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 ?
In this work, we opted for con- ventional gutta percha as it represents the reference material for canal obturation and it is the most used by the majority of practitioners.
We now have very good canal obturation using the Obtura II system.
The aim of this study was to assess the radiographic quality of root canal obturation provided by the postgraduate students in posterior teeth using nickel-titanium (NiTi) rotary files in a crown-down approach compared with stainless steel standard preparation technique.
The quality of the root canal obturation was confirmed by mesiodistal and buccolingual radiographic images (Dabi Atlante, Ribeirao Preto, Brazil), taken with Kodak E-Speed film (Kodak, Rochester, USA) and with settings of 10 mA, 60 kV, focus-film distance of 10 cm, and exposure time of 0.
Effectiveness of hand and rotary instrumentation for removing a new synthetic polymer-based root canal obturation material (Epiphany) during retreatment.
Quality of root canal obturation performed by senior undergraduate dental students.
Endodontic failures are most frequently associated with defective root canal obturation and the presence of bacteria in the root canal system.
The influence of the smear layer on the sealing ability of canal obturation.