Pulpal blood flow recorded from human premolar teeth with a laser Doppler flow meter using either red or infrared light

作者：Kijsamanmith Kanittha; Timpawat Siri****; Vongsavan Noppakun^*; Matthews Bruce

来源：Archives of Oral Biology, 2011, 56(7): 629-633.

DOI：10.1016/j.archoralbio.2010.12.003

• Laser Doppler flow meter
• Pulpal blood flow
• Human premolar teeth

Objective: To compare red (635 nm) and infrared (780 nm) light for recording pulpal blood flow from human premolar teeth.
Design: Recordings were made from 11. healthy teeth in 9 subjects (aged 16-30 years) using a laser Doppler flow meter (Periflux 4001) equipped with both red and infrared lasers. Average blood flow signals were obtained with both light sources alternately from each tooth under five conditions: intact tooth without opaque rubber dam, intact tooth with dam, after injecting local anaesthetic (3% Mepivacaine) (LA) over the apex of the tooth and cavity preparation to almost expose the pulp, after removal and replacement of the pulp, and with the root canal empty.
Results: With infrared light, the dam significantly decreased the mean blood flow by 80%. Injecting LA and cavity preparation had no significant effect. Removal and replacement of the pulp reduced the mean blood flow by 58%. There was no further change when the pulp was removed. With red light, the dam reduced the signal from intact teeth by 60%. Injecting LA and cavity preparation had no significant effect. The signal fell by 67% after pulp removal and replacement and did not change significantly when the pulp was removed.
Conclusions: Opaque rubber dam minimises the contribution of non-pulpal tissues to the laser Doppler signal recorded from premolars. Using dam, the pulp contributed about 60% to the blood flow signal with both red and infrared light. The difference between them in this respect was not significant.

• 出版日期2011-7