Obturation


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obturation

[‚äb·tə′rā·shən]
(medicine)
The closing of an opening or passage.
A form of intestinal obstruction in which the lumen is occupied by its normal contents or by foreign bodies.
(ordnance)
Sealing of the breech of a gun to prevent escape of propellant gases in firing.

Obturation

 

the sealing of the barrel when firing a firearm in order to prevent the forward or backward escape of powder gases.

In guns that load by cartridge, obturation is achieved by the use of a brass cartridge case that expands when the gun is fired and ensures that the barrel is sealed on the breech side. In artillery guns that are loaded separately, obturation is achieved by using special devices in the breech called obturators. Escape of the gases in the direction of shell movement is prevented by the rotary bands of shells and casings of bullets; in mortars it is prevented by annular grooves on the cylindrical part of the shell.

References in periodicals archive ?
Intradentinal antimicrobial action and filling quality promoted by ultrasonic agitation of epoxy resin-based sealer in endodontic obturation. J Appl Oral Sci 2017; 25(6):641-9.
Patients in Group-II were recalled after 5 days for obturation. Patients were recalled to record the pain score using VAS to measure post-obturation pain within 48 hours after the procedure.
The same procedure was performed in teeth with inadequatelly filled canals, which were also carriers of fixed prosthetic work or there was no possibility for revision of previous obturation. A classic surgical technique for apicoectomy was performed.
The bond strength of ActiV GP was higher compared to methacrylate-based obturation systems (EndoREZ and Resilon).
Lee, "Dynamic intratubular biomineralization following root canal obturation with pozzolan-based mineral trioxide aggregate sealer cement," Scanning, vol.
Among filling techniques, however, the adopted single-cone obturation is considered relatively safe regarding the development of lateral condensation forces [30].
For any given obturation force, dynamic friction between bullet and bore depends on the materials involved.
Three teeth were used for the negative control, which were prepared but did not receive any type of obturation neither were inoculated with the microorganism; three teeth were also used for the positive control, and these were prepared but did not receive any type of obturation and were inoculated with the microorganism.
Group 2 (continuous wave condensation technique using an Elements Obturation Unit (group EOU)).
The treatment suggested for the patient was marsupialization combined with obturation of the defect.