Pain is the most common cause of dental anxiety,

Injecting effective local anesthesia is the most important pillar to alleviate pain.

In maxilla, palatal nerve blocks are most painful blocks as compare to infraorbital and posterior superior alveolar nerve blocks.

To overcome these pain of  injection many newer technologies have been developed like Accupal  and Dentalvibe .

These devices had certain disadvantages with respect to cost and portablility .

In order to overcome limitation newer device called vibraject was introduced for delivering local anesthesia.

Vibraject is small vibrating device which has control knob at its back that helps in vibrations and it makes a ’hum’ sound along with vibrations. It is attached to conventional syringe with the help of clip brackets which are autoclavable  which avoids cross contamination.

Its  mode of action is that,

vibraject causes vibrations once the control knob is rotated clockwise ,these vibrations are transferred to needle which mask the pain while needle insertion and solution deposition , moreover that it makes ’ Humm ’ sound which diverts patients mind .

 Its mechanism of action is based on Gate Control Theory,

In 1965, Ronald Melzack and Charles Patrick (Pat) Wall (Melzack and Wall 1965) proposed the Gate Control Theory of Pain.

There are nociceptors (pain fibers-small) and (touch,pressure and vibration) fibers-large ,  these fibers synapse in two different regions within the dorsal horn of the spinal cord: cells in the substantia gelatinosa and the “transmission” cells.

They proposed that the gate in the spinal cord is the substantia gelatinosa in the dorsal horn which modulates the transmission of sensory information from the primary afferent neurons to transmission cells in the spinal cord.

Large-fiber activity inhibits (or closes) the gate, whereas small-fiber activity facilitates (or opens) the gate.

This mechanism of action helps in alleviating pain .