Laser Doppler flowmetry: reproducibility, reliability, and diurnal blood flow variations

Area of Science:

• Biomedical Engineering
• Dental Research
• Physiology

Background:

• Accurate measurement of pulpal blood flow is crucial for diagnosing dental conditions.
• Laser Doppler flowmetry (LDF) is a technique used to assess microvascular perfusion.
• Standardizing LDF probe placement is essential for reliable readings.

Purpose of the Study:

• To assess the reliability of LDF for measuring pulpal blood flow with a silicone splint and specific probe inclination.
• To investigate diurnal variations in pulpal blood flow using LDF.

Main Methods:

• Fabrication of 41 silicone splints for in vivo LDF measurements on human maxillary incisors.
• Training 30 dentists to prepare splint shafts and comparison with 11 prepared by a principal investigator.
• Analysis of splint shaft angles using Cone Beam CT.
• Recording LDF for 90 seconds per splint and statistical analysis.

Main Results:

• LDF measurements using splints showed significantly lower variance compared to those without splints.
• Significant diurnal variations in LDF values were observed.
• Splint use demonstrated superiority in LDF measurement reliability.

Conclusions:

• Silicone splint use improves the reliability of LDF for measuring pulpal blood flow.
• Diurnal variations in pulpal blood flow are detectable by LDF and necessitate consideration during data collection.
• Standardized splint-assisted LDF offers a more reliable method for assessing dental pulp perfusion.