McDonald F, Pitt Ford T R
Department of Oral Biology, Orthodontics/Physiology, UMDS of Guy's Hospital, London.
Eur J Orthod. 1994 Feb;16(1):1-9. doi: 10.1093/ejo/16.1.1.
The influence of external load on the blood flow of permanent maxillary canine teeth was assessed by laser Doppler flowmetry (LDF). Blood flow readings were obtained from 10 maxillary canines and compared with the contralateral teeth simultaneously. Readings were obtained from the teeth before, during, and after the application of a 50 g force (gf) which was applied using a removable appliance. The probe for LDF measurement was held in place by a splint constructed of a silicone impression material designed to allow movement of the tooth, but prevent instability of the probe. LDF demonstrated a reading from the canine teeth consistent with recordings of blood flow, i.e. the traces were similar to the pulsatile nature of pulse pressure recordings taken from the subjects' ear-lobes. After loading the effect on the canine was (1) a decrease in blood flow as measured with LDF followed by (2) an increase in flow after 32.3 minutes (SD 4.74). These changes were statistically significant (P < 0.05) using Student's t-test. The increase in blood flow was still present after 24 and 48 hours, but returned to preload values within 72 hours. In two cases it was found that the decrease in blood flow remained as long as the load was applied. The response appeared similar to reactive hyperaemia found following placement of a tourniquet. However, the response time was substantially longer for the hyperaemic phase.
采用激光多普勒血流仪（LDF）评估外部负荷对恒上颌尖牙血流的影响。从10颗上颌尖牙获取血流读数，并与对侧牙齿同时进行比较。在使用可摘矫治器施加50克力（gf）之前、期间和之后从牙齿获取读数。用于LDF测量的探头通过由硅橡胶印模材料制成的夹板固定在适当位置，该夹板设计成允许牙齿移动，但防止探头不稳定。LDF显示尖牙的读数与血流记录一致，即这些轨迹类似于从受试者耳垂获取的脉压记录的搏动性质。加载后对尖牙的影响为：（1）用LDF测量的血流减少，随后（2）32.3分钟（标准差4.74）后血流增加。使用学生t检验，这些变化具有统计学意义（P<0.05）。在24小时和48小时后血流增加仍然存在，但在72小时内恢复到加载前的值。在两个病例中发现，只要施加负荷，血流减少就会持续。该反应似乎类似于扎止血带后发现的反应性充血。然而，充血期的反应时间要长得多。
