Comparative evaluation of the 30-gauge dental needle.

The results of these tests demonstrated that aspiration through 30-gauge needles is possible, but since the flow rate is so diminished its clinical application is questionable. The evaluation of the physical properties of these needles proved them to be tough, durable, and suprisingly resistant to breakage, even under the most extreme manipulations and stresses. The insertion of needles into the plastic material clearly showed that the needles are always deflected toward the side without the bevel (the side that contains the point). Finally, the deposition patterns of the injected fluid in tissue have no relationship to the bevel.