Dentsply Pharmaceutical's self-aspiration system was developed specifically to address this issue of aspirating during every injection. This system uses a specific syringe and an adapted cartridge bung with a cavity open at the plunger end.

The bungs rely on the elastic nature of a thin membrane at the end of the bung which distorts when pressure is applied. By releasing the pressure, the bung returns to its normal shape, which is sufficient to cause aspiration. The company claims that as no physical effort is required to cause aspiration, the needle tip is less likely to move.

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