[Effect of erigeron breviscapus on the expression of vascular endothelial growth factor in the periodontal tissues of rabbits during orthodontic tooth movement].
OBJECTIVE
To detect the effect of erigeron breviscapus on the expression of vascular endothelial growth factor (VEGF) in the periodontal tissues during orthodontic tooth movement.


METHODS
45 rabbits were divided into 3 groups (groups A, B and C). Groups A and B included experimental group of 1, 3, 7 and 14 days respectively. The mandibular first molar of each experimental rabbit was observed. The rabbits of group A and group B received iontophoresis with erigeron breviscapus into the right (group A-R and group B-R) and with normal sodium into the left as the control (group A-L and group B-L). Additionally, the rabbits of group B were designed orthodontic appliance, by which 0.78 N mesial force was applied to pull the mandibular first molars. Group C, group of 0 day, was no iontophoresis and orthodontic appliance as the control. After killed on schedule, the amount of experimental tooth movement was measured and the expression of VEGF was examined by immunohistochemical method.


RESULTS
The amount of experimental tooth movement increased successively from 1 to 14 days. The differences among days 3, 7 and 14 were significant in the comparison between group B-R and group B -L (P < 0.01). The expression of VEGF in groups A-R and B-L enhanced apparently compared with that in groups C and A-L (P < 0.01), but that in group B-R was the most apparent (P < 0.01). The expression of VEGF reached the peak level on day 3 in groups A-R and B-R (P < 0.01), but it reached the peak level on day 7 in group B-L (P < 0.01).


CONCLUSIONS
Erigeron breviscapus by iontophoresis can accelerate orthodontic tooth movement, and can meanwhile up-regulate the expression of VEGF in periodontium in the earlier period of orthodontic tooth movement. Thus it can be presumed that one of its mechanisms for erigeron breviscapus to accelerate orthodontic tooth movement is erigeron breviscapus effects the metabolism and differentiation of osteoblast and osteoclast through up-regulating the expression of VEGF in periodontium.
Liu
Chang-Geng
CG
Dept. of Oral Medicine, Xiangya Second Hospital of Central South University, Changsha 410011, China.
Huang
Sheng-Gao
SG
Ling
Tian-You
TY
Feng
De-Yun
DY
Huang
Ping
P
Zhang
Jian-Xing
JX
D000818:Animals; D002454:Cell Differentiation; D049919:Erigeron; D008963:Molar; D009967:Orthodontic Appliances; D010006:Osteoblasts; D010010:Osteoclasts; D010513:Periodontal Ligament; D010519:Periodontium; D011817:Rabbits; D013314:Stress, Mechanical; D014087:Tooth Movement Techniques; D042461:Vascular Endothelial Growth Factor A
D042461:Vascular Endothelial Growth Factor A