The effect of continuous intrusive force on human pulpal blood flow
The effect of continuous intrusive force on human pulpal blood flow
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DOI：
10.1093/ejo/24.2.159
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发表时间：
2002-04-01
影响因子：
2.6
通讯作者：
Mitani, H
中科院分区：
文献类型：
--
作者：
Sano, Y;Ikawa, M;Mitani, H
本研究的目的是探讨持续侵入力对人髓血流量（PBF）的影响。记录13名临床牙冠和牙周组织健康的健康受试者（实验组，n = 8；对照组，n = 5）的13个重要的左上中切牙。用激光多普勒流量计（LDF）记录PBF，并在牙齿上涂上不透明的橡胶坝。在三个观察阶段比较牙髓内基础血流量（BBFP）：(1)正畸弓丝固定前；(2)导线接合时（对照组：不施加力；实验组：持续施加0.5 N的侵入力）；(3)拆除电线后。在实验组中，对检查牙齿的切缘施加短暂的侵入力（0.5、1.0和2.0 N），以确定其对PBF急性变化的影响。结果表明：(1)实验组在连续施加侵入力期间BBFP显著降低（P < 0.05），拔丝后BBFP恢复。(2)短时间侵入力对PBF有显著的降低作用（P < 0.05），但降低率（百分比）在观察期内无显著差异。结果表明，本研究所采用的测量技术可以检测到连续施加正畸力所产生的PBF变化。
The purpose of this study was to examine the effect of continuous intrusive force application on human pulpal blood flow (PBF). Recordings were made of 13 vital upper left central incisors in 13 healthy participants (experimental group, n = 8; control group, n = 5) who had clinically healthy tooth crowns and periodontal tissues. PBF was recorded by means of a laser Doppler flow meter (LDF) with an opaque rubber dam applied to the teeth. The basal blood flow in the pulp (BBFP) was compared during three observation periods: (1) before orthodontic archwire engagement; (2) during wire engagement (control group: no application of force; experimental group: continuous intrusive force of 0.5 N); and (3) after the removal of the wire. In the experimental group, brief intrusive forces (magnitude 0.5, 1.0, and 2.0 N) were applied to the incisal edge of the examined teeth to determine their effect on acute changes in PBF.The results obtained were as follows: (1) the BBFP in the experimental group was significantly reduced during the period of continuous intrusive force application (P < 0.05), which was followed by recovery after the removal of the wire. (2) Brief intrusive force produced a significant reduction of PBF (P < 0.05), but the reduction rate (percentage) did not differ significantly during the observation periods. The results indicate that the measurement technique shown in this study could detect PBF change produced by continuous orthodontic force application.