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Effects of local injections of vasoactive drugs on eruption rate of incisor teeth in anaesthetized rats.

Abstract：

OBJECTIVES:Previous studies have suggested that the vasculature in the dental pulp and periodontal tissues plays an important role in producing the eruptive force in continuously erupting incisors. The aim of the present study was to investigate the effects of local injections of vasoactive drugs on regional blood flow within the socket in association with axial tooth movements to clarify the role of the local vascular system on tooth eruption. DESIGN:Twenty-two male Wistar rats, weighing 309+/-21 g (S.D.), were immobilized with halothane anaesthesia. We measured the regional blood flow within the socket using a laser Doppler flowmeter, and the axial movements of the mandibular incisor using a displacement detector. The local injections of the vasoactive drugs, adrenaline (0.001, 0.01, and 0.1 microg/kg body weight) and acetylcholine (0.05, 0.5, and 5 microg/kg), into the base of the incisor were performed by a microinjector at a rate of 1 microl/kg body weight. RESULTS:The injections of various doses of adrenaline decreased the mean regional blood flow and eruption rate dose-dependently, while those of acetylcholine increased the mean regional blood flow and eruption rate dose-dependently. The changes in the regional blood flow and eruption rate were transient. Significant correlations (p<0.001) were obtained between the maximum and minimum values in the regional blood flow and in the eruption rate following injections of various doses of adrenaline and acetylcholine. CONCLUSION:These results support the hypothesis that the eruptive force of the rat incisor is closely related to the vasculature within the socket.

journal_name

Arch Oral Biol

journal_title

Archives of oral biology

authors

Shimada A,Komatsu K,Chiba M

doi

10.1016/j.archoralbio.2005.11.001

subject

Has Abstract

pub_date

2006-06-01 00:00:00

pages

449-56

issue

6

eissn

0003-9969

issn

1879-1506

pii

S0003-9969(05)00263-3

journal_volume

51

pub_type

杂志文章

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