Heated tobacco smoking may decrease gingival blood flow in humans
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Fukuoka Dental College, Fukuoka, Japan
Department of Oral Health Sciences, Faculty of Nursing and Health Care, BAIKA Women's University, Osaka, Japan
Publication date: 2019-10-12
Corresponding author
Yu Takaesu   

Fukuoka Dental College, Fukuoka, Japan
Tob. Induc. Dis. 2019;17(Suppl 1):A41
Earlier studies on crevicular fluid flow and gingival blood flow indicated increased gingival blood flow after smoking. In this study, we measured gingival blood flow following heated tobacco smoking.

We used a laser Doppler flowmeter (LDF) with different optic-fiber separations of 0.3 mm (LDF-0.3) and 0.7 mm (LDF-0.7). We have confirmed that the LDF-0.3 and difference between LDF-0.7 and LDF-0.3 (LDF-d) represented gingival blood flow in superficial fraction and deeper fraction, respectively. Eight heated-tobacco smokers consuming 4-25 daily volunteered and were asked not to smoke at least 5 h before the experiment. Gingival blood flow of upper papillary gingiva of frontal teeth was measured before and after smoking. Subjects smoked heated tobacco for about 5 min.

Changes in LDF-0.3 and LDF-d after smoking were not statistically significant. However, LDF-0.7 significantly decreased after smoking (P<0.05). Five subjects showed a decrease in LDF-0.3 immediately after smoking, while smoking in 5 subjects caused a relative increase in LDF-d after smoking. Decreases in gingival blood flow in both fractions of gingiva after smoking were found only in one subject.

These results suggest that heated tobacco smoking may decrease gingival blood flow particularly in superficial layer of gingival.

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