根管内ベント設置によるUltrafilによる根管充塡法に関する研究

抄録

Abstract : The present study was performed to evaluate the influence of vent made in the root canal during root canal obturation using Ultrafil. For the experiment, a root canal model made of polyester resin was used, in which the root canal taper was varied according to the size corresponding to No. 40 of the ISO specification. A 30-gauge injection needle was used as the vent for the root canal, and Ultrafil Regular set was employed as root canal obturation gutta-percha. The obturation status of the root canal was determined by evaluation using x-ray, observation of the continuous cutting surface from 0.5 mm to 6.5 mm of root canal tip every 1 mm, and measurement of the proportion of the gutta-percha area in the cross-sectional area of the root canal (gutta-percha condensing ratio). The conclusions were as follows :

 1. In case root canal obturation was performed without a vent in the root canal, to which injection nozzle can not be inserted up to the tip of the root canal, gutta-percha was not injected up to the tip of the root canal.

 2. In case root canal obturation was performed by making a vent in the root canal, to which injection nozzle can not be inserted up to the tip of the root canal, the vent served effectively as the discharge route for the air or the excessive amount of sealer.

 3. In the root canal model, in which a vent was made in the root canal and obturation was performed, gutta-percha was condensed satisfactorily at all cutting positions of the root canal.

 4. In the root canal model, in which a vent was made and obturation was performed, there was no influence of the difference of the root canal taper on obturation status, and no difference in gutta-percha the condensing ratio was noted.