrated a quantifiable relationship between erosion time and speckle pattern changes.

Conclusions:

• Laser speckle imaging analysis is a sensitive method for detecting and quantifying microstructural changes in tooth enamel due to erosion.
• This study establishes a novel correlation between speckle patterns and the progression of dental erosion.
• The findings suggest potential for laser speckle imaging in early diagnosis and monitoring of dental erosion.