Definition of "obturation" [ob•tu•ra•tion]

• The act of stopping up, or closing, an opening. (noun)
• The process of a bullet expanding under pressure to fit the bore of the firearm, or a cartridge case expanding under pressure to seal the chamber. (noun)

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• "The obturation is a modification of the De Bange system, proposed by Vavasseur."
• "This helps achieve "concentric obturation" of the slug, which is what engineers say when they mean that the slug expands to seal in the bore without becoming misshapen and off-centered."
• "Do you do primary tooth pulpectomy? what technique and obturation material do you use? is it possible to do post or core bulid-up?"