Yamaguchi K, Nanda R S, Kawata T
Department of Orthodontics, University of Oklahoma, Oklahoma City 73190.
Angle Orthod. 1991 Fall;61(3):193-203; discussion 203-4. doi: 10.1043/0003-3219(1991)061<0193:AR>2.0.CO;2.
The relationship of gingival blood flow to the magnitude and duration of applied force was studied in humans using Laser Doppler flowmetry. The sample consisted of five adult volunteers with interdental space between their maxillary central incisors. The labial surface of each central incisor was bonded with a buccal tube and a spring force was applied to close the space. The forces applied were 50 g, 80 g, 120 g, and 250 g. Each force was applied for 30 seconds, 60 seconds, 90 seconds, 5 minutes, and 10 minutes. The blood flow signals were recorded continuously using a pen recorder. Measurements indicated that blood flow was negatively correlated to the amount of force applied. The duration of reactive hyperemia was positively correlated to the duration of force. Laser Doppler flowmetry measures blood flow in superficial periodontal tissues. Yet, the relationship of blood flow changes to the magnitude and duration of orthodontic force suggests that measurements of gingival blood flow may provide a means of estimating physiologic orthodontic forces.
使用激光多普勒血流仪在人体中研究了牙龈血流量与施加力的大小和持续时间之间的关系。样本包括五名成年志愿者，他们上颌中切牙之间存在牙间隙。在每个中切牙的唇面粘结一个颊面管，并施加弹簧力以关闭间隙。施加的力分别为50克、80克、120克和250克。每个力分别施加30秒、60秒、90秒、5分钟和10分钟。使用笔录记录器连续记录血流信号。测量表明，血流量与施加的力的大小呈负相关。反应性充血的持续时间与力的持续时间呈正相关。激光多普勒血流仪测量牙周浅表组织中的血流量。然而，血流变化与正畸力的大小和持续时间之间的关系表明，牙龈血流量的测量可能提供一种估计生理性正畸力的方法。
