A laboratory investigation of a new design of self-aspirating syringe

A new design of dental cartridge syringe which incorporates a double self-aspirating mechanism has been investigated under controlled conditions in the laboratory. The new design was compared to two self-aspirating syringes which have been available for some time, namely the Astra and Aspiject syringes. The new syringe aspirated as effectively as the Astra design and was better in this respect than the Aspiject. The method used to examine the syringes involved tests which might be of value in creating standards for dental local anesthetic cartridges.