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Its intended purpose was to expand under the pressure and obturate the barrel and increase muzzle velocity.
Gutta percha, used in endodontic treatment to obturate root canals.
It must be sized so that the projectile will swage or obturate upon firing to fill the bore.
Compare to obturate.
Tests have shown that steel-cased Wolf cases do not obturate sufficiently to form a good gas seal against the chamber when compared to brass-cased ammunition.
Speech bulbs and palatal lifts aid in velopharyngeal closure and do not obturate a fistula.
When shot, the skirt will obturate to fit the bore and provide a good seal, and engage the rifling, whereby imparting spin.
It is the predominant material used to obturate, or fill the empty space inside the root of a tooth after it has undergone endodontic therapy.
For other uses see Obturator An obturating ring is a ring of relatively soft material designed to obturate under pressure to form a seal.
Tissue or biofilm remnants along such un-instrumented recesses may lead to failure due to both inadequate disinfection and the inability to properly obturate the root-canal space.
Some of these guns have rifled barrels, but the hard, slightly undersized BBs don't swage or obturate to fit the barrel, so the rifling may not impart a significant spin.
Airguns generally use a slightly undersized projectile that is designed to obturate upon shooting so as to seal the bore, and engage the rifling; firearms have sufficient pressure to force a slightly oversized bullet to fit the bore in order to form a tight seal.
As designed by Minié, the bullet had a small iron plug in the base whose purpose was to drive forward the bullet and, under the pressure of powder gases, obturate the bullet to fill the hollow space and expand the lead skirting to grip the barrel's rifling.