Photoacoustic Imaging for Periodontal Disease Examination.

Area of Science:

• Biomedical Engineering
• Oral Biology
• Medical Imaging

Background:

• Periodontal disease is a prevalent oral health issue following dental caries.
• Photoacoustic imaging (PAI) offers a novel, simple approach for tissue visualization.
• PAI utilizes a diode laser and microphone for image acquisition.

Purpose of the Study:

• To assess the efficacy of a basic PAI system for imaging periodontal disease.
• To evaluate PAI's performance in distinguishing healthy from inflamed periodontal tissues using an animal model.

Main Methods:

• Sprague-Dawley rats were used, divided into control and periodontitis groups (7, 11, 14 days induction).
• A custom PAI system, controlled via PC software (LabVIEW, Arduino IDE), was employed.
• Photoacoustic (PA) intensity measurements were taken from normal and diseased periodontal tissues.

Main Results:

• Optimal laser modulation frequency for PAI was identified as 19 kHz with a 50% duty cycle.
• Higher PA intensity was observed in periodontitis groups compared to the control group.
• Specific PA intensity values ranged from -68.71 dB (14-day group) to -73.07 dB (control).

Conclusions:

• A simple PAI system is feasible for differentiating normal and periodontitis-affected periodontal tissues.
• PAI demonstrates potential as a diagnostic tool for periodontal disease.
• The study highlights PAI's ability to detect pathological changes in periodontal tissues.