Aspiration, before and during the injection of anaesthetic, is strongly recommmended by the conventional literature of dental surgery. The development of passive systems which depend on a “semi automatic” backward movement of the components of the cartridge made easier the process of aspiration. A well-balanced syringe which suits comfortably to the hands gives to the dentist good tactiles informations transferred from the tip of the needle to the fingertip of the syringe. This should be associated with user-friendly aspiration system. This two elements must be the reason of the choice of an injection instrument.
The syringe offers two simple ways to achieve easily the aspiration:
1. Aspiration is provided either by gentle releasing the pushing force on the piston- in this way the elastic membrane in the cartridge, previously deformed by the pushing, it comes back to its original shape ensuring an aspiration effect.
2. Or by pressing and releasing the thumb disk.
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