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Heated tobacco smoking may decrease gingival blood flow in humans

机译：吸烟吸烟可能会减少人类的牙龈血流量

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Objective: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.Methods: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.Results:Changes in LDF-0.3 and LDF-d after smoking were not statistically significant. However, LDF-0.7 significantly decreased after smoking (P0.05). 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.Conclusions:These results suggest that heated tobacco smoking may decrease gingival blood flow particularly in superficial layer of gingival.
机译：目的：较早的研究表明，吸烟后龈沟液流动和牙龈血流增加。在这项研究中，我们测量了加热吸烟后的牙龈血流量。方法：我们使用了激光多普勒流量计（LDF），其光纤间隔为0.3 mm（LDF-0.3）和0.7 mm（LDF-0.7）。我们已经证实，LDF-0.3和LDF-0.7与LDF-0.3（LDF-d）之间的差异分别代表了表层部分和较深部分的牙龈血流。八名每天消耗4-25杯热烟的吸烟者自愿参加，并被要求在实验前至少5小时不吸烟。吸烟前后测量前牙上乳头齿龈的牙龈血流量。受试者吸烟约5分钟。结果：吸烟后LDF-0.3和LDF-d的变化无统计学意义。然而，吸烟后LDF-0.7明显降低（P <0.05）。五名受试者在吸烟后立即显示LDF-0.3降低，而五名受试者在吸烟后导致LDF-d相对增加。仅在一名受试者中发现吸烟后两部分牙龈中的牙龈血流减少。结论：这些结果表明，吸烟者吸烟可能会减少牙龈血流，特别是在牙龈表层。

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